Exercise: Fet Amplifiers

Questions for: Fet Amplifiers

Referring to this figure, calculate the value of RD if the ac gain is 10. Assume VGSQ = ¼Vp.

A:
2.2 k
B:
2.42 k
C:
2.62 k
D:
2.82 k
Answer: D
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Referring to the following figure, calculate gm for VGSQ = –1.25 V.

A:
2 mS
B:
2.5 mS
C:
2.75 mS
D:
3.25 mS
Answer: C
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Refer to this figure. If Vin = 20 mV p-p what is the output voltage?

A:
176 mV p-p
B:
88 mV p-p
C:
48 mV p-p
D:
24 mV p-p
Answer: A
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For what value of ID is gm equal to 0.5 gm0?
A:
0 mA
B:
0.25 IDSS
C:
0.5 IDSS
D:
IDSS
Answer: B
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Use the following equation to calculate gm for a JFET having IDSS = 10 mA, VP = –5 V, and VGSQ = –2.5 V.

A:
2 mS
B:
3 mS
C:
4 mS
D:
5 mS
Answer: A
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