A JFET common gate amplifier circuit is shown in Figure la. The supply voltage is 15V. The JFET has the following parameters which are: Ioss 40mA and Vp -2V. The JFET is biased at Vs 1V. The resistors have the following values: R-1000, &= 1㏀ and Ro = R. =7.5kS2. +15V out Output Cin Ri Fig. la (a) Draw the small signal ac equivalent circuit of this amplifier (b) Calculate the value of the trans conductance. ) Clculate the small-signal voltage gain of this amplifier. (d) Calculate the high cut-off frequency at the input side. e Calculate the high cut-off frequency at the output side. [5 marks] [5 marks] [5 marks] [4 marks] [4 marks] [2 marks] Determine the dominant pole frequency ofthis amplifier.
{}