Exam1_solution - SOLumoMs NAME: EE/CE 3311 Electronic...

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Unformatted text preview: SOLumoMs NAME: EE/CE 3311 Electronic Circuits uiz #1 02/10/10 Allotted Time: 1 Hour 15 Minutes * This test is closed notes, closed HW (solutions) AND closed book. One one-sided sheet (letter size paper: 8.5” x 11”) of notes/formulae is allowed. Do not begin until instructed to do so. If you need more paper use the back of the pages and ask the instructor. Be sure your name is on your test. Please show all your work to ensure getting full credit. Please underline or box answers where appropriate. Label answers with appropriate units. * Good Luck! Useful numbers to be used unless specified otherwise: k= 1.38 x10"23 J/K, 1 eV = 1.6 x10‘19 J, Eg,Si = 1.12 eV [0 For Silicon, u.“ = 1350 cmz/(V.s), up = 480 cmZ/(Vs) I (1],; Z 7—: 3 00k): \- 0 q a; kw? . e us V110,l = 800 mV (for a constant voltage diode model) M“ ‘1 '5’ ,3/ v ~ ,— “s .4. ~, 92 XW . l L exp 933T alums/Cm V1 7/ (Lb WA/ U11, Problem #1 15 points} A pn junction employs the following doping levels: NA =r :10l6 cm’3, ND = 1.25 x 1015 cm'3. Determine the hole and electron concentrations on the two sides. 69441.. (1k P’§;&e.u “0 -3 [kt Q; NA : H) cm (L 1» l {0 -3 Lf -3 M10 CL 1‘; : (1-ogxzo cm) a M X“, Can “A fife? We fl. AM A” Side ,3” *3 M 4‘2“; X ‘0 Cm mm % D ‘W/ L 7. {06:7 *3 m ,A. : 00931:! : 6’: / ’f" WEE“) Problem #2 (5 points) Plot the input/output characteristic for the circuit shown below. Assume a constant-voltage model for the diode D1. “)1”... VM. we - 0° D1 (W5C"Ve) ASSIMMQ 0, :OH Vln R Vout Vault :JQJW V 2 2.1% ‘“ R1 D1 Ws'Oh’ WK ‘4 ML T +v¢ W‘We- HAW ’- V910” , V Jim 2.926 (it 7 VM _v%+Vp,on /,... E4 rv- ~v 11,21 , M w: Kn.— “ QM: [MIL ‘ K7... R[3l0n7 (2”? qu W2 me c M" t m V 01V V"VD . : v —, lam 2L” 1.4% V»;-i..’?”,i, ‘3' W W W». (22 " a: ~ J—r x In .— V a r y [La u) M ~ \/ .904 2?, : “if : ~9’ Ms Ii ijiy’ 92:06“ Vmut = 0 VNL: «av: Wop}: My}; like» :2 KL) Problem #3 (10 Points! A diode operates in the forward bias region with a typicai exponential current level, i.e., ID = Isexp (VD/VT). (a) If we wish to increase the current by a factor of 10 at room temperature (T=300 K). How much change in VD is required? (b) By what factor does the current change if the voltage changes by 120 mV? \fb * VTLAE :4 - 101]) 3:5 '3) W 1B1 E 1 2 V L J , V 11M J: T :5 , T I$+ V‘TflM/lo :3 VIP/1, v 4,. 60 MV is M m “>4 = 12:321. 195/9 ‘" (333’ V D ‘ v + ’1me D: :86)??? 1 I92“ IgWLD VT ) v N D/OW‘V 1 S xi) VT % H0 %M\/ Problem #4 115 Points! While constructing a full-wave rectifier, someone mistakenly has swapped the terminals of the diode D3, as depicted in the figure below. Explain what happens to the output voltageif you give a sinusoidal input voltage. Draw the output waveform. Problem #5 115 Points} Plot the currents flowing through R1 and D1 as a function of Vin for the circuit shown below. Assume constant-voltage diode model. ...
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Exam1_solution - SOLumoMs NAME: EE/CE 3311 Electronic...

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