1. The first pole encountered in the frequency response of a compensated OP-AMP is approximately at

a. 5 Hz

b. 10 kHz

c. 1 MHz

d. 100 MHz

Solution:
https://www.youtube.com/watch?v=vNhlXUA_cPE

2. Negative feedback in an amplifier

a. Reduces gain

b. Increases frequency and phase distortions

c. Reduces bandwidth

d. Increases noise

Solution:
https://www.youtube.com/watch?v=o1AX_Gy7UVY

3. Crossover distortion behavior is characteristic of

a. Class A output stage

b. Class B output stage

c. Class AB output stage

d. Common base output stage

Solution:
https://www.youtube.com/watch?v=1ussDIU0A0E

4. An NPN transistor (with C = 0.3 pF) has a unity gain cutoff frequency f

a. 15

b. 30

c. 50

d. 96

Solution:
https://www.youtube.com/watch?v=mUt2uMzD7q8

5. An amplifier has an Open loop gain of 100, an input impedance of 1 kΩ and an output impedance of 100 Ω. A feedback network with a feedback factor of 0.99 is connected to the amplifier in a voltage series feedback mode. The new input and output impedances, respectively are

a. 10 Ω and 1 Ω

b. 10 Ω and 10 kΩ

c. 100 kΩ and 1 Ω

d. 100 kΩ and 1 kΩ

Solution:
https://www.youtube.com/watch?v=3DTp9wyB8J8

6. An amplifier is assumed to have a single pole high frequency transfer function. The rise time of its output response to a step function input is 35 nsec. The upper -3 dB frequency (in MHz) for the amplifier to a sinusoidal input is approximately at

a. 4.55

b. 10

c. 20

d. 28.6

Solution:
https://www.youtube.com/watch?v=-8aPpRbUUjI

7. A bipolar junction transistor amplifier is shown below. Assume that the current source I

Determine the ac small signal mid band voltage gain (V

8. A JFET having µ = 50 and r

Determine the ac small signal mid band voltage gain (V

9. Neatly sketch and label the DC transfer characteristic (V

Assume ideal operational amplifier and the diodes have a forward voltage of 0.6 volts and zero incremental resistance.

10. A transistor LC oscillator circuit is shown below.

Assume that the transistor has very high value of β(so that you may neglect r

a. 5 Hz

b. 10 kHz

c. 1 MHz

d. 100 MHz

2. Negative feedback in an amplifier

a. Reduces gain

b. Increases frequency and phase distortions

c. Reduces bandwidth

d. Increases noise

3. Crossover distortion behavior is characteristic of

a. Class A output stage

b. Class B output stage

c. Class AB output stage

d. Common base output stage

4. An NPN transistor (with C = 0.3 pF) has a unity gain cutoff frequency f

_{τ}of 400 MHz at a dc bias current I_{C}= 1 mA. The value of its C_{µ}(in pF) is approximately (V_{T}= 26 mV)a. 15

b. 30

c. 50

d. 96

5. An amplifier has an Open loop gain of 100, an input impedance of 1 kΩ and an output impedance of 100 Ω. A feedback network with a feedback factor of 0.99 is connected to the amplifier in a voltage series feedback mode. The new input and output impedances, respectively are

a. 10 Ω and 1 Ω

b. 10 Ω and 10 kΩ

c. 100 kΩ and 1 Ω

d. 100 kΩ and 1 kΩ

6. An amplifier is assumed to have a single pole high frequency transfer function. The rise time of its output response to a step function input is 35 nsec. The upper -3 dB frequency (in MHz) for the amplifier to a sinusoidal input is approximately at

a. 4.55

b. 10

c. 20

d. 28.6

7. A bipolar junction transistor amplifier is shown below. Assume that the current source I

_{bias}is ideal, and the transistor has very large β, r_{b}= 0 and r_{0}-> ∞.Determine the ac small signal mid band voltage gain (V

_{o}/ V_{s}), input resistance (R_{i}) and output resistance (R_{o}) of the circuit. Assume V_{T}= 26 mV.**Solution:****https://www.youtube.com/watch?v=v7SNdH3FhnI**8. A JFET having µ = 50 and r

_{d}= 10 kΩ is used in a common source configuration as shown. The JFET capaciances are C_{gs}= 5 pF, C_{gd}= 2 pF and C_{ds}= 2 pF.Determine the ac small signal mid band voltage gain (V

_{o}/V_{s}) and the upper 3 dB frequency of the circuit.**Solution:****https://www.youtube.com/watch?v=Uzt9ZG6ctvE**9. Neatly sketch and label the DC transfer characteristic (V

_{o}verses V_{in}) of the circuit shown, as V_{in}varies from – 2 volts to + 2 volts.Assume ideal operational amplifier and the diodes have a forward voltage of 0.6 volts and zero incremental resistance.

**Solution:****https://www.youtube.com/watch?v=nQxPNSMoOiw**10. A transistor LC oscillator circuit is shown below.

Assume that the transistor has very high value of β(so that you may neglect r

_{b}). Derive an equation governing the circuit operation, and find the frequency of oscillation. Also state the gain condition required for oscillation to start.
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