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Clipper

Positive Peak Shunt Clipper... Combinational Clipper... Positive Peak Series Clipper...

Positive Peak Biased Shunt Cli... Positive Peak Biased Series Cl... Negative Peak Shunt Clipper...

Negative Peak Series Clipper... Negative Peak Biased Shunt Cli...

Description

Theory:

The circuit with which wave form is shaped by removing a portion of the applied wave is known as clipping circuit.Clipping circuits (also known as limiters, amplitude selectors, or slicers), are used to remove the part of a signalthat is above or below some defined reference level.

An example of a clipper circuit is the half-wave rectifier. The half-wave rectifier is a circuit that allows only part ofan input signal to pass. The circuit is simply the combination of a single diode in series with a resistor, where theresistor is acting as a load.

Consider – if we add a 0.6 V DC source in series with a diode to the half wave rectifier. How will the outputwaveform change ?

Adding a 0.6 V battery to the circuit produces the corresponding output signal, shown in green from the inputsignal, shown in red. Ideal diode model is assumed here. The diode will be on only when the input is greater thanthe voltage across the battery, 0.6 V, since only then will the voltage across the diode be positive. (Vd = Vin – 0.6 V)The output voltage will be Vin - 0.6 (applying KVL). Whenever the input voltage falls below 0.6 V, the diode will bereverse biased.

Why are Clippers Used ?

Clipper circuits are used to eliminate amplitude noise or to produce new waveforms from an existing signal.

Further clipping circuits are used to select for purposes of transmission, that part of a signal wave form which liesabove or below a certain reference voltage level.

There are four kinds of Clippers – Series, Parallel, Biased Series and Biased Parallel.

Series Clippers

•Diode is in series with the load.

DIODE CLIPPER

AimThe aim is to understand Clipping Circuits

Related Experiments

•Diode is in series with the load.•Diodes “clip” a portion of the AC wave.•The diode “clips” any voltage that does not put it in forward bias.•Any type of signals can be applied to a clipper. Parallel ClippersDiode is in a branch parallel to the load.

Parallel clippers also known as shunt clippers uses a diode with a resistor, the diode forms a parallel path acrossthe output.

Procedure:

Here we will see only one type of clipper - the positive shunt clipper. You can try the others out of your own will.

Construct the circuit as below.

1.Use AC Source of 5 Volts from Function Generator and Freq 1 KHz2.Use a Diode and Resistor of 1 KOhms3.Connect Oscilloscope as shownRun the simulation (time-domain) and observe output waveforms

Reverse the orientation of the diode in the previous circuit to obtain a negative shunt clipper.

Conclusion

The result obtained will be as ahown above.