the process of achieving, Thought of the Day HAPPINESS is found in the process of achieving, not merely in POSSESING. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers - 1 D.C. Kulshreshtha मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Topics to be discussed What is a Clipper Circuit ? General characteristic of a double clipper. Series negative clipper. Processing by series negative clipper. Series Biased Clippers. Guidelines to Solve. Numerical Examples. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 A circuit that clips off or removes a portion of the input signal. A clipper can process any type of signal. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

double clipper. General characteristic of a Upper Limiting level Upper threshold point मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 There can be single clippers : – Positive Negative Two categories : Series – Diode and load in series. Parallel – Diode and load in parallel. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Series negative clipper The circuit The transfer characteristics मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Processing by series negative clipper Square wave Draw the output. Triangular wave Draw the output. This clipper is like a half-wave rectifier. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Rectangular wave or Square wave ? Ans. Both are same. Usually, we call it a square wave. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

What happens if the diode in a half-wave rectifier is reversed ? Ans. It still remains a half-wave rectifier, but it now works as a positive clipper. Input Output ? मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Series Biased Clippers Bias means applying a dc voltage to change the dc level of a circuit. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Guidelines to Solve Determine the transition level at which the diode turns ON. With diode ON, find relation between vo and vi. Draw the transfer characteristic of the clipper. Plot the waveshape of vo for given input. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 We find that Diode is ON for vi > VB. Therefore, vi(tr) = VB. When diode is ON, vo = vi – VB. When diode is OFF, vo = 0. Plot the transfer characteristic of the clipper. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Characteristic (Graph between input and output) Draw the output wave corresponding to a sinusoidal input with Vm > VB मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Now, draw the output. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Example 1 Determine the output waveform for the clipper circuit, if the input is a sinusoidal wave of peak value 15 V. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Solution The direction of the diode suggests that it will be ON for positive values of vi. At transition level, मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 After diode is ON, मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Transfer characteristic Draw the output. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Example 2 Determine the output waveform for the clipper circuit of Example 1, if its input is as follows मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Solution Problem is simpler. Only two levels : vi = +15 V and vi = -5 V मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Now, you can draw the output. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1

Clippers and Clampers-1 Note that Total swing of vi is 15 – (-5) = 20 V. Total swing of vo is 18 – 0 = 18 V. Clipper circuit clipped off 2 V, and raised the dc level by 3 V. मंगलवार, 15 जनवरी 2019 Clippers and Clampers-1