## The common-mode voltage gain is________________?

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# Operational Amplifier

## The input impedance of a differential amplifier equals r’e times________________?

The input impedance of a differential amplifier equals r’e times________________? A. ß B. RE C. RCD. 2ß

## The node voltage at the top of the til resistor is closes to________________?

The node voltage at the top of the til resistor is closes to________________? A. collector supply voltageB. zero C. emitter supply voltage D. tail current times base resistance

## The Op-amp can amplify______________?

The Op-amp can amplify______________? A. a.c. signals only B. d.c. signals onlyC. both a.c. and d.c. signals D. neither d.c. nor a.c. signals

## A certain noninverting amplifier has Ri of 1 kO and Rf of 100 kO. The closed-loop voltage gain…

A certain noninverting amplifier has Ri of 1 kO and Rf of 100 kO. The closed-loop voltage gain is_____________? A. 100,000 B. 1000C. 101 D. 100

## For an Op-amp with negative feedback, the output is_________________?

For an Op-amp with negative feedback, the output is_________________? A. equal to the input B. increasedC. fed back to the inverting input D. fed back to the noninverting input

## Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp…

Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is________________? A. 1 B. 2000 C. 80 dBD. 100,000

## If ADM = 3500 and ACM = 0.35, the CMRR is _______________?

If ADM = 3500 and ACM = 0.35, the CMRR is _______________? A. 1225 B. 10,000 C. 80 dBD. answers (A) and (B)

## The common-mode gain is ________________?

The common-mode gain is ________________? A. very highB. very low C. always unity D. unpredictable

## In differential-mode, ______________?

In differential-mode, ______________? A. opposite polarity signals are applied to the inputs B. the gain is one C. the outputs are of different amplitudes D. only one supply voltage is used

## The differential gain is _____________?

The differential gain is _____________? A. very high B. very low C. dependent on input voltage D. about 100