JP6476470B2 - Wireless communication apparatus and impedance correction method - Google Patents

Description

  The present invention relates to a wireless communication apparatus and an impedance correction method.

  Conventionally, an antenna is provided in a wireless communication apparatus such as a mobile phone. The antenna may be built in the housing of the wireless communication device, and the communication performance of the antenna may deteriorate depending on the position of the user's hand holding the wireless communication device. That is, if there are objects such as a human body or metal around the antenna, impedance matching may not be achieved due to interference from these objects.

  In view of this, it has been considered to adjust the impedance characteristics of the antenna and maintain the impedance matching in an optimum state when the impedance varies. The matching circuit for adjusting the impedance characteristic as described above may be provided, for example, in the vicinity of the antenna, or may be provided at the output stage of an amplifier that amplifies the transmission signal.

JP 2000-13276 A Japanese Patent Laid-Open No. 11-136157 Japanese Patent Laid-Open No. 10-256930 JP 2001-308739 A

  By the way, a wireless communication device may perform communication with different frequencies for transmission and reception, and even when impedance matching is optimal in one frequency, impedance matching is not necessarily optimal in the other frequency. Not necessarily. For this reason, it is conceivable to adjust the impedance related to transmission by a matching circuit provided at the output stage of an amplifier that amplifies the transmission signal, and adjust the impedance related to reception by a matching circuit provided in the immediate vicinity of the antenna.

  However, when the impedance is adjusted by the matching circuit corresponding to each transmission / reception, it takes a long time to make the impedance matching an optimum state, and there is a problem that the power consumption increases. That is, for example, when the impedance is adjusted by the matching circuit for transmission after the impedance is adjusted by the matching circuit for reception, the transmission and reception are adjusted independently, and the adjustment time becomes long. While the impedance matching in transmission is not optimal, the current consumption of the amplifier may increase, and the power consumption of the wireless communication device increases.

  The disclosed technology has been made in view of the above points, and an object thereof is to provide a wireless communication device and an impedance correction method capable of reducing impedance adjustment time and suppressing increase in power consumption. .

  In one aspect, a wireless communication device disclosed in the present application is provided with a first correction unit that corrects impedance related to reception, an amplifier that amplifies a transmission signal, and an output stage of the amplifier, and corrects impedance related to transmission. A second correction unit, a memory that stores a correspondence relationship between a first correction amount of impedance related to reception and a second correction amount of impedance related to transmission, and a processor connected to the memory, the processor Sets a first correction amount in the first correction unit, refers to the memory, and sets a second correction amount corresponding to the first correction amount set in the first correction unit to the second correction unit. A process of adjusting and adjusting the second correction amount set in the second correction unit is executed based on the consumption current of the amplifier.

  According to one aspect of the wireless communication device and the impedance correction method disclosed in the present application, it is possible to shorten the impedance adjustment time and to suppress an increase in power consumption.

FIG. 1 is a block diagram illustrating a configuration of a wireless communication apparatus according to an embodiment. FIG. 2 is a diagram illustrating a specific example of the correction amount table. FIG. 3 is a block diagram illustrating functions of the BB processor according to the embodiment. FIG. 4 is a flowchart showing the correction setting process according to the embodiment. FIG. 5 is a flowchart showing the first correction amount determination process according to the embodiment. FIG. 6 is a flowchart showing the determination process of the second correction amount according to the embodiment.

  Hereinafter, an embodiment of a wireless communication apparatus and an impedance correction method disclosed in the present application will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

  FIG. 1 is a block diagram illustrating a configuration of a wireless communication device 100 according to an embodiment. A wireless communication apparatus 100 illustrated in FIG. 1 includes a display 101, a touch panel 102, a speaker 103, a microphone 104, and an application processor (hereinafter abbreviated as “AP processor”) 105. The wireless communication apparatus 100 includes a baseband processor (hereinafter abbreviated as “BB processor”) 106, a power supply circuit 109, a memory 115, and a wireless circuit. The wireless circuit includes a modulation unit 107, a power amplifier 108, an impedance correction unit 110, a duplexer 111, an impedance correction unit 112, a low noise amplifier 113, and a demodulation unit 114.

  The display 101 includes a liquid crystal module, for example, and displays various information according to control by the AP processor 105.

  The touch panel 102 is, for example, a capacitive touch panel that is disposed so as to overlap with the display 101, and detects contact by the user by detecting a change in capacitance. Then, the touch panel 102 notifies the AP processor 105 of the detected touch position coordinates.

  The speaker 103 outputs various audio information according to control by the AP processor 105.

  The microphone 104 acquires voice information such as voice uttered by the user, for example, and outputs the acquired voice information to the AP processor 105.

  The AP processor 105 includes, for example, a central processing unit (CPU), a digital signal processor (DSP), or a field programmable gate array (FPGA), and executes an application. Then, the AP processor 105 controls the display 101, the touch panel 102, the speaker 103, the microphone 104, and the like according to application processing. In addition, the AP processor 105 acquires received data from the BB processor 106 and executes processing using the received data, or outputs transmission data generated as a result of the processing to the BB processor 106.

  The BB processor 106 includes, for example, a CPU, a DSP, or an FPGA, performs predetermined baseband processing such as encoding and digital modulation on transmission data output from the AP processor 105, and outputs the result to the modulation unit 107. Further, the BB processor 106 performs predetermined baseband processing such as digital demodulation and decoding on the reception data output from the demodulation unit 114 and outputs the result to the AP processor 105.

  Further, the BB processor 106 determines the first correction amount of impedance so that the impedance matching at the time of reception is in an optimal state, and sets the second correction amount of impedance so that the impedance matching at the time of transmission is in an optimal state. decide. That is, the BB processor 106 determines the first correction amount set in the impedance correction unit 112 and then determines the second correction amount set in the impedance correction unit 110. At this time, the BB processor 106 refers to the memory 115 after determining the first correction amount, acquires the initial value of the second correction amount corresponding to the determined first correction amount, and adjusts the second correction amount. Run. The determination process of the first correction amount and the second correction amount by the BB processor 106 will be described in detail later.

  Modulation section 107 performs D / A (Digital / Analogue) conversion on the transmission data output from BB processor 106 and then upconverts it to a radio frequency.

  The power amplifier 108 amplifies transmission data using the current supplied from the power supply circuit 109. The current consumed by the power amplifier 108 changes according to the impedance at the output stage of the power amplifier 108.

  The power supply circuit 109 supplies current to the power amplifier 108, measures the current consumed by the power amplifier 108, and notifies the BB processor 106 of the measurement result.

  The impedance correction unit 110 corrects the impedance at the output stage of the power amplifier 108 in accordance with an instruction from the BB processor 106. That is, the impedance correction unit 110 sets the second correction amount instructed from the BB processor 106 and corrects the impedance related to transmission.

  The duplexer 111 transmits the transmission data via the impedance correction unit 112 and the antenna, and outputs the reception data received by the antenna to the low noise amplifier 113.

  The impedance correction unit 112 corrects the impedance in the immediate vicinity of the antenna in accordance with an instruction from the BB processor 106. That is, the impedance correction unit 112 sets the first correction amount instructed from the BB processor 106 and corrects the impedance related to reception.

  The low noise amplifier 113 amplifies received data with low noise. Then, the low noise amplifier 113 outputs the amplified reception data to the demodulation unit 114.

  The demodulator 114 down-converts the reception data output from the low noise amplifier 113 to a baseband frequency or an intermediate frequency, and then performs A / D (Analogue / Digital) conversion.

  The memory 115 stores various information used for processing executed by the BB processor 106. Specifically, the memory 115 stores in advance a correction amount table indicating a correspondence relationship between a first correction amount set in the impedance correction unit 112 and a second correction amount set in the impedance correction unit 110, for example.

FIG. 2 is a diagram illustrating a specific example of the correction amount table. As shown in FIG. 2, the correction amount table stores first correction amounts A _{m to An} (m is a negative integer, n is a positive integer) and corresponding second correction amounts B _{m to} B _n. ing. The first correction amount is an impedance correction amount related to reception set in the impedance correction unit 112, and is arranged in the correction amount table in ascending order of values, for example. The correction amount table stores a second correction amount for minimizing the current consumption of the power amplifier 108 when each of the first correction amounts is set in the impedance correction unit 112. In the correction amount table, even if the first correction amounts are arranged in ascending order of values, the second correction amounts are not necessarily arranged in order of increasing values.

Correspondence between such a first correction amount and the second correction amount, for example, in prototype wireless communication device, the optimum second correction amount B _m in the case of setting the first correction amount A _m to A _n of each ˜B _n is obtained by actual measurement. Therefore, according to the correction amount table shown in FIG. 2, for example, when the first correction amount A ₀ is set in the impedance correction unit 112, the prototype of the wireless communication apparatus sets the second correction amount B ₀ in the impedance correction unit 110. It is shown that the current consumption of the power amplifier 108 is minimized by setting.

  Next, functions of the BB processor 106 according to the embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating functions of the BB processor 106 according to an embodiment. In FIG. 3, blocks related to functions such as encoding, digital modulation, and distortion compensation provided in a normal BB processor are omitted. As illustrated in FIG. 3, the BB processor 106 includes a first correction amount setting unit 201, a reception level determination unit 202, a second correction amount setting unit 203, and a current consumption determination unit 204.

  The first correction amount setting unit 201 sets one of the first correction amounts stored in the correction amount table in the impedance correction unit 112 as an initial value. The first correction amount setting unit 201 sequentially changes the first correction amount set in the impedance correction unit 112 in accordance with an instruction from the reception level determination unit 202. The first correction amount setting unit 201 finally sets the first correction amount that maximizes the reception level in the impedance correction unit 112 according to the determination result of the reception level determination unit 202.

The reception level determination unit 202 determines the suitability of the first correction amount set in the impedance correction unit 112 using the reception level of the reception data down-converted and A / D converted by the demodulation unit 114. Specifically, when the reception level determination unit 202 acquires the reception level when the initial value of the first correction amount is set in the impedance correction unit 112, the reception level determination unit 202 performs the first correction on the first correction amount setting unit 201. An instruction is given to change the amount to a first correction amount that differs by one step. That is, for example, when the first correction amount A _{0 in} the correction amount table shown in FIG. 2 is set as an initial value, an instruction is given to set the first correction amount A ₁ after obtaining the reception level.

The reception level determination unit 202 compares the reception level when the first correction amount A ₀ is set with the reception level when the first correction amount A ₁ is set, and the first correction amount A ₁ is If the reception level at the time of the set is large, the first correction amount setting unit 201, an instruction to set the first correction amount a _2. On the other hand, if the reception level when the first correction amount A ₀ is set is large, the reception level determination unit 202 sets the first correction amount A ₋₁ for the first correction amount setting unit 201. To instruct.

  In this way, the reception level determination unit 202 compares the reception levels when the initial value and the first correction amount different from each other are set, and changes the first correction amount in the direction of increasing the reception level. Then, the reception level determination unit 202 determines the first correction amount that maximizes the reception level by repeating the change of the first correction amount and the comparison of the reception levels.

  The second correction amount setting unit 203, when the first correction amount that maximizes the reception level is set in the impedance correction unit 112 by the first correction amount setting unit 201, the second correction amount corresponding to the first correction amount. Is obtained from the correction amount table stored in the memory 115. Then, the second correction amount setting unit 203 sets the acquired second correction amount in the impedance correction unit 110 as an initial value. The second correction amount setting unit 203 sequentially changes the second correction amount set in the impedance correction unit 110 in accordance with an instruction from the current consumption determination unit 204. The second correction amount setting unit 203 finally sets the second correction amount that minimizes the current consumption in the impedance correction unit 110 according to the determination result of the current consumption determination unit 204.

The consumption current determination unit 204 determines the suitability of the second correction amount set in the impedance correction unit 110 using the consumption current of the power amplifier 108 measured by the power supply circuit 109. Specifically, when the current consumption determination unit 204 acquires the current consumption of the power amplifier 108 when the initial value of the second correction amount is set in the impedance correction unit 110, the current consumption determination unit 204 determines the second correction amount setting unit 203 The second correction amount is instructed to be changed to a second correction amount that is different by one step. That is, for example, when the second correction amount B _{0 in} the correction amount table shown in FIG. 2 is set as an initial value, an instruction is given to set the second correction amount B ₁ after acquiring the current consumption.

The consumption current determination unit 204 compares the consumption current when the second correction amount B ₀ is set with the consumption current when the second correction amount B ₁ is set, and the second correction amount B ₁ is If the current consumption when the set is small, the second correction amount setting unit 203, an instruction to set the second correction amount B _2. On the other hand, the current consumption determination unit 204 sets the second correction amount B ₋₁ for the second correction amount setting unit 203 when the current consumption when the second correction amount B ₀ is set is small. To instruct.

  In this way, the current consumption determination unit 204 compares the current consumption when the initial value and the second correction amount different from each other are set, and changes the second correction amount in the direction of decreasing the current consumption. Then, the consumption current determination unit 204 determines the second correction amount that minimizes the consumption current by repeatedly changing the second correction amount and comparing the consumption current.

  Next, correction setting processing in the wireless communication apparatus 100 configured as described above will be described with reference to the flowcharts shown in FIGS. FIG. 4 is a flowchart showing the correction setting process according to the embodiment, and FIGS. 5 and 6 are detailed flowcharts of the processes for determining the first correction amount and the second correction amount, respectively.

  The correction setting process is mainly executed by the BB processor 106. The correction setting process may be executed periodically, for example, at a predetermined period, or may be executed when an impedance variation accompanying the approach of a human body or metal is detected. When the correction setting process is started, the first correction amount setting unit 201 sequentially sets different first correction amounts in the correction amount table in the impedance correction unit 112 (step S101). The reception level determination unit 202 determines whether or not the reception level is maximized (step S102). While the reception level is not maximized (No in step S102), the impedance correction unit 112 sets the first level. One correction amount is sequentially changed.

  On the other hand, when the first correction amount that maximizes the reception level is determined (step S102 Yes), the first correction amount setting unit 201 sets the corresponding first correction amount in the impedance correction unit 112. Thereby, the first correction amount of the impedance related to reception is set to an optimum state. Further, the second correction amount setting unit 203 refers to the correction amount table, and acquires the second correction amount corresponding to the first correction amount that maximizes the reception level (step S103). The second correction amount acquired here is a correction amount that minimizes the current consumption of the power amplifier 108 in the prototype of the wireless communication apparatus. For this reason, there is a high possibility that the current consumption of the power amplifier 108 of the wireless communication apparatus 100 is also minimized by the correction amount close to the acquired second correction amount.

  Accordingly, the second correction amount setting unit 203 sequentially sets different second correction amounts in the impedance correction unit 110 step by step using the acquired second correction amount as an initial value (step S104). Then, the current consumption determination unit 204 determines whether or not the current consumption of the power amplifier 108 has become the minimum (step S105). While the current consumption is not the minimum (step S105 No), the impedance correction unit 110 receives the current consumption. The set second correction amount is sequentially changed. When the second correction amount that minimizes the current consumption is determined (Yes in step S105), the second correction amount setting unit 203 sets the corresponding second correction amount in the impedance correction unit 110. As a result, the second correction amount of impedance related to transmission is set to an optimum state.

  Next, the determination process of the first correction amount of the impedance related to reception will be described in more detail with reference to FIG. The first correction amount determination process is mainly executed by the first correction amount setting unit 201 and the reception level determination unit 202.

First, the parameter k for specifying the first correction amount in the correction amount table is initialized to 0 (step S201). As shown in FIG. 2, in the correction amount table, the first correction amount A ₀ is the central value in the vicinity of the first correction amount A _m to A _n arranged in the order value is small. Therefore, when the parameter k is initialized to 0, the first correction amount setting unit 201 sets the first correction amount A ₀ as the initial value of the first correction amount in the impedance correction unit 112 (step S202). . Then, the reception level RSSI ₀ in the state where the first correction amount A ₀ is set is measured (step S203) and acquired by the reception level determination unit 202.

When the reception level RSSI ₀ is acquired by the reception level determination unit 202, the first correction amount setting unit 201 sets the first correction amount A _{k + 1} in the impedance correction unit 112 (step S204). That is, here, the first correction amount A ₁ is set in the impedance correction unit 112. Then, the reception level RSSI ₁ in a state where the first correction amount A ₁ is set is measured (step S205) and acquired by the reception level determination unit 202.

The reception level RSSI ₀ and the reception level RSSI ₁ are compared in magnitude by the reception level determination unit 202 (step S206). If the reception level RSSI ₁ is larger as a result of this comparison (Yes at step S206), the reception correction level is increased by increasing the first correction amount, and therefore the first correction amount is further increased. That is, the parameter k is incremented by 1 (step S207), and the first correction amount setting unit 201 sets the first correction amount A _{k + 1} in the impedance correction unit 112 (step S204). That is, here, the first correction amount A ₂ is set in the impedance correction unit 112. Then, the reception level RSSI ₂ in a state where the first correction amount A ₂ is set is measured (step S205) and acquired by the reception level determination unit 202.

And while than the reception level RSSI _k larger reception level RSSI _{k + 1,} the parameter k is incremented by 1, the reception level RSSI _k reception level RSSI _{k + 1} at the timing when the maximum or less reception level RSSI _k (Step S206 No). Therefore, the reception level determining unit 202, the parameter k is determined whether remains zero initial values (step S208), unless the parameter k is 0 (step S208No), the first correction amount A _k It is determined to maximize the reception level (step S213).

On the other hand, when the parameter k is 0 at the initial value and the reception level RSSI _k is larger (No at Step S206), the reception level determination unit 202 determines that the parameter k remains at the initial value 0. (Step S208 Yes). In this case, since the reception level is reduced by increasing the first correction amount, the first correction amount is made smaller than the initial value. That is, the first correction amount setting unit 201 sets the first correction amount A _k−1 in the impedance correction unit 112 (step S209). That is, here, the first correction amount A ₋₁ is set in the impedance correction unit 112. Then, the reception level RSSI ₋₁ in a state where the first correction amount A ₋₁ is set is measured (step S210) and is acquired by the reception level determination unit 202.

The reception level RSSI ₀ and the reception level RSSI ₋₁ are compared in magnitude by the reception level determination unit 202 (step S211). If the reception level RSSI ₋₁ is larger as a result of this comparison (Yes at step S211), the reception level is increased by reducing the first correction amount, and therefore the first correction amount is further reduced. That is, the parameter k is decremented by 1 (step S212), and the first correction amount setting unit 201 sets the first correction amount A _k-1 in the impedance correction unit 112 (step S209). That is, here, the first correction amount A ₋₂ is set in the impedance correction unit 112. Then, the reception level RSSI _-2 in a state where the first correction amount A _-2 is set is measured (step S210) and acquired by the reception level determination unit 202.

And while than the reception level RSSI _k larger reception level RSSI _k-1, the parameter k is decremented by 1, the reception level RSSI _k reception level RSSI _k-1 at the timing when the maximum or less reception level RSSI _k (Step S211 No). Therefore, the reception level determination unit 202 determines that the first correction amount _Ak is the maximum reception level (step S213).

When the parameter k is the initial value 0, the reception level RSSI _{k + 1} is equal to or lower than the reception level RSSI _k (No in step S206), and the reception level RSSI _k-1 is equal to or lower than the reception level RSSI _k. (step S211No), the first correction amount a ₀ is the correction amount that maximizes the reception level.

Thus, the first correction amount A ₀ in the vicinity of the center of the first correction amount A _m to A _n arranged in the order value is less in the correction amount table as the initial value, while changing the first correction amount by one step A first correction amount that maximizes the reception level is determined. For this reason, the 1st correction amount which optimizes the impedance concerning reception can be determined in a short time.

  Next, the determination process of the second correction amount of the impedance related to transmission will be described in more detail with reference to FIG. The second correction amount determination process is mainly executed by the second correction amount setting unit 203 and the current consumption determination unit 204.

First the correction amount A _k is determined to maximize the reception level by the first correction amount setting unit 201, the correction amount table stored in the memory 115 is referred to by the second correction amount setting unit 203. Then, the second correction amount setting unit 203 obtains the second correction amount B _j corresponding to the first correction amount A _k from the correction amount table, and sets it in the impedance correction unit 110 (step S301). Second correction amount B _j corresponding to the first correction amount A _k in the correction amount table is a value close to the second correction amount of the current consumption of the power amplifier 108 to a minimum. Therefore, the second correction amount B _j is set in the impedance correction unit 110 as an initial value.

When the second correction amount B _j is set, the current consumption I _j of the power amplifier 108 in a state where the second correction amount B _j is set is measured by the power supply circuit 109 (step S302), and the current consumption determination unit 204 is notified.

When the consumption current I _j is acquired by the consumption current determination unit 204, the second correction amount setting unit 203 sets the second correction amount B _{j + 1} in the impedance correction unit 110 (step S303). Then, the consumption current I _{j + 1} in the state where the second correction amount B _{j + 1} is set is measured (step S304) and acquired by the consumption current determination unit 204.

The consumption current I _j and the consumption current I _{j + 1} are compared in magnitude by the consumption current determination unit 204 (step S305). If the current consumption I _{j + 1} is smaller as a result of the comparison (Yes in step S305), the current consumption is reduced by changing the second correction amount downward in the correction amount table shown in FIG. Therefore, the second correction amount is further changed to the downward direction. That is, the parameter j is incremented by 1 (step S306), and the second correction amount setting unit 203 sets a new second correction amount B _{j + 1} in the impedance correction unit 110 (step S303). Then, the consumption current I _{j + 1} in a state where the new second correction amount B _{j + 1} is set is measured (step S304) and acquired by the reception level determination unit 202.

Then, while the consumption current I consumed current I _{j + 1} is smaller than _j, the parameters j is incremented by 1, the consumed current I _{j + 1} at the timing when the consumption current I _j is minimized or consumed current I _j (Step S305 No). Therefore, the current consumption determination unit 204 determines whether or not the parameter j remains the initial value (step S307), and if the parameter j has changed from the initial value (step S307 No), the second correction amount B _j Is determined to minimize current consumption (step S312).

On the other hand, when the parameter j is in the initial value state and the current consumption I _j is larger (No in step S305), the current consumption determination unit 204 determines that the parameter j remains the initial value (step S307 Yes). ). In this case, since the current consumption is increased by changing the second correction amount in the downward direction in the correction amount table shown in FIG. 2, the second correction amount in the upward direction in the correction amount table shown in FIG. To change. That is, the second correction amount setting unit 203 sets the second correction amount B _j−1 in the impedance correction unit 110 (step S308). Then, the consumption current I _j-1 in a state where the second correction amount B _j-1 is set is measured (step S309) and acquired by the consumption current determination unit 204.

The consumption current I _j and the consumption current I _j-1 are compared in magnitude by the consumption current determination unit 204 (step S310). As a result of this comparison, if the current consumption I _j-1 is smaller (step S310 Yes), the current consumption is reduced by changing the second correction amount upward in the correction amount table shown in FIG. Therefore, the second correction amount is further changed to the upward direction. That is, the parameter j is decremented by 1 (step S311), and the second correction amount setting unit 203 sets a new second correction amount B _j-1 in the impedance correction unit 110 (step S308). Then, the consumption current I _j-1 in a state where the new second correction amount B _j-1 is set is measured (step S309) and acquired by the consumption current determination unit 204.

Then, while the consumption current I consumed current I _j-1 is less than _j, the parameters j is decremented by 1, the consumed current I _j-1 at the timing when the consumption current I _j is minimized or consumed current I _j (Step S310 No). Therefore, the current consumption determination unit 204 determines that the second correction amount B _j minimizes the current consumption of the power amplifier 108 (step S312).

Incidentally, in the state of the parameter j is the initial value, the consumption current I _{j + 1} is not less consumption current I _j or if it is (step S305No), and the consumption current I _j-1 also consumed current I _j or more (step S310No), the second correction amount B _j of the initial value is the correction amount that minimizes the current consumption.

As described above, the second correction amount _Bj corresponding to the optimum first correction amount A _k in the correction amount table is set as the initial value, and the second correction that minimizes the current consumption while changing the second correction amount step by step. The amount is determined. For this reason, it is possible to determine the second correction amount that minimizes the current consumption using the second correction amount that is close to the optimum as an initial value, and to determine the second correction amount that optimizes the impedance related to transmission in a short time. be able to. As a result, the adjustment time of the second correction amount for increasing the current consumption in the power amplifier 108 can be shortened, and an increase in power consumption can be suppressed.

  As described above, according to the present embodiment, after the first correction amount of the impedance related to reception is optimally adjusted, the second correction amount corresponding to the first correction amount is acquired from the correction amount table, The initial value at the time of adjusting the second correction amount of the impedance related to transmission is used. For this reason, it is possible to adjust the second correction amount using the second correction amount that is close to the optimum as an initial value, and it is possible to shorten the impedance adjustment time and suppress an increase in power consumption.

  In the above embodiment, the second correction amount is changed until the current consumption of the power amplifier 108 is minimized. However, the second correction amount is not necessarily adjusted so as to minimize the current consumption. Also good. That is, for example, when the current consumption of the power amplifier 108 becomes a predetermined threshold value or less, the second correction amount set in the impedance correction unit 110 at that time may be used as the final second correction amount.

  In the above embodiment, the second correction amount is changed downward or upward in the correction amount table shown in FIG. 2, but the change of the second correction amount is not limited to this. Specifically, for example, the second correction amount that minimizes the current consumption of the power amplifier 108 can be determined while increasing or decreasing the second correction amount by a predetermined value.

  Furthermore, the correction setting process in the above-described embodiment can be described as a program executable by a computer. In this case, this program can be stored in a computer-readable recording medium and introduced into the computer. Examples of the computer-readable recording medium include a portable recording medium such as a CD-ROM, a DVD disk, and a USB memory, and a semiconductor memory such as a flash memory.

DESCRIPTION OF SYMBOLS 101 Display 102 Touch panel 103 Speaker 104 Microphone 105 AP processor 106 BB processor 107 Modulation part 108 Power amplifier 109 Power supply circuit 110, 112 Impedance correction part 111 Duplexer 113 Low noise amplifier 114 Demodulation part 115 Memory 201 1st correction amount setting part 202 Reception level determination Unit 203 second correction amount setting unit 204 current consumption determination unit

Claims (7)

A first correction unit for correcting the impedance related to reception;
An amplifier for amplifying the transmission signal;
A second correction unit that is provided in an output stage of the amplifier and corrects an impedance related to transmission;
A memory that stores a correspondence relationship between a first correction amount of impedance related to reception and a second correction amount of impedance related to transmission;
A processor connected to the memory;
The processor is
A first correction amount is set in the first correction unit;
With reference to the memory, a second correction amount corresponding to the first correction amount set in the first correction unit is set in the second correction unit,
A wireless communication apparatus that performs a process of adjusting a second correction amount set in the second correction unit based on a current consumption of the amplifier. The processing to be set in the first correction unit is
The wireless communication apparatus according to claim 1, wherein a first correction amount that maximizes a reception level is set in the first correction unit. The adjustment process is
The wireless communication apparatus according to claim 1, wherein the second correction amount is adjusted so that a current consumption of the amplifier is minimized. The adjustment process is
The radio communication apparatus according to claim 1, wherein the second correction amount is adjusted so that a current consumption of the amplifier is equal to or less than a predetermined threshold. The memory is
A correspondence relationship obtained by actual measurement using a prototype of a wireless communication device, wherein a plurality of first correction amounts and a second correction amount that minimizes current consumption of the amplifier when each of the first correction amounts is set; The wireless communication apparatus according to claim 1, wherein the correspondence relationship is stored. A first correction amount for correcting the impedance related to reception is set in the first correction unit provided in the wireless communication device,
A second correction amount that is stored in advance corresponding to the set first correction amount and corrects the impedance related to transmission is acquired,
The acquired second correction amount is set in a second correction unit provided in the wireless communication device,
An impedance correction method comprising: adjusting a second correction amount set in the second correction unit based on a current consumption of an amplifier that amplifies a transmission signal transmitted by the wireless communication device. An impedance correction program executed by a computer, the computer
A first correction amount for correcting the impedance related to reception is set in the first correction unit provided in the wireless communication device,
A second correction amount that is stored in advance corresponding to the set first correction amount and corrects the impedance related to transmission is acquired,
The acquired second correction amount is set in a second correction unit provided in the wireless communication device,
An impedance correction program for executing a process of adjusting a second correction amount set in the second correction unit based on a consumption current of an amplifier that amplifies a transmission signal transmitted by the wireless communication device.

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