Exercise: Fet Amplifiers

Questions for: Fet Amplifiers

Refer to this figure. If VGS = –6 V, calculate the value of RS that will provide this value.

A:
2.2 k
B:
1.2 k
C:
600 k
D:
100 k
Answer: B
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Refer to this Figure. If Vin was increased in amplitude a little, the signal voltage at the source of Q2 would

A:
increase.
B:
decrease.
C:
remain the same.
D:
distort.
Answer: C
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Input resistance of a common-drain amplifier is
A:
RG || RIN(gate).
B:
RG + RIN(gate).
C:
RG.
D:
RIN(gate).
Answer: A
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What limits the signal amplitude in an analog MOSFET switch?
A:
the switch input capacitance
B:
VGS(th)
C:
the switch's power handling
D:
VDS
Answer: B
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Calculate gm and rd if yfs = 4 mS and yos = 15S.
A:
4 mS, 66.7 k
B:
4 mS, 15 k
C:
66.7 k, 4 mS
D:
None of the above
Answer: A
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