Calculate the equivalent input noise volt-age at 100 Hz, 1 kHz, and 10 kHz for the CMOS op amp shown in Fig. 6.58. Use the MOS parameters in Table 2.4, and assume that X_d= 0.1 µm at the operating point for all transistors operating in the active region. For this problem, assume that the gate of M₉is attached to the positive power supply, and that the W/L of M₉has been optimally chosen to cancel the right-half-plane zero. The flicker-noise coefficient for all transistors is K_f= 3 × 10^ˆ’24F-V². Ignore gate-current noise in (11.15) and (11.16). Verify your result using SPICE.

Fig. 6.58:

VDD = 1.5 V 150 150 150 M7 M5 M8 Vi M2 M1 150 150 M9 200 5 pF M6 100 50 50 1 -VDD = -1.5 V