The steady state output (V_out), of the circuit shown below, will

For the circuit shown below with ideal diodes, the output will be

The output impedance of a non-ideal operational amplifier is denoted by Z_out. The variation in the magnitude of Z_out with increasing frequency, f, in the circuit shown below, is best represented by

The current gain (I_out/I_in) in the circuit with an ideal current amplifier given below is