# What determines the bandwidth of an amplifier?

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## What determines the bandwidth of an amplifier?

This range of frequencies, for an audio amplifier is called its Bandwidth, (BW) and is primarily determined by the frequency response of the circuit. These -3dB corner frequency points define the frequency at which the output gain is reduced to 70.71% of its maximum value.

## How is bandwidth calculated in RC coupled amplifier?

Usually the bandwidth is measured based on the half power points i.e. the points where the output power becomes half the peak output power in the frequency Vs output graph. In simple words, bandwidth is the difference between the lower and upper half power points.

## What are the factors that affect low and high frequency response of a RC coupled amplifier?

The reactance of the emitter by pass capacitor CE is also very high during low frequencies. Hence it cannot shunt the emitter resistance effectively. With all these factors, the voltage gain rolls off at low frequencies.

## What is the advantage of RC coupled amplifier?

The following are the advantages of RC coupled amplifier. The frequency response of RC amplifier provides constant gain over a wide frequency range, hence most suitable for audio applications. The circuit is simple and has lower cost because it employs resistors and capacitors which are cheap.

## What is the relationship between gain and bandwidth of this amplifier?

Gain and bandwidth in an amplifier are inversely proportional to each other and their relationship is summarized as the unity-gain bandwidth. Unity-gain bandwidth defines the frequency at which the gain of an amplifier is equal to 1.

## Which amplifier has highest bandwidth?

3) In the class of all amplifiers with dc gain K, > 1 + fi, monotone frequency response, using only resistors and at most two operational amplifiers, and with output taken from the output of an operational amplifier, Circuit 5 has the largest bandwidth.

## What are the advantages of a RC coupled amplifier?

The following are the advantages of RC coupled amplifier. The frequency response of RC amplifier provides constant gain over a wide frequency range, hence most suitable for audio applications. The circuit is simple and has lower cost because it employs resistors and capacitors which are cheap.

## What are the factors that affect the bandwidth of an amplifier?

Describe factors affecting bandwidth in single stage common emitter amplifiers. • Stray capacitance and inductance in circuits and components. • Gain bandwidth product, cut off frequency fT. Describe basic methods for controlling bandwidth

## Why is phase reversal done twice in a RC coupled amplifier?

Because the phase reversal is done two times by the two stage CE configured amplifier circuit. Frequency response curve is a graph that indicates the relationship between voltage gain and function of frequency. The frequency response of a RC coupled amplifier is as shown in the following graph.

## Why does a RC coupled amplifier not shunt the signal?

This behaviour of the amplifier can be explained as follows : At low frequencies i.e. below 50 Hz, the reactance of coupling capacitor C C is quite high and hence very small part of the signal will pass from one stage to the next stage. Again C E can not shunt the emitter resistance R E effectively because of its large reactance at low frequencies.