ECE102_W07_Quiz3

# ECE102_W07_Quiz3 - and the other resistors are chosen such...

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ECE102 Quiz 3 – Question Pages Winter 2007 1 Student ID Name (Last, First) Score Question 1 (2 + 4 = 6 points): The diodes have n = 1. The input frequency ω is high. Current source I 1 0.28 mA. (a) What is the large signal bias value of v OUT ? (b) Find the value of I 1 such that the small signal gain from input to output is 0.75. Question 2 (1 + 4 = 5 points): (a) Copy the BJT symbol and label the terminals. (b) Find the small signal resistance that is seen between A and ground. 24 Write your answers on the separate answer pages; we will not look at these question pages. C v in (V) = 10 -3 ·sin( ω t) I 1 + _ v OUT D 1 D 2 25 50 1.7 mA 1 k A V DD g m = 0.01 A/V β = 2 r o = 200

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ECE102 Quiz 3 – Question Pages Winter 2007 2 10 V R 3 R 1 R 2 R 4 V 1 V 2 Question 3 (1 + 2 + 4 + 2 = 9 points): (a) What is the name of the biasing scheme shown below? (b) If R 1 = R 2 = 8.2 k
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Unformatted text preview: and the other resistors are chosen such that V 1 = 8V and V 2 = 7V. What operating mode is the MOSFET in? (c) If R 4 = 500 Ω and R 2 = 10 k Ω , find the values of the resistors R 1 and R 3 such that V 1 is biased at 5V and V 2 is biased at 2V. (d) If R 1 = R 2 = R 3 = 10 k Ω and R 4 is replaced by a capacitor of 1 µ F and an initial voltage of 0 V. At t = ∞ (steady state), what is the value of V 2 ? At t = ∞ (steady state), what is the operating mode of the MOSFET? Question 4 (4 points): Find the value of the equivalent small signal resistance R , as indicated below. Your results should be accurate within 1%. V thp = -1 V k p ’ ⋅ (W/L) = 2 ⋅ 10-3 A/V 2 λ = 0 R 1 = 100 k Ω R 2 = 200 k Ω R 3 = 4 k Ω β = 99 r o = 4 k Ω g m = 0.1 A/V R 1 10 V R 2 R 3 v S ~ R ?...
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## This note was uploaded on 05/30/2009 for the course ECE 641158 taught by Professor Curtshurgers during the Spring '09 term at UCSD.

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ECE102_W07_Quiz3 - and the other resistors are chosen such...

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