Find the low-frequency voltage gain from variation on each power supply to the op-amp out-put in Fig. 6.28. Assume that the bias voltages V_BIAS1, V_BIAS2, and V_BIAS3are produced by the circuit shown in Fig. 6.59, where M₁₀₆ is the only transistor that operates in the triode region. Assume that the W/L ratios are chosen so that all transistors in the op amp operate in the active region. Compare your calculations to SPICE simulations. Use models and supply voltages of your choice provided that the above conditions are satisfied.

Figure 6.28

Figure 6.59

VDD M4 VBIAS1 M5 V M2 M1 CL BIAS2 BIAS? M1A BIAS3 BIAS3 M12 M11 -Vss VDD M109 M103 M102, VBIAS1 M108 M104 M101, VBIAS2 M105 VBIAS3 IBIAS M107, M106 -Vss