Operational Amplifier

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________________? A. collector supply voltageB. zero C. emitter supply voltage D. tail current times base resistance

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 is_____________? A. 100,000 B. 1000C. 101 D. 100

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 is________________? A. 1 B. 2000 C. 80 dBD. 100,000

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 ________________? A. very highB. very low C. always unity D. unpredictable

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