Assume the BiCMOS amplifier of Fig. 3.78 is fed from a current source. Calculate the low-frequency small-signal transresistance Ï…_o/i_i, the loop gain, and the input and output impedances of the circuit. Use data as in Problem 3.17. Compare your answers with a SPICE simulation and also use SPICE to plot the complete large-signal transfer characteristic of the circuit.

Data from Prob. 3.17:

The ac schematic of a shunt-series feedback amplifier is shown in Fig. 8.31. Element values are R_F = 1 kΩ, R_E = 100 Ω, R_L1 = 4 kΩ, R_S = 1/_yS = 1 kΩ, and z_L = 0. Device data: β = 200, r_b = 0, I_C1 = I_C2 = 1 mA, V_A = 100 V.

Fig. 3.78:

Transcribed Image Text:

5 V 10 k2 10 k2 R12 1 k2 R11 Q2 M1 300 1 k2 R13 M2 Vị 20 30 k2