An example of a common mode response rate (CMRR) instrumentation amplifier is given in the Circuit.
The common mode response rate (CMRR) is the ability to reject both of these op-amp’s input signals when both signals have the same characteristics. This value is equal to the ratio of a signal to the output signal, which is applied simultaneously to the phase transducer and the phase non-phase input. The unit of the CMRR is dB (desibell).
In the common mode response rate instrumentation amplifiers , the rate of discarding of the parasitic and noisy signals is also large. In the circuit, the V1 and V2 inputs are applied to the phase-in inputs of the opamps.
It is possible to adjust the gain of the circuit by changing the value of the resistor R3. The signals received from the first two op-amp outputs were applied to the op-ampa operating as a difference amplifier. The value of the output voltage of the circuit can be found by the equation Vc = 100.
Example: In the given circuit, Vgrş1 = 4 mV, Vgrş2 = 5 mV Find the value of the output voltage accordingly.
Solution: V1k = 100. (V1S2-V1S1) = 100.