Differential amplification circuit, control method and signal amplification equipment
A differential amplifier circuit and controller technology, applied in the direction of differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of increasing the complexity of the production process, large testing and adjustment costs, etc., to improve the common mode rejection ratio Effect
- Application Information
AI Technical Summary
Problems solved by technology
 like figure 1 As shown, this embodiment provides a differential amplifier circuit, which includes an operational amplifier, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first switch SW1A, a second switch SW1B, The third switch SW2A and the fourth switch SW2B; wherein, the resistance values of the first resistor R1 and the second resistor R2 are both within a first error range (for example: between -0.5 ohm and +0.5 ohm), the The resistance values of the third resistor R3 and the fourth resistor R4 are both within the second error range (eg, between -0.4 ohm and +0.4 ohm); the first error range may also be the same as the second error range.
 The first resistor R1 and the second resistor R2 are connected in series, and the connection point is connected to the negative input end of the operational amplifier; the other ends of the first resistor R1 and the second resistor R2 are respectively connected to the fixed end ...
 This embodiment provides a control method for a differential amplifier circuit as described above, which includes:
 The connected states of the first switch, the second switch, the third switch and the fourth switch are controlled so that the differential amplifier circuit is switched between the first state and the second state.
 like image 3 As shown, in the first state, the first switch is connected to the output terminal of the operational amplifier, the second switch is connected to the negative pole of the input signal, the third switch is connected to the reference input terminal, and the fourth switch is connected to the positive pole of the input signal;
 like Figure 4 As shown, in the second state, the first switch is connected to the negative terminal of the input signal, the second switch is connected to the output terminal of the operational amplifier, the third switch is connected to the positive terminal of the input signal, and...
 This embodiment provides a signal amplifying device, which includes the differential amplifying circuit as described above.
 Among them, signal amplification equipment such as instrumentation amplifier and so on.
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