Quiz 11 for Analog Electronics | ECE 3050, Quizzes of Electrical and Electronics Engineering

Download Quiz 11 for Analog Electronics | ECE 3050 and more Quizzes Electrical and Electronics Engineering in PDF only on Docsity! ECE 3050 Analog Electronics Quiz 11 July 25, 2008 Professor Leach Name Instructions. Print your name in the spaces provided. Honor Code Statement: I have neither given nor received help on this quiz. Initials The figure shows what is called a “phase splitter.” It is given that IE = 2mA, r0 = ∞, VBE = 0.65V, β = 199, α = 0.995, rx = 20Ω, VA = ∞, VT = 0.025V, RS = 5kΩ, R1 = 200 kΩ, R2 = 91 kΩ, RC = 4.7 kΩ, RE = 4.7 kΩ, RL = 2.2 kΩ, V + = 18V, V − = −18V. C1 = 0.1µF, C2 = 10µF, and C3 = 10µF. Equations: β = α/ (1− α), α = β/ (1 + β), IC = αIE = βIB, rπ = VT/IB, re = VT/IE, r0 = (VA + VCE) /IC , rib = r0b = rx + rπ + (1 + β)Rte, rie = r 0 e = (Rtb + rx) / (1 + β) + re, ric = (r0 + r 0 ekRte) / [1− αRte/ (r0e +Rte)], and fL ' ¡ Σf2p − 2Σf2z ¢1/2. (a) By the method of short-circuit time constants, solve for the worst case time constant for C1. Denote it by τ1. What are the corresponding radian and Hz pole frequencies? (b) For the vo1 output, solve for the worst case time constant for C2. Denote it by τ21. What are the corresponding radian and Hz pole frequencies? (c) For the vo1 output, solve for the worst case pole and zero time constants for C3. Denote them by τ31p and τ31z. What are the corresponding radian and Hz pole frequencies? (d) For the vo2 output, solve for the worst case time constant for C3. Denote it by τ32 What are the corresponding radian and Hz pole frequencies? (e) For each output, which pole dominates in determining the lower cutoff frequency fL? You do not have to calculate fL to answer this. 1