A BiCMOS amplifier is shown in Fig. 3.78. Calculate the small-signal voltage gain v_o / v_i. Assume I_S= 10^ˆ’16A, β_F= 100, r_b= 0, V_A†’ ˆž, μ_nC_ox= 200 µA / V², V_t= 0.6 V, and λ= 0. Check your answer with SPICE and then use SPICE to investigate the effects of velocity saturation by including source degeneration in the MOS transistors as shown in Fig. 1.41 using ε_c= 1.5 × 10⁶V/m

Fig. 3.78:

Transcribed Image Text:

5 V 10 k2 10 kN R12 Оз 1 k2 R11 Q1 Q2 M1 300 1 kΩ R13 Vo M2 20 Vi 30 k2