Figure 2 shows a differential-output amplifier implemented in 18 nm finFET technology. Assume VDD = 1 V, Iref = 40 µA, nfinp = 150 for the pMOS, nfinn = 100 for the nMOS transistors, and C1 = C2 = C3 = C4 = 1 pF.
a) Derive an expression for the small-signal transfer function Vout+(s)/(Vin+(s) – Vin-(s)).
b) Evaluate the low-frequency voltage gain and all poles and zeros.