CN217904365U - Single-power-supply operational amplifier circuit - Google Patents
Single-power-supply operational amplifier circuit Download PDFInfo
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- CN217904365U CN217904365U CN202221989496.6U CN202221989496U CN217904365U CN 217904365 U CN217904365 U CN 217904365U CN 202221989496 U CN202221989496 U CN 202221989496U CN 217904365 U CN217904365 U CN 217904365U
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Abstract
The utility model discloses a single power operational amplifier circuit belongs to measuring instrument technical field, include: an amplification input for receiving a signal and amplifying the received signal; one end of the bias voltage device is electrically connected with the amplification input device and is used for superposing bias voltage on the voltage from the amplification input device; the amplitude limiting circuit is electrically connected with the bias voltage device and is used for cutting the interference of the top or the bottom of the waveform of the output voltage of the bias voltage device; and the clamping circuit is connected with the amplitude limiting circuit and is used for fixing the received voltage signal on a specified voltage value and keeping the original waveform shape unchanged. The single-power-supply operational amplifier circuit in the embodiment can optimize the current lost in the circuit under the condition of different loads, so that the power consumption can be effectively saved.
Description
Technical Field
The utility model relates to a measuring instrument technical field specifically is a single power supply operational amplifier circuit.
Background
The operational amplifier circuit applied to the measuring instrument at present has single power supply and double power supply for power supply, the input and output voltages of the double power supply amplifier circuit can span positive and negative voltages, but basically has no rail-to-rail capability, namely, the input voltage range is positive and negative symmetrical and has a certain distance with the positive and negative power supply voltages, the output voltage range is positive and negative symmetrical and has a certain distance with the positive and negative power supplies, the single power supply operational amplifier circuit has better rail-to-rail capability, namely, the input and output voltage range is larger than the power supply voltage, the input can realize linear amplification from the negative power supply, and the circuit is simple.
The publication numbers are: CN214799419U discloses a single power supply operational amplifier circuit, which is configured as an amplification single circuit powered by a single power supply and configured to provide an input amplification signal, where another end of the amplification circuit is connected to a bias circuit, and after receiving a signal from the amplification circuit, a bias voltage can be superimposed on a first input end, and a bias voltage is superimposed on an input end of the single power supply operational amplifier, and the bias voltage has high precision, and does not affect the input impedance of the operational amplifier, so that the single power supply operational amplifier effectively amplifies an input ac signal.
However, the above-mentioned solution has a significant problem that when the circuit is used, if a small dc voltage is input to the input terminal of the operational amplifier, the dynamic range is limited, and even the output is saturated, which results in waste of power consumption.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a single power supply operational amplifier circuit to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a single power supply operational amplifier circuit comprising:
the amplifying input device is used for receiving signals and amplifying the received signals and consists of a power supply V1, a power supply V2, a resistor R4, a resistor R5, a resistor R6 and a capacitor; the cathode of the capacitor is grounded, the anode of the capacitor is connected with the power supply V2 in parallel through the resistor R4 to input voltage, and the anode of the capacitor is connected with the power supply V1 in series and then output from the output end of the capacitor;
one end of the bias voltage device is electrically connected with the amplification input device and is used for superposing bias voltage on the voltage from the amplification input device; the other end of the bias voltage is connected with an input circuit to play a role of filtering clutter, one end of the bias voltage is connected with a resistor R7 in series, and the other end of the bias voltage is grounded;
the amplitude limiting circuit is electrically connected with the bias voltage device and is used for cutting the interference of the top or the bottom of the waveform of the output voltage of the bias voltage device;
and the clamping circuit is connected with the amplitude limiting circuit and is used for fixing the received voltage signal on a specified voltage value and keeping the original waveform shape unchanged.
As the utility model discloses further scheme again: wherein, the proportion of the output voltage of the amplification inputter is 1.
As a further aspect of the present invention: the amplifying input device is connected with an external power supply, and the external power supply provides power for the amplifying input device.
As the utility model discloses further scheme again: the single-power-supply operational amplifier circuit further comprises a loop circuit coupled with the amplification input device, a resistor R1 is electrically connected between the loop circuit and the amplification input device, and the resistor R1 provides a ground loop for inputting bias voltage.
As the utility model discloses further scheme again: the loop circuit is further provided with a resistor R2 and a resistor R3, and the numerical value of the resistor R1 is equal to the parallel resistance value of the resistor R2 and the resistor R3.
As a further aspect of the present invention: the loop circuit further comprises a diode and a capacitor, and the diode and the capacitor are electrically connected.
Compared with the prior art, the beneficial effects of the utility model are that:
in the single-power-supply operational amplifier circuit in the embodiment, through the design of the amplification input device, the bias voltage, the amplitude limiting circuit and the clamping circuit, the current consumed in the circuit can be optimized under the condition of different loads by utilizing the synergistic effect of the parts, so that the power consumption is effectively saved.
Drawings
Fig. 1 is a schematic block diagram of a circuit according to the present invention;
fig. 2 is a schematic connection diagram of the clamp circuit according to the present invention;
fig. 3 is a schematic diagram of the middle loop circuit of the present invention.
The corresponding relationship between the reference numbers of the figures and the names of the components in the figures is as follows:
1. an amplification input device; 2. a bias voltage device; 3. a clipping circuit; 4. a clamping circuit.
Detailed Description
The invention is further elucidated below with reference to the figures and examples.
Referring to fig. 1 to 3, the present embodiment provides a single power supply operational amplifier circuit, which mainly comprises an amplification input unit 1, a bias voltage unit 2, a limiting circuit 3, and a clamping circuit 4, wherein:
an amplification inputter 1 for receiving a signal and amplifying the received signal;
and a bias voltage device 2, one end of which is electrically connected to the amplification input device 1, and is configured to superimpose a bias voltage on the voltage from the amplification input device 1, where the bias voltage is a voltage that should be set between the base and the emitter and between the collector and the base when the transistor in the transistor amplification circuit is in an amplification state. The high-voltage power supply comprises two power supplies V1 and V2, three resistors R4, R5 and R6 and a capacitor, wherein the cathode of the capacitor is grounded, the anode of the capacitor is connected with the power supply V2 in parallel through the resistor R4 to input voltage, and the anode of the capacitor is connected with the power supply V1 in series and then is output from the output end of the capacitor; the other end is connected with an input circuit to play a role of filtering clutter, one end of the bias voltage 2 is connected with the resistor R7 in series, and the other end is grounded.
The amplitude limiting circuit 3 is electrically connected with the bias voltage 2, and the amplitude limiting circuit 3 is used for cutting the interference on the top or the bottom of the waveform of the output voltage of the bias voltage 2; the limiter circuit 3 is also called as limiter or clipper, and can transform the waveform, for example, cut off the positive pulse in the output signal and only leave the negative pulse therein, and can also perform overvoltage protection, for example, when a strong output signal or interference may damage a component, the limiter circuit 3 can be connected in front of the component.
And the clamping circuit 4 is connected with the amplitude limiting circuit 3, and the clamping circuit 4 is used for fixing the received voltage signal on a specified voltage value and keeping the original waveform shape unchanged.
In this embodiment, the amplification input device 1 has an output voltage ratio of 1.
In addition, the single power supply operational amplifier circuit described in this embodiment is further provided with a loop circuit, the loop circuit is coupled to the amplification input unit 1, a resistor R1 is electrically connected between the loop circuit and the amplification input unit 1, and the resistor R1 provides a ground loop for the input bias voltage. In this embodiment, it is noted that the resistor R1 always generates some noise in the circuit, so a compromise is made between the input impedance of the circuit, the size of the input coupling capacitor and the noise caused by the resistor, and the resistance value of the resistor is typically 100000 Ω -1M Ω. In this embodiment, a resistor R2 and a resistor R3 are further disposed in the loop circuit, and the resistance of the resistor R1 is equal to the parallel resistance of the resistor R2 and the resistor R3; meanwhile, the loop circuit further comprises a diode and a capacitor, and the diode is electrically connected with the capacitor.
The above-mentioned, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A single power supply operational amplifier circuit, comprising:
the amplifying input device (1) is used for receiving signals and amplifying the received signals and comprises a power supply V1, a power supply V2, a resistor R4, a resistor R5, a resistor R6 and a capacitor; the cathode of the capacitor is grounded, the anode of the capacitor is connected with the power supply V2 in parallel through the resistor R4 to input voltage, and the anode of the capacitor is connected with the power supply V1 in series and then output from the output end of the capacitor;
the bias voltage device (2) has one end electrically connected with the amplification input device (1) and is used for superposing bias voltage on the voltage from the amplification input device (1); the other end of the bias voltage device (2) is connected with an input circuit to filter noise waves, one end of the bias voltage device is connected with a resistor R7 in series, and the other end of the bias voltage device is grounded;
the amplitude limiting circuit (3) is electrically connected with the bias voltage (2), and the amplitude limiting circuit (3) is used for cutting the interference of the top or the bottom of the waveform of the output voltage of the bias voltage (2);
and the clamping circuit (4) is connected with the amplitude limiting circuit (3), and the clamping circuit (4) is used for fixing the received voltage signal on a specified voltage value and keeping the original waveform shape unchanged.
2. The single power supply operational amplifier circuit according to claim 1, wherein the amplification input device (1) outputs a voltage ratio of 1.
3. The single-power-supply operational amplifier circuit according to claim 1, wherein an external power supply is connected to the amplification input device (1), and the external power supply provides power for the amplification input device (1).
4. The single-power-supply operational amplifier circuit according to claim 1, further comprising a loop circuit coupled to the amplification input device (1), wherein a resistor R1 is electrically connected between the loop circuit and the amplification input device (1), and the resistor R1 provides a ground loop for the input bias voltage.
5. The single-power-supply operational amplifier circuit as claimed in claim 4, wherein a resistor R2 and a resistor R3 are further disposed in the loop circuit, and the resistance of the resistor R1 is equal to the parallel resistance of the resistor R2 and the resistor R3.
6. The single power supply operational amplifier circuit as claimed in claim 4 or 5, wherein the loop circuit further comprises a diode and a capacitor, and the diode and the capacitor are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221989496.6U CN217904365U (en) | 2022-07-29 | 2022-07-29 | Single-power-supply operational amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221989496.6U CN217904365U (en) | 2022-07-29 | 2022-07-29 | Single-power-supply operational amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217904365U true CN217904365U (en) | 2022-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221989496.6U Active CN217904365U (en) | 2022-07-29 | 2022-07-29 | Single-power-supply operational amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217904365U (en) |
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2022
- 2022-07-29 CN CN202221989496.6U patent/CN217904365U/en active Active
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