Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?

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 . CMRR=80 dB. The common mode gain is given by________?

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

3. An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?

   A. 1/11KΩ
   B. 1/5KΩ
   C. 5KΩ
   D. 11KΩ

4. A change in the value of the emitter resistance Re in a differential amplifier?

   A. affects the difference mode gain Ad
   B. affects the common mode gain Ac
   C.affects both Ad and Ac
   D. does not effect either Ad and Ac

5. 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

6. Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?

   A. Internal Capacitance of the device
   B. Coupling capacitor at the input
   C. Skin effect
   D. Coupling capacitor at the output

7. Which of the following amplifier circuit using junction transistor has the best gain?

   A. Common base
   B. Common emitter
   C. Common collector
   D. All have the same gain

8. An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?

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

9. The early effect in a bipolar junction transistor is caused by_______________?

   A. fast turn-on
   B. fast turn-off
   C. large collector-base reverse bias
   D. large emitter-base forward bias

10. The current gain of a bipolar transistor drops at high frequencies because of____________?

    A. Transistor capacitances
    B. High current effects in the base
    C. Parasitic inductive elements
    D. The early effect