ECE3040_Homework9_Solution

# ECE3040_Homework9_Solution - v , the input resistance R in...

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ECE 3040B: Homework #9, Solution April 10, 2009 Page 1 of 8 G EORGIA I NSTITUTE OF T ECHNOLOGY S CHOOL OF E LECTRICAL AND C OMPUTER E NGINEERING ECE 3040B: Microelectronic Circuits Spring Semester 2009, Homework #9 SOLUTIONS 1. MOSFET: Circuit Analysis (20 points) Find the current I in the circuit on the right if V DD = 10 V and both transistors have V TN = 0.75 V and K’ n = 25 μA/V 2 . Moreover, (W/L) 1 = 25/1, (W/L) 2 = 12.5/1, and λ 1 = λ 2 = 0.05 V -1 .

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ECE 3040B: Homework #9, Solution April 10, 2009 Page 2 of 8 2. MOSFET: Q-Point Analysis (30 points) Sketch the dc equivalent circuit and find the Q-point for the NMOS transistor circuit on the right. Given are R I = 1 k Ω , R G = 1 M Ω , R D = 4 k Ω , R S = 1 k Ω , R 4 = 1 k Ω , R 3 = 10 k Ω , V DD = V SS = 6 V, V T = 1 V, K n = 400 μA/V 2 and λ = 0.02 V -1 .
ECE 3040B: Homework #9, Solution April 10, 2009 Page 3 of 8

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ECE 3040B: Homework #9, Solution April 10, 2009 Page 4 of 8 3. Common-Source Amplifier (30 points) Calculate the Q-point, the terminal voltage gain A vt , the signal source voltage gain A

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Unformatted text preview: v , the input resistance R in and the output resistance R out of the common-source amplifier shown on the right. Assume R I = 1 k Ω , R 1 = R 2 = 2.2 M Ω , R S = 22 k Ω , R D = 18 k Ω , R 3 = 470 k Ω , K p = 400 µ A/V 2 , V T = –1 V, λ = 0.02 V-1 , V DD = 18 V. ECE 3040B: Homework #9, Solution April 10, 2009 Page 5 of 8 ECE 3040B: Homework #9, Solution April 10, 2009 Page 6 of 8 ECE 3040B: Homework #9, Solution April 10, 2009 Page 7 of 8 ECE 3040B: Homework #9, Solution April 10, 2009 Page 8 of 8 4. SPICE Simulation (20 points) Find the Q-point and the signal source voltage gain A v of the amplifier given in problem 3 using SPICE. Please provide a plot of the circuit showing the dc currents and voltages and a plot showing the input and the output signal at 7.5 kHz as a function of time. Assume, C 1 = C 2 = C 3 = 10 μF. Q-Point: (I D = 310 μA, V DS = 5.58 – 11.18 V = – 5.60 V) Terminal Voltage Gain: A v ≈ – 8.2...
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## This note was uploaded on 01/17/2011 for the course ECE 3040 taught by Professor Hamblen during the Fall '07 term at Georgia Tech.

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ECE3040_Homework9_Solution - v , the input resistance R in...

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