EEC 210
HW 9
1. Calculate the total input- and output-referred noise voltages at 10 Hz, 100 kHz, and 1 GHz for the common-source amplifier whose ac schematic is shown below. Assume that W = 100 µm, L = 1 µm, ID = 100 µA, Vt = 0. 6 V, k′ = 194 µA/V2 , tox = 80 A° , Ld = 0, Xd = 0, and Kf = 3 × 10−24 F-V2 . Ignore shot noise gener- ated by gate leakage current calculated in Equation (11.15) as well as thermally induced gate noise calculated in Equation (11.16). Verify your result using SPICE. (Add dc sources for SPICE.)
2. Calculate the equivalent input noise voltage at 100 Hz, 1 kHz, and 10 kHz for the CMOS op amp shown below. Use the MOS parameters in Table 2.4 at the end of this homework, and assume that Xd = 0. 1 µm at the operating point for all transis- tors operating in the active region. For this problem, assume that the gate of M9 is attached to the positive power supply, and that the W/L of M9 has been optimally chosen to cancel the right-half-plane zero. The flicker-noise coefficient for all tran- sistors is Kf = 3 × 10−24 F-V2 . Ignore shot noise generated by gate leakage current calculated in Equation (11.15) as well as thermally induced gate noise calculated in Equation (11.16). Verify your result using SPICE.