Derive equation of voltage gain, input resistance and output resistance of voltage divider based JFET amplifier.

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written 8.1 years ago by

abgharge • 260

modified 3.2 years ago by

pedsangini276 • 4.8k

Mumbai University > Electronics Engineering > Sem 4 > Discrete Electronic Circuits

Marks: 10M

Year: Dec 2016

discrete electronics

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written 8.1 years ago by

abgharge • 260

• modified 8.1 years ago

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Figure 1: Circuit Diagram of Common Source amplifier.

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

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Figure 2: Small signal equivalent circuit

Voltage Gain ( $A_V$ ):

$V_O = I_O * R_D$

But $I_O = - Ids$

$V_O = - Ids * R_D$ ....(1) …

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