Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF

The common mode gain is ___________

A. very high

B. very low

C. always unity

D. unpredictable

An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed

A. 79.5mV

B. 395mV

C. 795mV

D. 39.5mV

Current cannot flow to ground through .

A. a mechanical ground

B. an a.c. ground

C. a virtual ground

D. an ordinary ground

When a step-input is given to an OP-amp integrator, the output will be

A. A ramp

B. A sinusoidal wave

C. A rectangular wave

D. A triangular wave with dc bias