Monday, June 8, 2009
Answers to Fundamentals of MicroElectronics - Preview Edition Chap 7
I worked out these answers and have posted it for others to compare it against theirs. I welcome constructive discussions on the answers.
Sunday, May 31, 2009
Answers to Fundamentals of MicroElectronics - Preview Edition Chap 5
I worked out these answers and have posted it for others to compare it against theirs. I welcome constructive discussions on the answers.
2-a-(1/gm)+R1
b-(1/gm1)+(R1||(1/gm2))
c-(2/gm1)+(R1||(1/gm2))
3-a-R1+(R2||Rpi1)
b-R1||(1/gm1)
c-Rpi1+(beta1+1)*(Rpi2||(1/gm2))
4-a-R1||Ro1
b-Ro1
c-Ro1(1+gm*(Rpi||Ro))=2*Ro1
d-beta*Ro/2
5-a-R1||Rpi
b-1/gm
c-2*Rpi
d-"
e-Rpi2
6-a-Rc||ro
b-2ro1
7 a-1.75mA
b-1.035mA
c-too lazy to work out this one
11 a-7.04kohm
b-1.77V
12 a-4.03aA
b-7.04aA
13 52kohm,24kohm
15 (R1||R2)||(beta*Ro/Ao)
16 3kohm,4.32kohm
4.63
17 20.24kohm
18 .68mA
19 1.59mA
20 75kohm
21 .13pA
22 .744V
23 65kohm
24 1.41mA
25 2.45mA
26 1.47mA
.67mA
28 3.66mA
.75mA
30 9.6kohm
31 3.17kohm Re is haloved =>closer to saturation
32 13.9fA
33 Vbe*(1+R2/R1)
34 10uA
Vdd>1.3V
35 55.8
36 .125mA
37 20
38 a->-1,Rpi,1/gm
b->-gm*(R1+1/gm),Rpi,R1+1/gm
c->"
d->-1,Rpi,Rpi/(beta+1)
e->-(1-gm*Rc),Rpi,(Rc+Rpi)/(1+beta)
39 a->-1,Rpi,1/gm
b->-gm*(ro||(R1+1/gm)),Rpi,ro||(R1+1/gm)
c->"
d->-gm*Rout1,Rpi,Rout1=((Rc+ro2)/(1+gm*ro2))||ro1
e->-gm*Rout1*(1-gm*Rc)*ro2/(ro2+Rc),Rpi,ro1||((Rc+Rpi)/(beta+1))
40 2.5 %
1.25%
41 -3.3
42 .69mA,2.4kohm,24kohm
44 -Rc/((Rb/beta)+(1/gm)+Re)
45 Rc
46 a->-(R1+1/gm)/(Re+1/gm),rpi+(1+beta)*Re,R1+1/gm
b->-gm*Rc/2,2*rpi,Rc
c->"
c->"
d->-Rc/(2/gm+Rb/beta),Rb+2*rpi,Rc
e->"
47 a->-(rc+1/gm)/(Re+1/gm),rpi=(beta+1)*Re,Rc+1/gm
b->-1/(gm*Re+1),rpi+(1+beta)*Re,1/gm
c->-(gm*Rc+1)/2,2*rpi,Rc+1/gm
d->-(Rc||rpi)/(1/gm+Re),rpi+(beta+1)*Re,Rc||rpi
48 beta*ro
49 a-2*ro
b-ro*(1+gm*(rpi1||(rpi2+Rb)/beta))
c-ro*(1+gm*(rpi1||R1||rpi2))
50 2*ro
beta*ro
51 rpi
52 a->-8.6
b->-21.1
c->-12.9
53 -63.46
54 a->500ohm
b->(Vcc-Vb)/Ic
55 a->(gm*Rc+1)
b->gm1*rpi2
c->(gm*Rc+1)
d->(gm*Rc+1)*Re/(gm*Re*Rs+Re+Rs)
56 a->1/gm1+1/(beta*gm2)
b->1/gm1+R2/beta1
c->1/gm1+(R2||1/gm2)/beta1
d->1/gm1+(R2||rpi)/beta1
57 gm*ro
58 23.7ohm,,1kohm
59 71.9ohm,1kohm
60 gm1*(R1||1/gm2),1/gm2,R1||1/gm2
61 gm1*R1,1/gm1,R1
62 ro/(Rs+1/gm), Rs+1/gm,ro*(1+gm*(Rs||Rpi))
63 1=2*2
64 (Rc/Re)*(1-gamma)/(1+gamma*Rc/Re) -> gamma=(ro||(rpi+Rb)/(1+beta)||Re)/((rpi+Rb)||Re))
65 1mA
66 2.6mA, 90ohm
67 8.3mA
68 1,infinity,1/gm
0.5,2*Rpi1,1/(2*gm)
(1/gm+Rs/beta2)/(2/gm+Rs/beta2),2*Rpi1+beta1*Rs/beta2,(1/gm+Rs/beta2)||(1/gm)
(Re+1/gm)/(Re+2/gm),2*Rpi1+beta1*Re,(Re+1/gm)||(1/gm)
(1/gm)/(2/gm+Re),2*Rpi1+beta1*Re,(1/gm)||(Re+1/gm)
69 2*beta1*beta2/gm
2/gm2
beta1+beta1*beta2
70 ro2(1+gm*(Re||Rpi))
1,Rpi1+beta1*ro2*(1+gm*(Re||Rpi)),1/gm
71 1.6mA,.845
72 Rc||ro2
-gm1*gm2*(Rc||ro2)(Re||ro1||Rpi2)/(1+gm1*(Re||ro1||Rpi2))
73 Rpi1+beta1*(Re||(1/gm)),Rc
gm1*gm2*Rc(Re||(1/gm2))/(1+gm1*(Re||(1/gm2)))
74 1kohm,10kohm,3.2uF
75 500ohm,40.6kohm,81.9
76 1kohm,343.3kohm
77 2kohm,40kohm
78 (Ao*Vt)^2
79 250ohm,89kohm
80 500ohm,92ohm,3.6k,4.4k
81 1k,102.5,7.95k,5.41k
82 620.8,110,8.5k,5.8k
83 1.1k,550,32.5k,22.98k,2.8uF
84 500,625,36.8k,26k,2.5uF
85 200,3.25mW
86 143,143,8.2k,6.14k
87 1.1k,550,11k,23k,1.5V(edge of active biasing)
88 22k
89 234ohm,153.4kohm
90 500ohm,34.1k,3.9uF,5nF
91 edge of active mode,46nF
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