Which of the following circuits is used to add a DC offset to waveform?

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RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1

Answer 1

A Clamper circuit can be defined as the circuit that consists of a diode, a resistor, and a capacitor that shifts the waveform to the desired DC level without changing the actual appearance of the applied signal.
In order to maintain the time period of the waveform, the tau must be greater than, half the time period (discharging time of the capacitor should be slow)

Depending upon the shifting, the clamper circuit is divided into two:

Positive Clamper:

Negative Clamper:

Clippers:

A clipper is a device that removes either the positive half (top half) or negative half (bottom half), or both positive and negative halves of the input AC signal.
The clipping (removal) of the input AC signal is done in such a way that the remaining part of the input AC signal will not be distorted
In the below circuit diagram, the positive half cycles are removed by using the series positive clipper.

Rectifier:

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.
The reverse operation is performed by the inverter. The process is known as rectification since it "straightens" the direction of the current.

The correct representation of a center tap bridge wave rectifier is as shown:

Amplifiers:

An amplifier is an electronic device that can increase the power of a signal.
The input is given as a weak signal and the output is the amplified version of the input.
The amount of amplification provided by an amplifier is measured by its gain.