For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?

Related Mcqs:

1. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is________________?

   A. 23dB
   B. 25dB
   C. 46dB
   D. 50dB

2. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?

   A. 2
   B. 1
   C. 1/2
   D. 0

3. A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________?

   A. 50KHz
   B. 100KHz
   C. 1000/17KHz
   D. 1000/7.07KHz

4. A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high______________?

   A. CMMR
   B. Bandwidth
   C. Slew rate
   D. Open-loop gain

5. Differential amplifiers are used in______________?

   A. Instrumentation amplifiers
   B. Voltage followers
   C. Voltage regulators
   D. Buffers

6. The closed-loop voltage gain of an inverting amplifier equal to______________?

   A. The ratio of the input resistance to feedback resistance
   B. The open-loop voltage gain
   C. The feedback resistance divided by the input resistance
   D. The input resistance

7. A non inverting closed loop op amp circuit generally has a gain factor______________?

   A. Less than one
   B. Greater than one
   C. Of zero
   D. Equal to one

8. 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. 795mV
   B. 395mV
   C. 795mV
   D. 39.5mV

9. 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

10. If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will_____________?

    A. Not need an input resistor
    B. Be virtual ground
    C. Have high reverse current
    D. Not invert the signal