Title:

CLIPPER CIRCUIT

.

Abstract:

Clipper is a diode circuit used to eliminate part of a waveform

A clipper circuit is for clipping an upper portion and/or lower portion of a uni-directional sinusoidal voltage signal.

Voltage clipping limits the voltage to a device without affecting the rest of the waveform

In electronics, a clipper is a device designed to prevent the output of a circuit from exceeding a predetermined voltage level without distorting the remaining part of the applied waveform.

A clipping circuit consists of linear elements like resistors and non-linear elements like junction diodes or transistors, but it does not contain energy-storage elements like capacitors. Clipping circuits are used to select for purposes of transmission, that part of a signal wave form which lies above or below a certain reference voltage level.

Table of ContentsAbstract:......................................................................................... iTable of Contents........................................................................... ii1. Introduction..............................................................................11.1. Background............................................................................11.2. Objectives...............................................................................11.3. Theory..................................................................................12. Apparatus................................................................................23. Procedure4. Results......................................................................................35. Conclusions...............................................................................36. References................................................................................3

2-Introduction :

1. Background:

Voltage clipping limits the voltage to a device without affecting the rest of the waveform

In electronics, a clipper is a device designed to prevent the output of a circuit from exceeding a predetermined voltage level without distorting the remaining part of the applied waveform.

A clipping circuit consists of linear elements like resistors and non-linear elements like junction diodes or transistors, but it does not contain energy-storage elements like capacitors. Clipping circuits are used to select for purposes of transmission, that part of a signal wave form which lies above or below a certain reference voltage level.

Thus a clipper circuit can remove certain portions of an arbitrary waveform near the positive or negative peaks. Clipping may be achieved either at one level or two levels. Usually under the section of clipping, there is a change brought about in the wave shape of the signal.

Clipping Circuits are also called as Slicers, amplitude selectors or limiters.

2. Objectives:

To study the parallel biased top clipper circuit with the help of oscilloscope. To study the parallel biased bottom clipper circuit with the help of oscilloscope To study the series biased top clipper circuit with the help of oscilloscope To study the series biased bottom clipper circuit with the help of oscilloscope

3.Theory:

A clipper circuit for clipping an upper portion and/or lower portion of a uni-directional sinusoidal voltage signal. The clipper circuit comprises a uni-directional buffer amplifier biased to either a (+) or (-) voltage for taking a sinusoidal voltage signal with only a (+) or (-) band value as an input voltage signal, a first Zener diode whose anode is connected to an output port of said uni-directional buffer amplifier and cathode is connected to a predetermined voltage source for clipping the lower portion of the input voltage signal as a predetermined setting value, and a second Zener diode whose cathode is connected to the output port of the uni-directional buffer amplifier and whose anode is grounded for clipping the upper portion of the input voltage signal as a predetermined setting value.

Two shunt diode clipper circuits

In the example circuits above, one or two zener diodes are used to clip the voltage VIN. In the first circuit, the voltage is clipped to the reverse breakdown voltage of the zener diode. In the second, it is limited to the reverse breakdown voltage plus the voltage drop across one zener diode.

3-Apparatus: Resistors.

Junction diods. capcitors Transistors. Breadboard. Oscilloscope.

4-Procedure:

The following steps describe the procedure:

First of all, made the circuit diagrams on the paper.

Then gathered the equipments and apparatus and circuit elements.like transistors and resistors .

Joined the resistors transistors and diods on the breadboard according to the circuit diatgram

Made the circui

Connected the circuit with oscilloscpe

Applied a.c voltage

Obseved the waveform on the oscilloscope.

Firt we checked simply the digram of waveform

After that we checked the diagram of waveform with terminal changed.

In this the results were obtained.

5- Observations and Calculations: Diagarms of waveform

Diagram of waveform with terminal changed

Conclusion :

Using a clipper circuit It is observed that a clipper circuit can remove certain portions of an arbitrary waveform near the positive or negative peaks. Clipping may be achieved either at one level or two levels. Usually under the section of clipping, there is a change brought about in the wave shape of the signal. Clipper is a diode circuit used to eliminate part of a waveform

A clipper circuit is for clipping an upper portion and/or lower portion of a uni-directional sinusoidal voltage signal.

6-References :

Google search

Electronic Devices by Theraja.

Lab instructions

Class Lectures.