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Chapter 10: Problem 1

The low-frequency response of an amplifier is determined in part by (a) the voltage gain (b) the type of transistor (c) the supply voltage (d) the coupling capacitors

Short Answer

Expert verified
The low-frequency response of an amplifier is primarily determined by (d) the coupling capacitors. They form a high-pass filter network with other components, such as resistors, in the input and/or output stage of the amplifier, which then decides the cut-off frequency below which the amplifier's gain starts to decrease.

Step by step solution

01

Analyze Option (a) - The Voltage Gain

The voltage gain is an important parameter of an amplifier, as it determines how much the input signal is amplified. However, it does not directly affect the low-frequency response of the amplifier. It just determines the overall amplification of the signal across all frequencies.
02

Analyze Option (b) - The Type of Transistor

The type of transistor can have some effect on the amplifier's performance, especially at high frequencies (because different transistors have different internal capacitances which affect the response in high-frequency regime). However, the low-frequency response is generally not affected significantly by the transistor type.
03

Analyze Option (c) - The Supply Voltage

While the supply voltage has an effect on the amplitude of the output signal an amplifier can deliver, it does not have a significant effect on the low-frequency response of the amplifier. The amplifier's low-frequency response is determined more by the passive components in the circuit, such as the capacitors and resistors.
04

Analyze Option (d) - The Coupling Capacitors

The coupling capacitors are the key factors that determine the low-frequency response of an amplifier. They form a high-pass filter network with other components (usually, resistors) in the input and/or output stage of the amplifier. The value of the coupling capacitors and the corresponding resistors decides the cut-off frequency, below which the amplifier's gain starts to decrease. When the value of the coupling capacitors is small, the cut-off frequency increases, shifting the low-frequency response of the amplifier towards higher frequencies.
05

Conclusion

Based on our analysis, the correct answer is (d) the coupling capacitors. They play a crucial role in determining the low-frequency response of an amplifier.

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