EE 40 - Spring 2004 - Sanders - Midterm 2 solutions

EE 40 - Spring 2004 - Sanders - Midterm 2 solutions -...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EECS40 _ Spring 2004 Midterm Exam # 2 April 15, 2004 Time Allowed: 80 minutes g olA/fi-t‘m Name: , Last First Student ID #: , Signature: Discussion Section: This is a closed—book exam, except for use of two 8.5 x 11 inch sheets of your notes. Show all your work to receive full or partial credit. Write your answers clearly in the spaces provided. EE40‘mt2_SO4.fm a) (5 points) A silicon sample is uniformly doped with Boron to a concentration of 1016 atoms/cm} Determine the resistivity of the sample at room temperature. Use electron mobility : u" = 1000 cmzfy—s, hole mobility = up = 400 cmglv-s, q = 1.6- 10—]9 C and ni = 1010 at room temperature. lb : 10 b3 _ [5 .. N0 W (3"[0 Cm; >> m‘ Pal”pr -. t“ "‘r ' ‘ “.119”? beto'”(; r{o“01n'3.c4aooh%_s 2 0.54 31‘0" b) (5 points) :: LS6 Jb om The same sample is then to be counter doped to a depth of 5 pm with Arsenic atoms to create a resistor technology with resistance of 1009/ II]. Determine the required Arsenic doping density. ,2 Rs:’[‘: F " awn-t am " a?th " €<'W"\l>f"" N \J I i ‘ g; :2 h = ‘3 W 0‘ 0‘ (Ext/[,1 {V M, #0432 .a IUWOMX/u: * 0.051242% 17 —; EE40_mt?._SO4.fm ideal rectifier iL(t) l L _9 - - - - —-+1 __’___‘__‘__Vsm . 12:19 ----—10V 4————> T = 1 1118 Figure 2(3) 3) (10 points) The diode in Figure 2(a) is ideal. The waveform V30) is a balanced square wave with amplitude of 10 V and period of 11118. Take L = 50 pH and R = 19. The circuit operates in a periodic steady state. Sketch and carefully dimension one period of the iL(t) waveform on the axes below. Make reasonable approximations. L 'C':—-—-—-:0.ow.;' R ’i 0-9? 1; t O_ {"1 5 3 {MS EE40_mt2_SO4.fm b) ( 10 points) Figure 2(b) In the circuit of Figure 2(b), switch SI is initially closed and the circuit is in equilib- rium. Switch 81 is then opened and switch 82 is closed for a sufficiently long time so that the circuit can be considered to be in equilibrium. How much energy is dissi— pated in the le resistor during the transient? Hint: Think in terms of net charge and energy flow. Detailed transient analysis is NOT needed. changed in Wad” . r 5N0: EL cvzz ~ 3; cvf : El attain/)4»- 23W") : \[2 C C’Vz— CV1) U... '2: £- J‘IO“ A Energy dn‘rs:}n+ai u'n pesl'sfm— EE40_mt2_SO4.fm 3. 120M; 1) — US + 0 M1 VG A = 0.1V’1 VT = 0.5V Figure3 kl = lOOpA/V2 W L — 2 . . . . _ 1 'W 2 A . . . MosfetMl 1nF1gure 3 is modeled by 1D — 5k 1-(DGS— VT) (1 + DDS) 1n saturation With parameters listed in Figure 3. a) (5 points) Determine the requires bias voltage VG so that M1 is biased in saturation with VDS = 2V. Take '05 = O for this calculation. .. ,w. L (It): 1); I" T: (was'V-r) (“10?”) pop/wit =— 3? x WON/4%: x 2 2" (v05 — 0-SV)1C 1+ c.1v"»2v) EEtwithLSOdfm b) (10 points) Draw the small signal model for this circuit. Compute the parameters of this small signal model. «~43 K G.) U} a h {Jig 3‘ “Q'- a ’ .. ...L— r." jo at? a»? p = W—EWag—wrw—rN/p‘u : {WIMA/V: x2 1Kl«5V"l\.f)( H- 0*lVHI’2V) : 2.4 Ho"? 3 - .11 c _|_ CE 2 3°“ >03; 1k L(UZA$”VT)-A, .. l , “ 3 “MFA/U: *2 ‘(JJ'V’lfo 0.1v' c) (5 points) 2 {0'5 9 1) Determine the small signal gain A0 = D—0 . s Av: EL -_- _ 3h 2‘4— ’Uohqv—S fl 2 b :: "2 Us 30 {Ojg 4 EE40_ml2_SU-1.frn ...
View Full Document

Page1 / 6

EE 40 - Spring 2004 - Sanders - Midterm 2 solutions -...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online