For the circuit shown in Fig 1 the voltage amplifier is idea

For the circuit shown in Fig. 1. the voltage amplifier is ideal (i.e. it has an infinite input resistance and a zero output resistance). Use the Miller approach to find an expression for the input capacitance C_in in terms of A and C. Use the expression for C_in to obtain the transfer function V_o(s)/V_sig (s). If R_sig = 1KOhm. and gain V_o/V_sig is to have a dc value of 40dB and a 3-dB frequency of 100kHz. find the values required for A and C. Sketch a Bode plot for the gain and use it to determine the frequency at which its magnitude reduces to unity.

Solution

a) Cin = A*C

b) Vo/ Vsig = 1/sCR

c)