Q.1.
Calculate the overall voltage gain Gv of a common source amplifier for which gm = 2mA/V, RD =kΩ, R0 =kΩ and RG =MΩ. The amplifier is fed from a signal source of Thevenin resistance of 0.5MΩ and the amplifier is coupled with a load ofkΩ.
- a) -11.2 V/V
- b) -22.4 V/V
- c) -33.6 V/V
- d) -44.8 V/V
Q.2.
The MOSFET circuit below has Vt = 1V, knW/L = 0.8 mA/V2 and VA = 40V. Find the value of RG so that iD = 0.1 mA, the largest possible value of RD is used while the maximum signal swing at the drain is ofand the input resistance at the gate isMΩ.
- a) 1 MΩ
- b) 10 MΩ
- c) 0.1 MΩ
- d) 0.01 MΩ
Q.3.
The MOSFET circuit below has Vt = 1V, knW/L = 0.8 mA/V2 and VA = 40V. Find the value of gm at the bias point.
- a) 0.1 mA/V
- b) 0.2 mA/V
- c) .0.3 mA/V
- d) 0.4 mA/V
Q.4.
The MOSFET circuit below has Vt = 1V, knW/L = 0.8 mA/V2 and VA = 40V. If terminal Z is grounded, X is connected to a signal source having a resistance of 1 MΩ and terminal Y is connected to a load resistance ofkΩ, find the voltage gain from the signal source to the load.
- a) 3.25 v/V
- b) 6.5 V/V
- c) 9.75 V/V
- d) 13 V/V
Q.5.
The MOSFET circuit below has Vt = 1V, knW/L = 0.8 mA/V2 and VA = 40V. If terminal Y is grounded find the voltage gain from X to Z with Z open-circuit.
- a) 0.33 V/V
- b) 0.66 V/V
- c) 0.99 V/V
- d) None of the mentioned
Q.6.
The MOSFET circuit below has Vt = 1V, knW/L = 0.8 mA/V2 and VA = 40V. If terminal X is grounded and terminal Z is connected to a current source delivering a current ofµA and having a resistance ofkΩ, find the voltage signal that can be measured at Y neglecting the effect of V0.
- a) 0.34V
- b) 0.68 V
- c) 3.4 V
- d) 6.8 V
Q.7.
The NMOS transistor in source follower circuit shown has gm = 5mA/V and a large rFind the output resistance.
- a) 0.1 kΩ
- b) 0.2 kΩ
- c) 0.3 kΩ
- d) 0.4 kΩ
Q.8.
The NMOS transistor in source follower circuit shown has gm = 5mA/V and a large rFind the open-Circuit voltage gain.
- a) 1 V/V
- b) 2 V/V
- c) 3 V/V
- d) 4 V/V
Q.9.
The NMOS transistor in the common gate amplifier as shown in the circuit below has gm = 5 mA/V. Find the input resistance and the voltage gain.
- a) Input resistance: 0.1 kΩ and Voltage gain: 3.05 V/V
- b) Input resistance: 0.1 kΩ and Voltage gain: 3.05 V/V
- c) Input resistance: 0.2 kΩ and Voltage gain: 3.05 V/V
- d) Input resistance: 0.2 kΩ and Voltage gain: 7.1 V/V
Q.10.
If the output of the source follower in (I) is connected to the input of the common gate amplifier of (II). Determine the overall voltage gain (V0 /Vi).
- a) 1.55 V/V
- b) 3.55 V/V
- c) 5.55 V/V
- d) 7.55 V/V