Input capacitor of single stage amplifier circuit, Physics

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Input  Capacitor  Cin

An  ac  signal  is  supplied  to  gate  of  the  FET  through  an electrolytic capacitor known as input capacitor Cin. This capacitor allows only ac signal enter the gate however isolates the signal source from RG. If this capacitor isn't used, signal source  resistance  will  come  across  the  resistor  RG and  thus  changing  biasing conditions.

 


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