Amplifier Circuit Diagrams

HIGH COMMON MODE RESPONSE RATE INSTRUMENTATION AMPLIFIER SCHEMATIC CIRCUIT DIAGRAM

HIGH COMMON MODE RESPONSE RATE INSTRUMENTATION AMPLIFIER SCHEMATIC CIRCUIT DIAGRAM

In the circuit, a common mode response rate (CMRR) instrumentation amplifier example is given.

The common mode response ratio (CMRR) is the ability to reject any signal applied to both input terminals of an op amp when they are signaled with the same characteristics. This value equals the ratio of a signal applied to the phase-inverting and non-phase-shifting input to the output signal. The unit of CMRR is dB (decibell).

The rate of rejecting parasitic and noisy signals in common mode response rate instrumentation amplifiers is also great. In the circuit, inputs Vgr1 and Vr2 are applied to the non-phase-shifted inputs of the opamps.

It is possible to adjust the gain of the circuit by changing the value of resistor R3. The op-ampa, which works as a difference amplifier, is applied to the signals obtained from the first two op-amp outputs. The value of the output voltage of the power can be found by the equation Vccq = 100 (Vgr2-Vgrp1).

Example: in the given circuit, Vgr1 = 4 mV, Vgr2 = 5 mV. Accordingly, we find the value of the output voltage.

Solution: Vccs = 100. (Vgrs2-Vgrs1) = 100. (5-4) = 100 mV

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