110b-mt-2007

110b-mt-2007 - A3 1 20 pts Consider the small—signal...

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Unformatted text preview: A3 1 20 pts Consider the small—signal high-frequency AC equivalent circuit for an amplifier i shown below. Find an approximate equation for cocH using either open— or short- circuit time constants, Whichever is appropriate. Do NOT use the Miller approximation. Explain how you arrive at your answer or you will not receive full credit. More room is available on the next page. l Zk*2;a uMWWmWoXu-Mm‘) W 05c ogm«&fi't3J +um, axfix =Q a, i taming; W )Fu‘vlol {2b : 05:. +142. aplf‘l‘ ‘sodf’az. ‘l’ravt5~l>&$-M‘Jcioh) gals 1153.23 5043 Hm; Lll‘fiul‘l’ as shown . A4 Additional space for problem 1. final 22;): 03:. +141: $915+- $5~>ufi2a 4+M$¢srm 4.0 gmL +446, dram-k shown a Q h V” K as _' ,——~ A5 2 10 points Consider the cascode amplifier shown below. VCC 5 pts (a) Draw the small-signal low- R E g R frequency AC equivalent 1 C Cour circuit. Ignore rb and r0 in both CB *—i V transistors and label all model A fii HQZ RL elements (you do not need to — provide equations for them). R2 g 1— Use the hybrid-7t model for Q1 and the T-model for Q2. W\/ | E . [:Q1 5 pts A6 (b) Draw the small-signal high-frequency AC equivalent circuit. Ignore 7’01 a r02 and rbz and label all model elements (you do not need to provide equations for them). Use the hybrid-7: model for Q1 and the T-model for Q2. A7 3 25 points Consider the amplifier shown below. We want to design this circuit to achieve a maximum symmetric swing of 2 volts at the output. Assume that VCC = 10 V. VCC V0 5 pts (a) Assuming (just for this part of the problem) that fl; is infinite, what is the maximum DC bias voltage we can use at the collector of Q1? Explain how you arrive at your answer or you will not receive full credit. r I'- l - \ {32"‘0; =§ (8)2" WC?) $0 PP Qt (ya—PS 0Q?) Dc\—3 \fcg . Ifl epdem “it: “we.” @ POSat‘f‘l #14:; fiwi’né an"? aiv 4+ {2957 70c $44.37? 39 2V (U5; ) pol/dc, A8 5 pts (b) Assuming (just for this part of the problem) that V51 = 2 V and VCESAT = 0.2 V, What is the minimum DC bias voltage we can use at the collector of Q1? Explain how you arrive at your answer or you will not receive full credit. A m, U mg» lac, ma, +3 Mm. Clam 107 a ,1 Ci 6 4+ 2U, ‘30) Knot/Q 0C4 é; VE‘+\[CE -_4 223V A SAT 0‘ Min : Lil-av Cl M A9 15 pts (c) Derive an equation for the absolute minimum DC bias current that must be used in Q2 as a function of RE and RL. Explain how you arrive at your answer or you will not receive full credit. :4: 62‘ éociul‘a‘ii’la CEMMFH¢$ Womb/r ) “Hot/m IE; 75 iii/em, H— has +5 195, To Qantas, LELMM regards JFWA— vow/1 6 +VEZuw U 5 {I } QMH/I v :1 “Z. 2 “VEL' QL“ 0”" RE; EL. Q5291?» 2' “2-” 6R 2 "‘ :52, EELEL. Iain/win -— 2‘ A10 4 20 points Consider the negative feedback amplifier block diagram shown at right. 4 pts (3) Derive the equation for the closed- loop gain of this system, A f = §£ , in i terms of a and b. Make what you are doing clear or you will not receive full SD: (153$: a($;~‘3,c): alsr-bgé) $D<Hal7> :Gkgc‘ credit. ‘ “so I a A?“ $5 Maia §g> V 4 pts (b) Derive an equation for the error signal, Se, in terms of a and b. Make what you are doing clear or you will not receive full credit. San SLV$¢ 1 gé’bgo Z "alfiga ( A11 12 pts (c) Assume that the forward amplifier v0 has the large-signal static transfer characteristic shown at right and that b = 0.2. Draw the resulting closed—loop large-signal static transfer characteristic on the axes below. Label all slopes and breakpoints. Explain how you determine the slopes and breakpoints for your plot or you will not receive full credit. ...
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This note was uploaded on 06/28/2008 for the course EEC 110B taught by Professor Spencer during the Spring '08 term at UC Davis.

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110b-mt-2007 - A3 1 20 pts Consider the small—signal...

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