For the circuit shown in Fig. 1. the voltage amplifier is ideal (i.e. it has an

Question

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.

Explanation / Answer

a) Cin = A*C

b) Vo/ Vsig = 1/sCR

c)

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