题目内容

Which state is wrong ()?

A. Series feedback connections tend to increase the input resistance; while, shunt feedback connections tend to decrease the input resistance.
B. Shunt feedback connections tend to decrease the input resistance and voltage feedback tends to decrease the output impedance.
C. Voltage feedback tends to decrease the output impedance, while, current feedback tends to increase the output impedance.
D. Series feedback connections tend to increase the input resistance and the current feedback tends to decrease the output impedance.

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In the oscillator, the feedback signal must be ().

A. positive
B. negative
C. positive or negative.

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In the oscillator, the overall gain must be () one (unity gain).

A. equal to
B. greater than
C. smaller than

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FET Amplifiers have the following characteristics except ()

A. Excellent voltage gain
B. Low input impedance
C. Low-power consumption
D. Good frequency range

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The operational amplifier can ()

A. amplify the differential signal while rejecting the differential signal at the two inputs.
B. amplify the differential signal while rejecting the common signal at the two inputs.
C. amplify the common l signal while rejecting the differential signal at the two inputs.
D. amplify the common signal while rejecting the common signal at the two inputs.

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