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# HW6_10 - 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. 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. 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: V GS =4V, I D =6mA; Transistor 2 has DC values: V GS =5.3V, I D =16.7mA For the following hybrid- π equivalent circuit, find the following values: (a) R in (input resistance –ignore the input source, Vsig) (b) R out (output resistance-ignore R L {no load is connected}) (c) midband gain, Vsig Vo in R ~ gs1 v gs2 v sig v out R L R 1k = Ω 2k Ω m1 gs1 g v 1k Ω 2M Ω 3M Ω 1k Ω + +

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