, EEE 334 Circuits II – Quiz 4/5: MOSFET
Amplifiers | Common-Source, Biasing, Small-
Signal Analysis & Voltage Gain | Questions &
Answers | rated 100% correct.
SECTION 1: COMMON-SOURCE AMPLIFIER
FUNDAMENTALS (Questions 1–10)
1. In a common-source (CS) amplifier, the output voltage is taken at
the:
A) Gate
B) Source
C) Drain
D) Body terminal
Correct Answer: C
Rationale: In a common-source amplifier, the input signal is applied to the
gate, the output is taken from the drain, and the source is common to both
input and output (typically connected to ground or a bias circuit) .
Source: EEE 334 Quiz 4/5: MOSFET Amplifiers
2. There is a 180° phase inversion between which two voltages in a
CS amplifier?
A) Gate and source voltage
B) Gate and drain voltage
C) Source and drain voltage
D) Drain and body voltage
Correct Answer: B
, Rationale: The common-source amplifier produces a 180-degree phase
shift (inversion) between the gate (input) and drain (output) voltages.
This occurs because when the gate voltage increases, the drain current
increases, causing the drain voltage to decrease .
Source: EEE 334 Quiz 4/5: MOSFET Amplifiers
3. Which of the following statements about the common-source
amplifier is TRUE?
A) It has a voltage gain of approximately 1
B) It has high voltage gain and medium input resistance
C) It has very low input resistance
D) It is non-inverting
Correct Answer: B
Rationale: The common-source amplifier offers good voltage gain
(typically in the range of 10-100+) and medium to high input resistance
(due to the MOSFET's gate being isolated from the channel). Unlike the
common-drain (source follower) which has unity gain, the CS amplifier
provides significant voltage amplification. The output is inverted (180°
phase shift) relative to the input .
Source: EEE 334 Quiz 4/5: MOSFET Amplifiers
4. If you are looking for both good voltage gain and high input
resistance, which amplifier configuration should you use?
A) CS amplifier
B) CG amplifier
C) CD amplifier
D) Cascade amplifier
Correct Answer: A
Rationale: The common-source amplifier provides both good voltage gain
and high input resistance. The common-gate amplifier has very low input
resistance, and the common-drain (source follower) has a voltage gain of
Amplifiers | Common-Source, Biasing, Small-
Signal Analysis & Voltage Gain | Questions &
Answers | rated 100% correct.
SECTION 1: COMMON-SOURCE AMPLIFIER
FUNDAMENTALS (Questions 1–10)
1. In a common-source (CS) amplifier, the output voltage is taken at
the:
A) Gate
B) Source
C) Drain
D) Body terminal
Correct Answer: C
Rationale: In a common-source amplifier, the input signal is applied to the
gate, the output is taken from the drain, and the source is common to both
input and output (typically connected to ground or a bias circuit) .
Source: EEE 334 Quiz 4/5: MOSFET Amplifiers
2. There is a 180° phase inversion between which two voltages in a
CS amplifier?
A) Gate and source voltage
B) Gate and drain voltage
C) Source and drain voltage
D) Drain and body voltage
Correct Answer: B
, Rationale: The common-source amplifier produces a 180-degree phase
shift (inversion) between the gate (input) and drain (output) voltages.
This occurs because when the gate voltage increases, the drain current
increases, causing the drain voltage to decrease .
Source: EEE 334 Quiz 4/5: MOSFET Amplifiers
3. Which of the following statements about the common-source
amplifier is TRUE?
A) It has a voltage gain of approximately 1
B) It has high voltage gain and medium input resistance
C) It has very low input resistance
D) It is non-inverting
Correct Answer: B
Rationale: The common-source amplifier offers good voltage gain
(typically in the range of 10-100+) and medium to high input resistance
(due to the MOSFET's gate being isolated from the channel). Unlike the
common-drain (source follower) which has unity gain, the CS amplifier
provides significant voltage amplification. The output is inverted (180°
phase shift) relative to the input .
Source: EEE 334 Quiz 4/5: MOSFET Amplifiers
4. If you are looking for both good voltage gain and high input
resistance, which amplifier configuration should you use?
A) CS amplifier
B) CG amplifier
C) CD amplifier
D) Cascade amplifier
Correct Answer: A
Rationale: The common-source amplifier provides both good voltage gain
and high input resistance. The common-gate amplifier has very low input
resistance, and the common-drain (source follower) has a voltage gain of
