Derive expression for overall voltage gain, Zi and Zo for two stage (CS-CS) amplifier.

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written 8.1 years ago by

abgharge • 260

modified 2.5 years ago by

yashbeer ★ 11k

discrete electronics

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written 8.1 years ago by

abgharge • 260

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Figure 1 : Circuit Diagram of CS-CS Amplifier

At mid frequency all connected capacitors acts as short circuit. Hence AC equivalent using JFET becomes,

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Figure 2 : AC equivalent circuit

Av (Voltage Gain) :

Av2 = $\frac{Vo}{Vo1}$

Vo= Io Rd2 …..(1)

Io= $\frac{-gmVgs2×rd}{rd+Rd2}$ ……..(2) by CDR

Substitute equation (2) in …

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