JPH03162017A - Reception circuit - Google Patents
Reception circuitInfo
- Publication number
- JPH03162017A JPH03162017A JP30137889A JP30137889A JPH03162017A JP H03162017 A JPH03162017 A JP H03162017A JP 30137889 A JP30137889 A JP 30137889A JP 30137889 A JP30137889 A JP 30137889A JP H03162017 A JPH03162017 A JP H03162017A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- frequency amplifier
- intermediate frequency
- pass filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 239000000284 extract Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野Ｊ
この発明は各種の受信機に利用して低コストで高感度化
を達することができる受信回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application J This invention relates to a receiving circuit that can be used in various receivers to achieve high sensitivity at low cost.
Ｆ従来の技術」 第３図は従来の受信回路を示す。F. Conventional technology FIG. 3 shows a conventional receiving circuit.
受信同調回路ｌで周波数選択された受信号は必要に応し
て高周波増幅器２で増幅され周波数変換器３に供給され
る。The received signal whose frequency has been selected by the reception tuning circuit 1 is amplified by the high frequency amplifier 2 as necessary and supplied to the frequency converter 3.
周波数変換器３には局部発振器４から局部発振信号が与
えられ、その出力に受信信号の周波数と局部発振信号の
周波数の和と差の周波数を持つ信号を出力する。The frequency converter 3 is given a local oscillation signal from the local oscillator 4, and outputs a signal having a frequency that is the sum and difference of the frequency of the received signal and the frequency of the local oscillation signal.
帯域通過フィルタ５は周波数変換器３から出力される差
の周波数の信号を中間周波信号として取出し、その中間
周波信号を中間周波増幅器６に与え、増幅して出力する
。The bandpass filter 5 extracts the difference frequency signal output from the frequency converter 3 as an intermediate frequency signal, supplies the intermediate frequency signal to the intermediate frequency amplifier 6, amplifies it, and outputs it.
「発明が解決しようとする課題」
従来の受信回路において、高感度化をはかろうとすると
、高周波１１幅器２の利得を高めるか、或は中間周波増
幅器６の利得を高めることになる．増幅器２又は６の利
得を高めるためには能動素子の数を増すことになり、コ
ストの増加と電力消費量の増加をもたらす欠点が生じる
．
この発明の目的はコストの増加及び電力消費量の増加を
抑えて高感度化を達することができる受信回路を提供し
ようとするものである．「課題を解決するための手段」
この発明では受信帯域と中間周波帯域の双方に利ｊ３を
持つ高周波増幅器を用意し、この高周波増幅器に受信｛
３号を与えると共に、この高周波増幅器の出力側に高域
通過フィルタを設け、増幅された受イ３信号を高域ｉｉ
１過フィルタによって取出す．取出された受信信号を周
波数変換器に入力し、受信周波数より低い周波数を持つ
中間周波信号に変換する．この中間周波信号を高周波増
幅２＝に百人力し、中間周波信号を増幅させる．
高周波数増幅器の出力側には低域通過フィルタを接続し
、この低域通過フィルタによって中間周波信号を取出す
．
このようにこの発明の構成によれば一つの高周波堆幅器
を本来の高周波増幅器として利用する外に、中間周波増
幅器としても利用するので安価に構戒することができる
。また一つの増幅器を高周波増幅器と中間周波増幅器と
して共用するので電力消費量を少なくすることができる
．また他に簡単な高周波増幅器を増設するだけで容易に
高感度化を達することができる。``Problems to be Solved by the Invention'' In a conventional receiving circuit, if one attempts to increase the sensitivity, the gain of the high frequency amplifier 2 or the intermediate frequency amplifier 6 must be increased. In order to increase the gain of the amplifier 2 or 6, the number of active elements must be increased, which has the disadvantage of increasing cost and power consumption. The purpose of this invention is to provide a receiving circuit that can achieve high sensitivity while suppressing increases in cost and power consumption. "Means for Solving the Problem" In this invention, a high frequency amplifier that has utility in both the reception band and the intermediate frequency band is prepared, and this high frequency amplifier has a reception
3, and a high-pass filter is provided on the output side of this high-frequency amplifier, and the amplified received A3 signal is passed through the high-frequency
It is extracted through a 1-pass filter. The extracted received signal is input to a frequency converter and converted to an intermediate frequency signal with a frequency lower than the received frequency. This intermediate frequency signal is applied to high frequency amplification 2 to amplify the intermediate frequency signal. A low-pass filter is connected to the output side of the high-frequency amplifier, and the intermediate frequency signal is extracted by this low-pass filter. As described above, according to the configuration of the present invention, one high frequency amplifier can be used not only as an original high frequency amplifier but also as an intermediate frequency amplifier, so it can be constructed at low cost. Furthermore, since one amplifier is shared as both a high frequency amplifier and an intermediate frequency amplifier, power consumption can be reduced. In addition, high sensitivity can be easily achieved by simply adding a simple high-frequency amplifier.
「実施例」
第１図にこの発明の一実施例を示す。図中１は受信同調
回路、３は周波数変換器、４は局部発振器を示す点は従
来の説明と同しである．この発明においては受信帯域及
び中間周波帯域の双方に利得を持つ高周波増幅器１１を
設レナる。"Embodiment" FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a receiving tuning circuit, 3 is a frequency converter, and 4 is a local oscillator, which are the same as in the conventional explanation. In this invention, a high frequency amplifier 11 having gains in both the receiving band and the intermediate frequency band is provided.
この高周波増幅器１１に受信同調回路ｌで選択した受イ
ユ信号ＲＳを入力して増幅すると共に、増幅した受信信
号ＲＳを高域通過フィルタｌ２で取出す。The received signal RS selected by the receiving tuning circuit 1 is input to the high frequency amplifier 11 and amplified, and the amplified received signal RS is taken out by the high pass filter 12.
高域通過フィルタｌ２によって取出した受信信号ＲＳを
周波数変換器３に入力し、受信信号ＲＳの周波数より低
い周波数の中間周波信号に変換する。つまり周波数変換
器３の出力側に帯域通過フィルタ１３を設け、この帯域
通過フィルタｌ３によって受信信号の周波数と、局部発
振器４の周波数の差の周波数を持つ信号の中間周波信号
ＩＦとして取出し、この中間周波信号ＩＦを高周波増幅
器ｌ１に再人力する．
再人力された中間周波信号ＩＦはこの高周波増幅器ｌ１
で再度増幅され、出力側に設けた低域通過フィルタｌ４
によって取出され復調回路１５等に供給される．
受信信号ＲＳの周波数と、中間周波数とは一般に大きく
離れている場合が多い。例えばＦＭ放送では受信周波数
帯域の下限周波数が７５ＭＨｚ，中間周波数が１０．７
ＭＨｚであるからその倍率は約７倍程度である。The received signal RS extracted by the high-pass filter l2 is input to the frequency converter 3, and is converted into an intermediate frequency signal having a frequency lower than the frequency of the received signal RS. That is, a bandpass filter 13 is provided on the output side of the frequency converter 3, and this bandpass filter 13 extracts a signal having a frequency that is the difference between the frequency of the received signal and the frequency of the local oscillator 4 as an intermediate frequency signal IF. The frequency signal IF is re-powered to the high frequency amplifier l1. The regenerated intermediate frequency signal IF is transferred to this high frequency amplifier l1.
is amplified again by the low-pass filter l4 provided on the output side.
The signal is taken out by the demodulator 15 and supplied to the demodulator circuit 15, etc. Generally, the frequency of the received signal RS and the intermediate frequency are often far apart. For example, in FM broadcasting, the lower limit frequency of the receiving frequency band is 75 MHz, and the intermediate frequency is 10.7
Since it is MHz, the magnification is about 7 times.
従って高域通過フィルタｌ２と低域通過フィルタｌ４と
によって受信信号ＲＳと中間周波信号ＩＦとを容易に分
離して取出すことができ、復調回路１５に中間周波信号
ＩＦだけを与えることができる。Therefore, the received signal RS and the intermediate frequency signal IF can be easily separated and extracted by the high-pass filter l2 and the low-pass filter l4, and only the intermediate frequency signal IF can be provided to the demodulation circuit 15.
第２図はこの発明の変形実施例を示す．この例では前段
側に第１周波数変換器Ｉ６を設け、この第１周波数変換
器１６で予め第１周波数変換を行ない、この第１周波数
変換された第１中間周波信号ＩＦ．をこの発明による受
信回路２０に入力するように構威した場合を示す。従っ
てこの発明による受信回路２０に設けた周波数変換器３
は第２周波数変換器として動作し、帯域通過フィルタ１
３から第２中間周波信号ＴＦｔが得られる。Figure 2 shows a modified embodiment of this invention. In this example, a first frequency converter I6 is provided on the front stage side, the first frequency converter 16 performs first frequency conversion in advance, and the first frequency converted first intermediate frequency signal IF. A case is shown in which the signal is configured to be input to the receiving circuit 20 according to the present invention. Therefore, the frequency converter 3 provided in the receiving circuit 20 according to the invention
acts as a second frequency converter, and the bandpass filter 1
3, the second intermediate frequency signal TFt is obtained.
この第２中間周波信号ＩＦｘは高周波増幅器１１で再度
増幅されて低域通過フィルタ１４によって取出される。This second intermediate frequency signal IFx is amplified again by the high frequency amplifier 11 and extracted by the low pass filter 14.
尚第２図において１７は第１局部発振器、１８は第１中
間周波信号ＩＦ＋を取出すための帯域通過フィルタを示
す．
「発明の効果」
以上説明したように、この発明によれば一つの高周波増
幅器１１を受信信号を増幅する本来の高周波増幅器と中
間周波信号を増幅する中間周波増幅器とを兼ねて動作さ
せるから増幅用の能動素子を多用することなく高感度を
実現することができ従ってコストの増加を印えながら高
感度の受信機を横威することができる．また能動素子の
増加を抑えることができるから消費電力の小さい受信機
を得ることができる．よって電池駆動型に構成した場合
、電池の寿命を長くすることができる利点が得られる。In FIG. 2, reference numeral 17 indicates a first local oscillator, and reference numeral 18 indicates a band pass filter for extracting the first intermediate frequency signal IF+. "Effects of the Invention" As explained above, according to the present invention, one high frequency amplifier 11 is operated both as an original high frequency amplifier for amplifying a received signal and as an intermediate frequency amplifier for amplifying an intermediate frequency signal. It is possible to achieve high sensitivity without using many active elements, and therefore it is possible to use a high-sensitivity receiver while increasing the cost. Furthermore, since the increase in active elements can be suppressed, a receiver with low power consumption can be obtained. Therefore, when configured to be battery-driven, the advantage is that the battery life can be extended.
第１図はこの発明の一実施例を説明するためのブロソク
図、筆２図はこの発明の変形実施例を示すプロ・７ク図
、第３図は従来の技術を説明するためのブロック図であ
る．Fig. 1 is a block diagram for explaining an embodiment of this invention, Fig. 2 is a block diagram for explaining a modified embodiment of this invention, and Fig. 3 is a block diagram for explaining a conventional technique. It is.
Claims (1)
の高周波増幅器の出力側に接続され、受信信号を取出す
高域通過フィルタと、 Ｃ、この高域通過フィルタで取出した受信信号に局部発
信信号を加えて和と差の周波数 を持つ信号に変換する周波数変換器と、 Ｄ、この周波数変換器から出力される和と差の周波数を
持つ信号から差の周波数を持つ 信号を取出して上記高周波増幅器に再入力 するフィルタと、 Ｅ、上記高周波増幅器の出力側に接続され、上記差の周
波数を持つ信号を取出す低域通 過フィルタと、 によって構成した受信回路。(1) A: a high-frequency amplifier that amplifies the received signal; B: a high-pass filter that is connected to the output side of the high-frequency amplifier and takes out the received signal; and C: a local D. A frequency converter that adds the transmitted signal and converts it into a signal with the sum and difference frequencies; A receiving circuit comprising: a filter for re-inputting the signal into the high-frequency amplifier; and a low-pass filter connected to the output side of the high-frequency amplifier and extracting a signal having the difference frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30137889A JPH03162017A (en) | 1989-11-20 | 1989-11-20 | Reception circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30137889A JPH03162017A (en) | 1989-11-20 | 1989-11-20 | Reception circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03162017A true JPH03162017A (en) | 1991-07-12 |
Family
ID=17896156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30137889A Pending JPH03162017A (en) | 1989-11-20 | 1989-11-20 | Reception circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03162017A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6261548B2 (en) * | 1977-09-14 | 1987-12-22 | Chichibu Cement Kk |
-
1989
- 1989-11-20 JP JP30137889A patent/JPH03162017A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6261548B2 (en) * | 1977-09-14 | 1987-12-22 | Chichibu Cement Kk |
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