MOSFET Amplifier with a current source bias

A MOSFET Amplifier with a current source bias. For these matched nFET and pFET devices, Kn = 32 mA / V2, Kp = 10 mA / V2, and VT = 0.5V, Ith = 0.5 mA, "sigma" = 0.001 or VA = 25V for both nFETs and pFETs.

We calculated the capacitances for you: Cgd = 20fF (both nFET and pFET, operating in saturation) Cgs = 200fF (both nFET and pFET, operating in saturation) Cdb = 40fF (both nFET and pFET, operating in saturation) Csb = 60fF (both nFET and pFET, operating in saturation)

(a) Draw the low-frequency small-signal for this circuit and calculate the low-frequency parameters for the pFET devices. Iref is 0.25uA and 1.25uA mA.

(b) Calculate the gain from input to output and the output resistance of this circuit.

(c) Draw the new small-signal model taking into account capacitors. Calculate the frequency response (i.e. calculate the corner frequency(s) ) of this circuit assuming the input is driven by an ideal voltage sourcei and ideal voltage measurement.

Solutions Here