For the bias circuit shown in Fig. 4.66, determine the bias current. Assume that X_d= L_d= 0. Neglect base currents and the body effect. Comment on the temperature dependence of the bias current. Assume a channel mobility and oxide thickness from Table 2.4. Compare your calculations to a SPICE simulation using a full circuit model from Table 2.4, and also use SPICE to determine the supply-voltage sensitivity of I_BIAS.

Fig. 4.66:

+3V 50 50 M3 | IBIAS M1 M2 50 100 1 Q2 Q1 10x Bipolar transistors