Mumbai University > EXTC > Sem 3 > Analog Electronics 1

Marks: 7 M

Year: May 2014

Series and shunt clippers

• It is device used to limit amplitude or clip away some portion of input signal without distorting remaining part of the input signal.

• Series clippers: In series clippers, the diode is connected in series with the output. Depending on diode connection series clippers are divided into two types

  1. Positive series clipper: During positive half of cycle input voltage is positive therefore diode is reversed biased and act as open circuit hence output is zero. During negative half input voltage is negative, diode is forward biased and act as a closed switch and hence all the input voltage drop appear across the resistor as shown in Fig1 (b)

Fig1 (a) circuit diagram (b) output waveform for sine wave input

2.Negative series clipper: During positive half cycle of input voltage is positive therefore diode is forward biased and act as closed switch hence all the input voltage drop appear across the resistor. During negative half input voltage is negative therefore diode is reversed biased and act as open circuit hence output is zero as shown in Fig2 (b)

Fig2 (a) circuit diagram (b) output waveform for sine wave input

• Shunt clippers: In shunt clippers, the diode is connected in parallel with the output. Depending on diode connection shunt clippers are divided into two types
  1. Positive shunt clipper: During positive half cycle of input voltage is positive therefore diode is forward biased and act as closed switch hence all the current flows through the diode and no voltage drop across the output and output is zero. During negative half cycle input voltage is negative hence diode is reverse biased and act as open switch hence there is direct connection between input and output hence during negative half we get output waveform as shown in Fig3 (b)

Fig3 (a) circuit diagram (b) output waveform for sine wave input

2.Negative shunt clipper: During positive half cycle of input voltage is positive therefore diode is reverse biased and act as open switch hence there is direct connection between input and output hence during positive half we get output waveform. During negative half cycle input voltage is negative therefore diode is forward biased and act as closed switch hence all the current flows through the diode and no voltage drop across the output and output is zero as shown in Fig4 (b)

Fig4 (a) circuit diagram (b) output waveform for sine wave input