# HW6sol10 - ECE2280 Homework#6 9V ID Spring 2010 Use the...

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1 ECE2280 Homework #6 Spring 2010 Use the circuit to the right for #1 and #2. Use: V t =2V k n ’(W/L)=4mA/V 2 λ =0 V I = 10+0.002sin(20t) For DC analysis, assume that the capacitors act as open. For AC analysis assume that the capacitors act as shorts. 1. Solve for the DC values: a. I 1, I D, I S b. V G, V S ,V o c. Verify that the transistor is saturated. d. State the DC bias point. ~ 3 C V I + + 2k 3k 4V 2k 1k 4 C o V G V S V NMOS 100m 1m +9V D I S I 1 I in R out R 500 Ω 500 Ω 1.7V

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2 2. Using the values from problem 1. Find a. Vo/V I b. Rin c. Rout d. What is the total (AC and DC) instantaneous output for Vo if V I = 1msin( ω t) where it is operating in the midband frequency range. V o=-g m v gs1 *(3k||1k) v gs1 = V I - g m v gs1 *1k v gs1 (1+ g m 1k )= V I v gs1 = V I /(1+ g m 1k ) g m =4m*(2.7-2)=2.8m V o=-g m v gs1 *(3k||1k)=[-(2.8m)*(750)* V I ]/(1+ (2.8m)*1k ) V o/ V I =-0.6V/V Rin=1k Ω Rout=3k Ω Vo_total=6-0.6msin( ω t) 3. Use: V t =2V, k n ’(W/L)=3mA/V 2 , λ =0 (for all transistors), V sig is an AC source Transistor 1 has DC values:
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## This note was uploaded on 01/24/2011 for the course ENGR 3700 taught by Professor Kal during the Spring '10 term at Utah State University.

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HW6sol10 - ECE2280 Homework#6 9V ID Spring 2010 Use the...

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