Using the expression you just derived, let's crunch the numbers again. Remember, our power MOSFET has K=2.0A/V2 and VT=2.0. And we are driving a RS=16Ω earphone load. Assume here that our input bias voltage VIN=6.9 V.
If we have an incremental input of vi=0.003V what is the incremental output vo (in Volts)?
H5P1 section
As VIN is increased, the output voltage VOUT decreases and the MOSFET goes out of saturation. For the value or RL found above, what is the maximum input voltage VIN in volts such that the MOSFET will remain in the saturation region?