Exercise: Fet Amplifiers

Questions for: Fet Amplifiers

The input resistance at the gate of a FET is extremely
A:
high.
B:
low.
C:
D:
Answer: A
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Refer to this figure. If C2 shorted, Vout would

A:
increase.
B:
decrease.
C:
remain the same.
D:
distort.
Answer: D
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Which of the following is (are) related to depletion-type MOSFETs?
A:
can be negative, zero, or positive.
B:
gm can be greater or smaller than gm0.
C:
ID can be larger than IDSS.
D:
All of the above
Answer: D
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Refer to this figure. The approximate value of Rin is

A:
100 M.
B:
1.5 k.
C:
3.3 k.
D:
48 M.
Answer: A
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Refer to this figure. If gm = 4000 mS and a signal of 75 mV rms is applied to the gate, calculate the p-p output voltage.

A:
990 mV
B:
1.13 V p-p
C:
2.8 V p-p
D:
990 V p-p
Answer: C
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