1A differential amplifier should exhibit a differential gai

1.A differential amplifier should exhibit a _____ differential gain and a _____ common mode gain? A.low, low B. low, high C. high, low D. high, high

2. In a two-stage amplifier, the voltage gain of the first stage is 80 and the voltage gain of the second stage is 50. How much is the overall voltage gain? A. 4,000 B.130 C. 72 D.400

3 1 pts A differential amplifier provides an output that is the _____ of the two input quantities? A. multiplication B. difference C.square D. sine

4 Refer to Figure 1 - 2. The voltage at the base of this silicon transistor is _____? A. 0.3 V B. 0.7 V C. 11.3 V D. 0 V E.12 V

5. Increasing the resistance of the load resistor in an RC coupled common-emitter amplifier will have what effect on voltage gain? A. Decreases the voltage gain B.Does not affect the voltage gain C. Increases the voltage gain D. None of the above.

7 Assume that a certain differential amplifier has a differential gain of 5,000 and a common mode gain of 0.3. What is the CMRR in dB? A.84.44 dB B. 62.12 dB C. 1,500 dB D. 0.3 dB

8. A three-stage amplifier has a gain of 20 for each stage. The overall decibel voltage gain is _____? A.60 dB B. 400 dB C. 8,000 dB D. 78 dB.

9. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to _____? A. provide phase inversion B. provide a large voltage gain C. provide a high frequency path to improve the frequency response D. buffer the voltage amplifiers from the low resistance load and provide impedance matching for maximum power transfer.

10. Refer to Figure 1 - 1. The most probable cause of trouble, if any, from these voltage measurements is _____? A. the base-emitter junction is open B. a short from collector to emitter C. RE is open D. There are no problems.

11. For a bypass capacitor to work properly, the _____? A. XC should be ten times smaller than RE at the minimum operating frequency B. XC should equal RE C. XC should be twice the value of the RE D. XC should be ten times greater than RE at the minimum operating frequency.

12. The best selection for a high input impedance amplifier is a _____? A. high gain common-emitter B. low gain common-emitter C. common-collector D. common-base.

+12 V Re 1.2k RB -266 k Figure 12

Solution

1 Ans) C-high,low -----------high differential gain and low common mode gain

2 Ans) A-4000-------------80*50=4000

3 ans) B-----difference

4 ans)C-------11.3=======12-0.7

Only 1 question per post will be answered please but I answered 4 here