Question

H6P2 Phase inverter question

Answer 1

Only having trouble with this one part:
The circuit shown below has two MOSFETs. The input signal is presented to the gate of Q1. Q2 is configured as the two-terminal device that you explored in exercise S10E2. Here, Q2, with its gate connected to its drain, is used as a replacement for the load resistor in a common-source amplifier.
What is the Thevenin equivalent open-circuit voltage of the small-signal circuit, as seen from the output port? Write an algebraic expression for this vout in terms of the parameters K and VT, the bias voltage VIN, and the incremental input voltage vin.

the top mosfet has its gate tied to its drain, and then they ask for small signal vout. i don't understand how to even go about solving that..