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Solutions for Exam1_pdf edition_

# Solutions for Exam1_pdf edition_ - 1(6 points Consider an...

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Unformatted text preview: 1. (6 points) Consider an ampliﬁer circuit below, gm = 30mA/V. Calculate the voltage gain (AV = vo/vs), current gain (Ai = io/is), and power gain in decibels (Ap=po/ps). S gva l M1147 ’4" Av (:0an (3&1) x 1% v5 M“, v; (mun/Iain) + mm (lake—70““? 1, tom term and. 9.x ‘4 0‘ ‘87}5Vs v0: «9mm-5m = ~22\125V5 A1r=Vo ~22|15V1 Vs M f» A; L.= em = ‘wMA/V'Vx ~ '0' Ls= 17* -.~ " 2 (9.463 x6317, 90km.” 31m. 2304?“). i x i - '3 v " AL ‘ no 3 30x10 X a "69234 A/A s o 933xﬁ9‘0} MHZ/0' A? . Answer: I V to ‘ AV: “2‘? « 29 2.30WKD. \i 2.‘5DT9KSZHD§<{L 3 9 (WV) Avg ”La ”5...... % Au-Ac, P5 “Ja Ls A: =M__(A/A) = (~21 32%) (“ml“) Ap= L113) : r34? » 82 W/w AFR“). \0109 (Ml-W32) iAPHBi = 32‘8“?“‘48‘ 2(a) 2. (8 points) (a) (4 points) For an ideal op amp, choose R1 and R2 to get a voltage gain of — 15 V/V and an input resistance of 15 Okﬂ. \IL 1: :: :EZEL. -—:> ‘2‘ :: :EZE_. 2: F? RC" ’ T I " R] C“ m/P‘ ‘ @ ”.83., = "‘5 , 33;, z: \5 P| EUR-CL I2?) 053050 «D = Answer: R1: 150er ZZ‘IO KQ 3(a) (b) (4 points) Find the transfer function, T(s) = vo/vi of the circuit below. : “Bf: («1622+ I) 5E1 R16“ 59* j i) “3* m) : - 3.. (H War-3 P; 0+:ch Answer: _ Y' I +SQ2c’L) T(s) = Vo(s)/ Vi(s) "E. ( 1+ 5mm? 4(3) VA 3. (14 points) For the diode circuits shown below, ﬁnd the values of I and V indicated. (a). (4 points) Using the ideal diode model: V: \/ , 2V V 1:)? / llcﬂ : LSMA Answer: I = S V = 27 \/ V‘2’o‘7l/ V3 0V Vd’éV . 1‘ : 4K5" : (JWm/x 6V IL” ’73:; 7' 0~7§mA €;C) I~ :1 14 ” 1:1 : 0.x7SmA 5(a) VA (c) (6 points) Using the constant—voltage-drop model (VD=0.7V): +1OV 1n Wet/we. \/: gv/oﬂk/t mv \7\ M 0+}— am) v, Ts an, 6(a) 4. (12 points) (a) (6 points) A diode With n = . (i). Find the small signal resistance (dynamic resistance) at 0.7V. (ii). Find the saturation current 15 at room XL [0 : Zg’ CHW xv} ‘ nv ‘ Z5 : 25f. T 0‘79/ / fva-e: )YthmV : LMX/O’é MA in; h ‘7 L [01: is Q, VT AV n V4: 731‘ :Z LC; : Kimmy S 6 KW LWX/Uvjlj ~677gf3/53V ¢2BQ Answer: (i) F1): 11/; ﬂ 7(a) VA (b) (6 points) Consider the circuit shown below. A string of four identical diodes is used so that Vo = 2.8V when IL = 0, and V0 changes by 16 mV per lmA of load current. Assume n=1.8. (i) Find the incremental resistance rd for each diode. (ii) Find the value of R. I———> F? IL ———> r————‘—«m~————————-——————o 4- o~———————— 14v© —— v § Load 2 0 PW :Vf -— lémv " ‘" ,Elw 7L. ( inﬁ\ i6 . \ Y , L63} _. (i " 4k ’ [PSI \-—\ 2: d : .O/ 19 \ 92.8v ‘ ‘2: % : @4456 KL) Answer: (i) rd= [UL (ii)R= 0.2456 EJL . 8(a) ...
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Solutions for Exam1_pdf edition_ - 1(6 points Consider an...

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