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CLIPPERS

There are a variety of diode networks called clippers that have the ability to “clip” off a portion of the inputsignal without distorting the remaining part of the alternating waveform. The half-wave rectifier of is an example of the simplest form of diode clipper - one resistor and diode. Depending on theorientation of the diode, the positive or negative region of the input signal is “clipped” off.

There are two general categories of clippers: series and parallel. The series configuration is defined asone where the diode is in series with the load, while the parallel variety has the diode in a branch parallel to the load.

Series

The response of the series configuration of Fig.1a. To a varietyof alternating waveforms is provided in Fig.1b. 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 aclipper. The addition of a dc supply such as shown in Fig. 2. Can have a pronounced effect on the output of a clipper.figure 1. Series clipper.

Figure 2. Series clipper with a dc supply
There is no general procedure for analyzing networks such as the type in Fig. 2, but there are a few thoughts tokeep in mind as you work toward a solution.

1. 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 of Fig.2, the direction of the diode suggests that the signal vi must be positive to turn it on. The dc supply further requires that the voltage vi be greater than V volts to turn the diode on. The negativeregion 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”...