To study the clipping circuits for different reference voltages and to verify the responses.

Aim

To study the clipping circuits for different reference voltages and to verify the responses.

Apparatus Required:

Components Required:

Theory

The non-linear semiconductor diode in combination with resistor can function as clipper circuit. Energy storage circuit components are not required in the basic process of clipping. These circuits will select part of an arbitrary waveform which lies above or below some particular reference voltage level and that selected part of the waveform is used for transmission. So they are referred as voltage limiters, current limiters, amplitude selectors or slicers. There are three different types of clipping circuits.

1. Positive Clipping circuit.
2. Negative Clipping.
3. Positive and Negative Clipping (slicer).

In positive clipping circuit positive cycle of Sinusoidal signal is clipped and negative portion of sinusoidal signal is obtained in the output of reference voltage is added, instead of complete positive cycle that portion of the positive cycle which is above the reference voltage value is clipped. In negative clipping circuit instead of positive portion of sinusoidal signal, negative portion is clipped. In slicer both positive and negative portions of the sinusoidal signal are clipped.

Procedure

1. Connect the circuit as shown in the circuit diagram.
2. Connect the function generator at the input terminals and CRO at the output terminals of the circuit.
3. Apply a sine wave signal of frequency 1 KHz, Amplitude greater than the reference voltage at the input and observe the output waveforms of the circuits.

Circuit Diagram

Positive Cliper

Negative Cliper

Model Graph

Tabular Column

Negative Clipper

Unbiased Clipper
Vref= 0V	Vref= 0V
Output voltage (V)	Time Period (ms)	Output voltage (V)	Time Period (ms)
Biased Clipper
Vref= 2V	Vref= 2V
Output voltage (V)	Time Period (ms)	Output voltage (V)	Time Period (ms)

V rms(V)

V rpp(V)

V dc(V)

Ripple factor

Result

Post Lab Questions

1. Differentiate +ve and -ve Clippers.
2. What is the function of Clampers?
3. Write the classifications of clippers and clampers.
4. Draw the output for the given input to the clamper circuit
5. What is the need of wave shaping circuit?