- 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 gm = 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. dVB/dID ) in KΩ offered by an N- channel MOSFET ‘M’ shown in fig., at a bias point of VB = 2 volts is _______.( Assume Kn=μn.Cox(W/L) = 40 μA/V2 and VT = 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 Vout in volts is _____
A. 4 B. 6 C. 8 D.
10
Ans : C

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