# q3soln_09 - E ( (A Name & ID: November 13, 2009 EECE...

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Unformatted text preview: E ( (A Name & ID: November 13, 2009 EECE 254 (Section 101) — Quiz #3 1. For each of the circuits below, determine the value of ﬁ for the transistor. (51) +5V +SV 200m lkﬂ ‘—.-" : "*‘SV— SV : 3v e _ It“, .- ZWA : ('23 T 0 o E) fir—R" O OZISMAA (b) . v-11, :— OlOl-Wt’i +5 V 1 mA 5'0 2. Consider the following amplifier circuit where the BJT is characterized by ﬂ: VA = <73 and VBE = 0.7 V when the EBJ is forward biased. (a) Is this amplifier a common-emitter, common—base or common—collector configuration? State one useful feature or application of such a configuration. "gt-7224.1 C Difﬁm I? 760 Newer/’43 Web/m, WW We. (b) Determine the DC bias currents I 5, 1C, and [3, given that the transistor is operating in the active mode. KVL —> lov :2 .th (20kg) + 07V. + ([+{3>Ig(to kg) 0 - m tOV- (WV .. ______————-—.—————A :: IE ZOksM (500016;) W4 Cewici also Ia: 6:8 ; (go-)(o‘orztgwﬁt): 0‘???MA IE : (Heifg : (summers m4) = e. WSW/l 3 (c) Sketch & label an appropriate small-signal (AC) equivalent circuit for this amplifier. Qoui : QC: it tag aergmzzagg We ———————.—-¢; _-———--Cb t5 first (i it t, a I ,3: 5 - e C’. . o ,. swim L .. 4? é.” :— w-LT é,— a;- T—P—g: ' ~fl'f-r ' ream 2?,‘731 fw— VT 35.02% (C!) Determine the voltage gain Av = two/v5, the current gain Al- = felts, the input resistance Rm and the output resistance Rom. «a : ﬂit/Manna.) 4~ «rte = w; Creme) __, (no Av ' N; -‘ .39ng 333i<1 0.02¥§I<-sz 2193; “r5 (0.26 k52— )+ (0.0231?st : Hit ‘//\/ A~ _ to m sis/at, = (M \//v2(2SO2+2?.s?sz)_032S 1 " 4— ‘ _ _ _ . 1g, rag/(\$235+ RM) (laksz) M4 3. What is the (approximate) maximum amplitude of vs that this circuit can amplify without significant distortion in the output waveform? Briefly explain why distortion occurs for signals that exceed this value. \[fﬂmmﬂ 1“ SOMV gamma :1—33 i/Q\MMW‘ 73%” W, W6 h Mg? M Maclcl : ‘ ht I Lg Solved usma, Q I ‘ n 050 QC) Thlj CG Es ..__ v 1L ~L .t, V (V0 ) : 900(EC 3m V : t \T U ' “(:3 03:2/V)(3‘33kd2)[(2§0ﬁ)( (.2503) : “.7 V/\/ Vbe Vbe ‘ ‘ " V V 1— _~ I Vo/QL '5 ‘ (cam be to ~ [0 V0 /RL .. ..—— I ~— -- V0 l — Vbe '5 ‘Vbe(gm+RE+rn) I (3s.ob’mA/v)(3.33kn) So 5 - ANN 0’: “(192.0142) ([0sz “(3305?” (I 42 __L Fr: )f' , “'l ' +**~‘)] TSStOXmlg/V (“01%) gm (EC/HQ.) —L A. RL(9M+EE +rn : 0.323‘ A/{g Name & ID: 2 (“4 November 13,2009 EECE 254 (Section 102) — Quiz #3 1. For each of the circuits below, determine the value of ,3 for the transistor. ~.— *SWOFW : (JOHZM (a) s, is 2‘30 ks; 3v i(2k§~ 1.2m 0 (5: IC 2.51/1/1/4 -; 4. Q. 4: < l i 93 Q to E 2:. (b) "’ : +5V +5V B IE ; (up) 1.3 = W1 5 4V 1 mA ’J —5V 2. Consider the following amplifier circuit where the BJT is characterized by [3 = 100, VA = 00 and VBE = 0.7 V when the BB] is forward biased. +10 V + VCC _VEE (a) Is this amplifier a common-emitter, common—base or common-collector configuration? State one useful feature or application of such a configuration. Gamma“; {War {CW7 @170 W 5 26a 7me WZXW/ M5046 304M 444374. (b) Determine the DC bias currents 15, 1C, and 13, given that the transistor is operating in the active mode. KVL ~P lOV = I15<Zol<sz>+OJ¥V+ (Hﬂig (wk-32> 0- ; lOV~0f¥V : 9'05 '3 Zoksz+ («DOUG/<32.) M aLSo EC :15 3 '5 0.903;»:4/4 use T'Mod€/\ jg ; ([+ﬁ)IB : (lolxéfow) ; 0‘ CHZMA (c) Sketch & label an appropriate small-signal (AC) equivalent circuit for this amplifier. (d) Determine the voltage gain Av = vo/vs, the current gain A,- = io/is, the input resistance Rm and the output «a : "awe 6%” Rt) .4»— «55¢: AI; (Rama 0.5:qu {23* Ar “Ar—‘3 3 - CagtzmA/x/lez talks) 2.43 ks; 5 (2k9)+ (2,43 ksi) \ 5 '33! l W A, :0. : LRL : (W): 44% £\$ /(Rs* Rim) \0 k5?- 3. What is the (approximate) maximum amplitude of vs that this circuit can amplify without significant distortion in the output waveform? Briefly explain wh distortion occurs for si nals that exceed this value. f t/ ., ég/t/r , \dewlxﬂ {Y SMV-s W;(Ma)0\ (O__55) 0‘1 Mamas \$in Emma 2:156 M WWI m 4W-A4?}%¢/ resrstance Rom. ...
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## This note was uploaded on 02/02/2010 for the course ECE EECE 254 taught by Professor Robinturner during the Fall '09 term at The University of British Columbia.

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q3soln_09 - E ( (A Name & ID: November 13, 2009 EECE...

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