7.6 Various measurements are made on an NMOS amplifier for which the drain resistor RD is 20 kΩ. First, dc measurements show the voltage across the drain resistor, VRD, to be 2 V and the gate-to-source bias voltage to be 0.75 V. Then, ac measurements with small signals show the voltage gain to be –16 V/V. What is the value of Vt for this transistor? If the process transconductance parameter is 400 µA/V2, what is the MOSFET’s W/L?
0.5 V; 8