q4_2009

# q4_2009 - Section 1 Module 4 Quiz 1 What is your name(5 2...

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Unformatted text preview: Section 1 Module 4 Quiz 1. What is your name? (5%) 2. What is your student number? (5%) 3. The MOSFET in the circuit below has Vt= 2 V, µn Cox W/L=1 mA/V2, and VA=100 V. a. Find the values of RS, RD, and RG so that ID=0.2 mA, the largest possible value for RD used while a maximum signal swing at the drain of ±1 V is possible, and the input resistance at the gate is 1 MΩ (20%). b. Sketch and label the small‐signal (AC) equivalent circuit for the circuit and determine the voltage gain from signal source to load if terminal Z is grounded, terminal X is connected to a signal source having a resistance of 1 kΩ, and terminal Y is connected to a load resistance of 400 kΩ (20%). 4. Design the circuit below so that the transistor operates in saturation with VD biased 1 V from the edge of the triode region, with ID= 1mA and VD= 3 V, Vt= ‐ 1 V and µn Cox W/L=1 mA/V2. Specify the values of VG, VD, VS, R1, R2, RS, and RD (30%). 5. Draw the equivalent small‐signal model of the following circuit. Calculate the circuit gain based on ro1, ro2, ro3, gm1, gm2 and gm3 (20%). This page has been intentionally left blank. Section 2 Module 4 Quiz 1. What is your name? (5%) 2. What is your student number? (5%) 3. A common gate amplifier is connected as shown below, with RD= 4 kΩ, RG= 1 MΩ, RL= 4 kΩ, RS= 100 Ω, VDD= 10 V, and VSS= ‐10 V. All MOSFETs have VA=1/λ=1000 V, and you may ignore the body effect. Q1 has µn Cox W/L=2 mA/V2. The capacitors are very large, and I= 1 mA. a. In what mode of operation is Q1 (10%). b. Find gm and ro for Q1 (10%). c. Draw the small‐signal schematic of the circuit (10%). d. Find the circuit gain (10%). e. Find the values of Rin and Rout, the input and output resistances of the circuit (10%). 4. Draw the equivalent small‐signal model of the following circuit. Calculate the circuit gain based on ro1, ro2, ro3, gm1, gm2 and gm3 (20%). 5. For the devices in the circuit below, Vt= 2 V, λ=0, µn Cox= 50 mA/V2, L= 1 µm, and W= 20 µm. Find V2 and I2 (20%). This page has been intentionally left blank. ...
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