Q. Explain biased and double clipper circuits.

Clipper can be either forward biased or reverse biased. If a battery is connected in series with the diode in a positive clipper,we get a biased clipper circuit.Here Vi is the input voltage given.VB is the voltage across the battery and output voltageis Vo.If the voltage level at input is greater than (V_i + V_D) (V_D is the voltage drop across the diode ,)which is .7V for silicon and .2V For germanium at 25 degree celcius,the diode conducts.The output voltage becomes (V_i + V_D) at the instance input voltage exceeds (V_i + V_D).If input voltage is less than this value dsiode is reverse biased and acts like an open switch.

In a biased negative clipper,both the polaritiesof the diode and battery are reversed. So a part of negative half cycle is cut off. Combination of positive and negative clipper is called a double clipper.Here a part of both negative and positive half cut off.

The clipping level for +ve clipper is (VB₁ + VD₁), where VD₁ is the knee voltage of diode D₁ and for diode 2 it is (VB₂+ VD₂) where VD₂ is the knee voltage of diode D₂.