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Exam1_Spring2005

# Exam1_Spring2005 - ECE 3042 Lecture FRIDAY FEBRUARY18 2005...

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- / ECE 3042 Lecture Exam No.1 Spring 2005 FRIDAYFEBRUARY18, 2005, 2 PM GTID No. 9- Name ~ Totally Closed Book and Note. Calculator Permittea.. Four Equally Weighted Problems. All Work Must Be Shown for Credit. 1. Shown below is a single stage common emitter amplifier using an 2N3904 NPN BJT as the active device. Design the circuit so that the dc collector voltage is 10 V above ground and the dc emitter voltage is 2 V above ground. The design specification for the magnitude of the small signal midband voltage gain (lilo/Vi I) is 7.3. For the design calculations assume that the base-to-emitter dc voltage drop is 0.65 V, the dc current in RBI is 12IB, /3 = 173, the base spreading resistance is zero, the thermal voltage is 25.9 mY, and the Early voltage is infinity. Determine the values of the resistors RBI, RB2, Rc, and RE2 to satisfy the design criteria. V 1 I ~ AI...t2. \' e.:. -:z. -r t L rrz. Tf- .::. ~ ::. 1.33 ~ I,S V+=15V I Co2. 0{ IE 2- R<.2. IS- 10 <-- [, J 2(; 3.(7~ \Av\-= ~ R <- II RL. ~ T CE 100", ~ r e + (1rztl! r?e: 7- -V R ~ '2- ;:. 5" 2..fL D. '5 + l, S ( 1,11) . 11 - ':::, z. 11.. 'V' YJ.. \2 <..I,3'2(,J - 1/3 IS - [O, bS + 1,5 (U3)] - ~--- ...:- 1'h1A ,J (,)z6 -- ]13 R ~l - R~2.. I Rc I RBI ~ RE2 I 3/77~ 2f!, ~~ ,?~ 5'B2.~ ;; 5 5 S '5 ~ \.J2.t:, V+ I RB2 - R C y. C 1 '¥ J.{)7,. I P2¥ I C -= RB1 1 RE1 -= 1.5k \2 C2 --0 Yo 10 J1-F .> R L 22k \2 R E2 -=

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2. In the circuit shown below determine the voltage Vo and the currents [1, [4, and h. Assume the op amp is ideal. The component values are £1 = 800 mY, £2 = 200 mY, R1 = 200 k!1, R2 = R3 = 1 k!1, R4 = 6 k!1, and R5 = 12 k!1.
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