CLIPPERS BY SRAVANI ANNAPURNA A(22171030357)
A clipping circuit consists of linear elements like resistor and non-linear elements like junction diodes or transistor,but it does not contain energy-storage elements like capacitors.Clipping circuits are used to select for purpose of transmission,that part of a signal wave from which lies above or below a certain reference voltage level.
Thus a clipper circuit can remove certain portions of an arbitary waveform near the positive or negative peaks.Clipping may be achived either at one level or two levels.Usually under the section of clipping,there is a chanse brought about in the wave shape of the signal.
Clipping circuits are also called slicers or amplitude selectors.
CLASSIFICATION OF CLIPPERS:
Clippers may be classified into two types based on the positioning of the diode.
- Series Clippers: Where the diode is in series with the load resistance and
- Shunt Clippers: Where the diode is shunted across the load resistance.
The diode capacitance affects the operation of the clipper at high frequency and influences the choice between the above two types.High frequency signals are attenuated in the shunt clippes as the diode capacitance provides an alternative path to output current.In series clipper,clipping effectiveness is reduced for the same reason as the high frequency currnts passes through without being sufficiently blocked.
Clippers may be classified based on the orientation(s)of the diode.The orientation decides whivh half cycle is affected by the clipping action.
The clipping action can be made to happen at an arbitrary level by using a biasing elements(potential sources)in series with the diode.
- Positively Biased Diode Clipper
- Negatively Biased Diode Clipper
The signal can be clipped to between two levels by using both types of diode clippers in combination.
This clipper is reffered to as Combination Diode Clipper or Two Level Clippers.....
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