hw2 - , and the common-mode input voltage is zero ( V ic =...

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ECEN 326 HOMEWORK #2 ( Due date: Monday, February 15, 2010) 1. In the following circuit, all transistors are identical with β = 100 , R 5 = R 6 , V A = , V T = 25 mV , | V BE,on | = 0 . 7 V and | V CE,sat | = 0 . 2 V . Common-mode input voltage is zero ( V ic = 0 ). (a) Find R 5 , R 6 , R 7 and R 8 to have the maximum symmetrical swing at V o + and V o - . (b) Draw the AC-equivalent differential-mode half circuit, and find A dm and R id . (c) Simulate the circuit using PSPICE (use ideal current sources for Q A Q C ) and submit all necessary plots showing that your results are verified. Q C 10 R 3 10 R 4 Q D 920 R A Q A Q B 500 R 9 Q 5 R 8 Q 6 200 R 1 Q 1 Q 3 200 R 2 Q 2 Q 4 Q 7 R 5 Q 8 R 6 R 7 -3 -3 0 -3 -3 -3 +3 V i + +3 V i - +3 V o + +3 V o - +3 2. In the circuit below, R 1 = R 2 , k 0 n = 100 μA/V 2 , k 0 p = 50 μA/V 2 , V tn = 1 V , V tp = - 1 V , λ n = λ p = 0 . 1 V - 1 , χ = 0
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Unformatted text preview: , and the common-mode input voltage is zero ( V ic = 0 ). (a) Find R 3 to have I D 6 = 500 A . (b) Find R 1 to have the maximum symmetrical swing at V o + and V o-. (c) Draw the AC-equivalent differential-mode half circuit and nd A dm . (d) Draw the AC-equivalent common-mode half circuit and nd A cm . W=10u M 9 L=1u R 3 M 1 W=80u L=1u M 5 W=40u L=1u M 6 W=20u L=1u M 8 W=5u L=1u M 2 W=80u L=1u W=20u M 3 L=1u W=20u M 4 L=1u R 1 W=10u M 7 L=1u R 2 V o + V o--5-5-5-5 V i + +5 +5 V i-...
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This note was uploaded on 03/08/2010 for the course ECEN 326 taught by Professor Karsilayan during the Spring '09 term at Texas A&M.

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