FET Amplifiers – Exercise – 2

71. What common factor determines the voltage gain and input resistance of a common-gate amplifier?

(a) RD
(b) RL
(c)
(d)

Answer
Answer : (c)
Explanation
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72. The input resistance at the gate of a FET is extremely

(a) high.
(b) low. Answer:
(c)
(d)

Answer
Answer : (a)
Explanation
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73. E-MOSFETs are generally used in switching applications because

(a) of their very low input capacitance.
(b) of their threshold characteristic (VGS(th)).
(c) of their high-frequency response capabilities.
(d) of their power handling.

Answer
Answer : (b)
Explanation
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74. Class D amplifiers differ from all other classes of amplifiers because

(a) the output transistors are operated as switches.
(b) of their very low input capacitance.
(c) of their high-frequency response capabilities.
(d) they employ dual MOSFETs.

Answer
Answer : (a)
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75. 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
Answer : (b)
Explanation
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