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ECEN325SolutionMideterm2

# ECEN325SolutionMideterm2 - ECEN 325 Electronics Midterm Nov...

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Unformatted text preview: ECEN 325: Electronics Midterm - Nov. 1 - 2007 Instructor: Sebastian Hoyos l. (40%) For the circuit shown below assume that Vy = 0.6 V, n=2, VT=76 mV. Do the following analysis. (a) (10%) DC analysis: Find the current ﬂowing through the diodes and the voltage Vo. (b) (10%) Linearization of all the diodes: Find the small signal diode resistance rd for all the diodes. (c) (10%) AC analysis: Use the linear model to find the AC voltage at V0. (d) (10%) Use superposition to ﬁnd the total Vo (DC+AC). Hint: Recall that you need to shut down the other voltage source in each analysis. 1kQ sin(wt) Vo 10V —\.9 A) DC 04M» 93: W» L’%ZW~A ( M \K ’9 1w: no I0 l. \l 9 Q5 0.: l.‘8V ’lwu/ . ﬂ “VT . ’2. LLMV : S "2/ (“5 JL Liwnuxjfww " ’13“ ’ 8 LM A 8 lMA \Jo (9.5 up 0’ [9-S+(K 2. (40%) For the ampliﬁer shown below assume that all the transistors operate in active region and calculate the following parameters: (a) (l0%) Ri (b) (10%) R0 (c) (l0%) G=Vo/Vi (d) (l0%) If a peak voltage swing of l V is required at V0, use the linear gains to ﬁnd the peak voltage swings at E3. Cl, C2 and BQ. VD VD R31 Rs . Vo Vl 92% "At A4+ALA31M (Wm. ll m2: 2 /n A1 "WWW/(R4 RENE!) .. = l m + £6; 3: 263 //QC¢H/ (rug+(F§’ﬂ> £165) RE"; ‘ZC4 [/(Yrr§+({7§+(>yrEg 4’ We: ow QC4//<V“g + (pwﬂes) // 1L6: //( (<13 + Mal/M4 P++I {€4,4- VC": AwA4+A2A3 A1 141A4+A1 A3 3 A‘!A4+ALA3 V02 : \Igz: QC), F744 ) 3. (20%) Find R0 in the circuit below using the small signal model shown for the BIT. (a).(5%) Find R0 for the case rce = 00. (b) (l5%) Find R0 for a ﬁnite rce. avg/0h”, {WV VQ 3 \H’ e, V; —: Ya ‘ J, ,QB‘I’“ I (ﬁrka K6 7 WW“ Vac VT we. : W \ I ._.__ “~4— _ ca<ﬁr+m+PVe 3M MWWBJH VT _ 4mm x (cc L/+“‘+7W\ l+ (VM'KE [Le > 44L \[T (Male 16 a :1, \‘rVu, 'gﬁmm *Lfﬁm) hrf¢\$ BE (,GIMM «Ho: (7+3? VT AM K0: M “ ‘ \ 11' 4r T writs 9 _. M...“ Yvr'HlG : Q/Wfp/g>/(Q,E-[H‘VC¢< «LéEJVﬁw‘D ...
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