Question

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1. Select configuration for a single-transistor amplifier with a gain of 30 dB and input resistance of 5 Mohm. A) common-emitter; b) common-gate; c) common-source; d)common-collector; e) cannot be implemented by single stage amplifier. 2. Select configuration for a single-transistor amplifier with a gain close to 0 dB and input resistance of 5 Mohm and load resistor of 50 ohm. a) common-emitter; b) common-gate; c) common-source; d)common-collector; e) cannot be implemented by single stage amplifier 3. Design an oscillator with an amplifier with gain of 12 and phase angle of 160 degree, the feedback network is composed by 4 identical phase shifter. The phase shift of each phase shifter in degree should be close to: a) 40; b) 50; c)100; d)200; e) cannot be determined. 4. A feedback amplifier is needed to have high input impedance, low output impedance, which type of feedback amplifier will be needed? a) voltage amplifier; b) current amplifier; c) transconductance; d) transresistance; e) all of above 5. A feedback amplifier is needed to have low input impedance, low output Impedance, which type of feedback amplifier will be needed? a) voltage amplifier; b) current amplifier; c) transconductance; d) transresistance; e) all of above 6. A feedback amplifier is needed to have high input impedance, high output impedance, which type of feedback amplifier will be needed? a) voltage amplifier; b) current amplifier, c) transconductance; d) transresistance; e) all of above 7. Determine the type of the feedback amplifier a. Voltage Amplifier b. Current Amplifier c. Transconductance Amplifier d. Transresistance Amplifier w 8. Determine the type of the feedback amplifier a Voltage Amplifier b. Current Amplifier C. Transconductance Amplifier d. Transresistance Amplifier Tom 9. An inverting amplifier has gain of 40dB, the voltage gain is: a) -40; b) 2; c) 100; d) -100; e) 40 10. A 20pF capacitor is connected between its input and output of an voltage amplifier with voltage gain of-6, the Miller equivalent input capacitance is a) -20pF; b)120pF; c)140pF; d)-100pF; e) cannot be determined

Answer 1

Answers

4) - a) Voltage Amplifier

5) - b) Current Amplifier

6) - c) Transi

7) - d) Transresitance Amplifier

9) - c) 100

Gain(in db) = 20log₁₀(Av)

therefore Av = 10^(Gain/20)

10^(40/20) = 100 = Av