**The ac schematic of an NMOS common source stage is shown below, where part of the biasing circuit has been omitted for simplicity. For an N-channel MOSFET ‘M’, the transconductance g**_{m}= 1 mA/Volt, and body effect and Channel length modulation effect are to be neglected. Then the lower cutoff frequency in Hz of the circuit is approximately at _______.

A. 8 B. 32 C.
50 D. 200

Ans :

**A**

**The small signal resistance ( i.e. dV**_{B}/dI_{D}) in KÎ© offered by an N- channel MOSFET ‘M’ shown in fig., at a bias point of V_{B}= 2 volts is _______.( Assume K_{n}=Î¼_{n}.C_{ox}(W/L) = 40 Î¼A/V^{2}and V_{T}= 1 volt, and neglect body effect and channel length modulation effect. )

A. 12.5 B. 25 C.
50 D. 100

Ans :

**B**

**In the circuit shown below, assume ideal op-amps. Then V**_{out}in volts is _____

A. 4 B. 6 C. 8 D.
10

Ans :

**C**

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