Exercise: Bjt Amplifiers

Questions for: Bjt Amplifiers

For a common-emitter amplifier, the purpose of the emitter bypass capacitor is
A:
no purpose, since it is shorted out by RE.
B:
to reduce noise.
C:
to despike the supply voltage.
D:
to maximize amplifier gain.
Answer: D
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Refer to this figure. Find the value of Rin(base).

A:
420
B:
50 k
C:
940
D:
100.8
Answer: B
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Which of the following configurations has an output impedance Zo equal to RC?
A:
Fixed-bias common-emitter
B:
Common-emitter voltage-divider with bypass capacitor
C:
Common-emitter voltage-divider without bypass capacitor
D:
All of the above
Answer: D
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The total gain of a multistage amplifier is the ________.
A:
sum of individual voltage gains
B:
sum of dB voltage gains
C:
D:
Answer: B
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A common-collector amplifier has ________ input resistance, ________ current gain, and ________ voltage gain.
A:
high, high, low
B:
high, low, low
C:
high, low, high
D:
Answer: A
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