Question

In a MOSFET operating in the saturation region, the channel length modulation effect causes 
1. An increase in the gate – source capacitance 
2. A decrease in the output resistance 
3. A decrease in the transconductance 
4. A decrease in the unity – gain cut – off frequency 

Answer 1

Correct Answer - Option 2 : A decrease in the output resistance 

For a MOSFET operating in saturation region the channel length modulation effect causes a decrease in output resistance. The drain characteristics becomes less flat.

Ideally drain characteristics is flat which implies infinite impedance

Due to channel length modulation early voltage is introduced which gives finite output resistance