A High Speed Two Stage Operational Amplifier with High CMRR

A differential amplifier is actually a electronic amplifier which amplifies the difference between two input voltages and suppresses any voltage common to the two inputs. Differential type amplifier is a analog circuit in which there is two input terminal and one output terminal. The input is actually the difference between the value of two input terminals. The differential amplifier is a vast used circuit building block in analog integrated circuits, principally op-amps. The differential amplifier can be implemented with BJTs or MOSFETs. Here we have got high gain of 70 dB, slew rate of 119 V/μs and Gain Bandwidth of 30MHz.It was seen that two stage amplifier gives better amplification because of the multiplying factor. Here we have taken some specification based on which we derived the results theoretically and then simulated in the order to get the results. Here in our proposed circuit we have got very good CMRR of 72dB.