Transcription of Chapter 11 Differential Amplifier Circuits
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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. Each type will have its output response illustrated in Fig. Common mode type would result zero output and Differential mode type would result high output. This shall mean the Amplifier has high common mode rejection ratio.
11 Differential Amplifier Circuits - 295 - and Vout2 = 2 V V out (d) out (c) − (11.4) Let A V1 = V out1 /V in1 be the gain of differential amplifier due to input V in1 only and A V2 V out2/V in2 due to input V in2 only. Then from superposition theorem, the output voltage V out is equal to V out = A V1 Vin1 + A V2 Vin2.After substituting V in1 and V in2 from equation (11.1) and (11.2), the ...
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