Various measurements are made on an NMOS amplifier for which the drain resistor RD is 20 k . First, DC measurements show the voltage across the drain resistor, VRD, to be 2 V and the gate-to-source bias voltage to be 1.2 V. Then, ac measurements with small signals show the voltage gain to be 10 V/V. What is the value of Vt for this transistor?

Various measurements are made on an NMOS amplifier for which the drain

1.	Various measurements are made on an NMOS amplifier for which the drain resistor R_D is 20 k . First, DC measurements show the voltage across the drain resistor, V_RD, to be 2 V and the gate-to-source bias voltage to be 1.2 V. Then, ac measurements with small signals show the voltage gain to be 10 V/V. What is the value of V_t for this transistor?
A.	0.7V
B.	0.8V
C.	0.9V
D.	1.0V
Answer» C. 0.9V