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Chapter: Electronic Circuits - Wave Shaping and Multivibrator Circuits

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Series clipper

The response of the series configuration to a variety of alternating waveforms is provided although first introduced as a half-wave rectifier (for sinusoidal waveforms); there are no boundaries on the type of signals that can be applied to a clipper.

Clippers

 

Series clipper

 

The response of the series configuration to a variety of alternating waveforms is provided although first introduced as a half-wave rectifier (for sinusoidal waveforms); there are no boundaries on the type of signals that can be applied to a clipper. The addition of a dc supply can have a pronounced effect on the output of a clipper. Our initial discussion will be limited to ideal diodes, with the effect of VT reserved for a concluding example.

 

Circuit diagram:



 

There is no general procedure for analyzing networks such as the type in Fig but there are a few thoughts to keep in mind as you work toward a solution. Make a mental sketch of the response of the network based on the direction of the diode and the applied voltage levels. For the network, the direction of the diode suggests that the signal must be positive to turn it on. The dc supply further requires that the voltage be greater than V volts to turn the diode on.

 

The negative region of the input signal is ―pressuring the diode into the ―off state, supported further by the dc supply. In general, therefore, we can be quite sure that the diode is an open circuit (―off

state) for the negative region of the input signal. Determine the applied voltage (transition voltage) that will cause a change in state for the diode: For an input voltage greater than V volts the diode is in the short-circuit state, while for input voltages less than V volts it is in the open-circuit or ―off state.

 

Determining the transition level for the circuit


Be continually aware of the defined terminals and polarity of Vo. When the diode is in the short-circuit state, such as shown in Fig. , the output voltage Vo can be determined by applying Kirchhoff‘s

voltage law in the clockwise direction Vi – V – Vo (CW direction)


It can be helpful to sketch the input signal above the output and determine the output at instantaneous values of the input:


It is then possible that the output voltage can be sketched from the resulting data points of as demonstrated. Keep in mind that at an instantaneous value of vi the input can be treated as a dc supply of that value and the corresponding dc value (the instantaneous value) of the output determined. For instance, at Vi = Vm for the network, the network to be analyzed appears. For Vm > V the diode is in the short-circuit state and Vo = Vm - V.

 

Determining Levels Of Vo


Determining Vo When Vi = Vm

 

At the Vi = Vm diodes change state; at Vi = – Vm, Vo =0 V; and the complete curve for Vo can be sketched.




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