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Chapter 11 Differential Amplifier Circuits

- 293 - Chapter 11 Differential Amplifier Circuits _____ Introduction Differential Amplifier or diff-amp is a multi-transistor Amplifier . It is the fundamental building block of analog circuit. It is virtually formed the Differential Amplifier of the input part of an operational Amplifier . It is used to provide high voltage gain and high common mode rejection ratio. It has other characteristics such as very high input impedance, very low offset voltage and very low input bias current. Differential Amplifier can operate in two modes namely common mode and Differential mode.

If two input voltage are equal, the differential amplifier gives output voltage of almost zero volt. If two input voltages are not equal, the differential amplifier gives a high output voltage. Let’s define differential input voltage V in(d) as V in(d) = V in1 – V in2 and common-mode input voltage V in(c) = 2 Vin 1 +Vin 2. From these ...

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