Respostas Alguns Exercicios Sedra

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L-2 Appendix L Answers to Selected Problems
1.59 Voltage amplifier, Ri = 1× 105 �, Ro = 1× 102 �, Avo = 121 V/V
1.64 1025 V/V or 60.2 dB, 2500 A/A or 68 dB, 2.63× 106 W/W or 64.2 dB
1.68 4 MHz
1.70 64 nF
1.73 0.51/CR
1.75 0.8 k�, 8.65 k�, connect 2 nF to node B.
1.78 159 kHz; 14.5 Hz; � 159 kHz
1.81 10 Hz, 10 kHz, 0.04 dB, 0.04 dB, 10 Hz, 10 kHz
CHAPTER 2
2.2 4004 V/V
2.5 40,000 V/V
2.7 0.1%
2.8 In all cases, −5 V/V, 20 k�
2.11 (a) −1 V/V; (c) −0.1 V/V; (e) −10 V/V
2.13 10 k�, 100 k�
2.15 Average = +5 V, highest = +10 V, lowest = 0 V
2.17 ±2x%; −98 to −102 V/V
2.19 1.8 k�; 18 k�
2.21 ±2 mV
2.24 1000
(
1+ R2
R1
)
, 100
(
1+ R2
R1
)
, 10
(
1+ R2
R1
)
; 1000 R1, 100 R1, 10 R1
2.26 (b) 1 k�, 100 k�, 909 V/V
2.28 (a) 10.2 k�
2.32 (a) 0.1 mA, 0.1 mA, 10 mA, 10.1 mA, −1 V; (b) 1.19 k�; (c) −11.1 V to −2.01 V
2.34 (a) 1 k�; (b) 0, ∞; (c) −0.57 mA to +0.57 mA (d) 2.2 mA
2.36 vO = −(10 v1 + 5 v2); −5 V
2.43 12.8 k�
2.44 (a) ∞; 0; (b) 10 k�, 10 k�; (d) 10 k�, 990 k�
2.46 100 k�; no
2.50 2 sin (2π × 1000t)
2.51 1/x; 1 to ∞; add 1-k� resistor between the left end of the pot and ground.
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Answers to Selected Problems L-3
2.53 (a) 10 mV, 10μA, 10μA; (b) 10 V, 10 mA, 0; from the power supply of the op amp
2.58 (a) −0.83 V/V, 17%; (c) −0.98 V/V, 2%; (e) −9 V/V, 10%
2.60 20 V/V, 10 k�, 0.0095 V/V, 66.4 dB
2.64 R1 = R3, R2 = R4
2.65 0.02x V/V; 0.002 V/V, 54 dB; 0.02 V/V, 34 dB; 0.1 V/V, 20 dB
2.67 1 k�, 1 M�, 1 k�, 1 M�; 1% tolerances
2.69 R= 1M�, R5 = 756�, R6 = 6.8 k�
2.73 (a) −0.12 V to +0.12 V; (b) −12 V to +12 V
2.75 Ideal: 21 V/V, 0, ∞; ±1% resistors: Ad = 21±4%, | Acm |= 0.02, CMRR = 60.4 dB
2.77 (a) vB/vA = 3 V/V, vC/vA = −3 V/V; (b) 6 V/V; (c) 56 V pp, 19.8 V rms
2.79 (a) 1591 Hz; (b) leads by 90◦; (c) increases by a factor of 10; (d) the same as in (b)
2.81 1 MHz; 0.159 μs
2.83 R = 10 k�, C = 159 pF; RF = 1 M�, 1 kHz; (a) vO decreases linearly to −6.3 V,
(b) vO decreases exponentially, vO(t) = −100(1− e−t/159), reaching −6.1 V at the
end of the pulse.
2.86 R1 = 10 k�, R2 = 1M�, C = 0.16 nF; 100 kHz
2.88 15.9 kHz, vO = −5 sin (106t+ 90◦) V
2.90 Square wave of the same frequency, 8 V peak amplitude, average is 0 V; 30 k�
2.92 R1 = 1 k�, R2 = 100 k�, C = 79 nF; 20 Hz
2.94 4 mV
2.96 9 mV; 12 mV
2.98 (a) 0.53 μA, into the input terminals; (b) −3 mV; (c) −60 nA
2.100 R1 = 1.01 k�, R2 = R3 = 100 k�, C1 = 1.58 μF, C2 = 0.16 μF
2.102 6 V; 3 V; 9 mV
2.104 (a) 0.2 V; (b) 0.4 V; (c) 10 k�, 20 mV; (d) 0.22 V
2.106 (a) 9.9 k�; (b) 0.222 V
2.108 80,000 V/V, 125 Hz, 10 MHz
2.111 19.61 kHz, 49.75 V/V, 4.975 V/V
2.113 (a) 5.1 MHz; (c) 10 MHz; (e) 10.1 MHz; (g) 2 MHz
2.116 36.6 MHz
2.118 500 MHz; 3; 7 MHz; 3.6 MHz
2.121 100 mV
2.125 1 MHz, 3.18 V
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L-4 Appendix L Answers to Selected Problems
CHAPTER 3
3.1 −55◦C: 2.68× 106 cm−3, one out of every 1.9× 1016 silicon atoms; +75◦C:
3.70× 1011 cm−3, N/ni = 1.4× 1011
3.3 5× 1018 cm−3; 45 cm−3;
3.5 At 27◦C: nn = 1017/cm3, pn = 2.25× 103 cm3;
At 125◦C: nn = 1017/cm3, pn = 2.23× 108 cm3
3.7 νp−drift = 1.44× 106 cm/s, νn−drift = 4.05× 106 cm/s
3.9 9.26× 1017/cm3
3.12 778 mV; 0.2 μm, 0.1 μm, 0.1 μm; 1.6× 10−14C
3.14 1.6 pC
3.16 59.6 mV
3.20 7.85× 10−17 A; 0.3 mA
3.22 3.6× 10−16 A; 0.742 V
3.24 31.6 fF; 14.16 fF
3.27 0.5 pF; 129.5 ps
CHAPTER 4
4.2 (a) −3 V, 0.6 mA; (b) +3 V, 0 mA
4.3 (a) V = 2 V, I = 2.5 mA; (b) I = 1 mA, V = 1 V
4.6 X = AB; Y = A+B; X and Y are the same for A= B; X and Y are opposite if A # B.
4.9 (a) I = 0, V = 1 V; (b) I = 0.25 mA, V = 0 V
4.11 R≥ 4.2 k�, 169.7 V
4.13 2.5 V; 1.25 V; 25 mA; 12.5 mA; 2.5 V
4.15 34 V; 8.3�; 0.6 A; 29 V; 34 V, 8�; 25%; 103 mA; 0.625 A; 29 V
4.17 At −55◦C, VT = 18.8 mV; At +55◦C, VT = 28.3 mV; VT = 25 mV at 17◦ C.
4.19 0.335 μA
4.21 (a) 6.91× 10−13 A, 0.64 V; (c) 5.11× 10−17A, 0.59 V
4.23 3.9 mA; −22 mV
4.26 A4 = 2 A3 = 4 A2 = 8 A1;1.5 mA
4.28 42 �
4.31 50◦C; 6 W; 8.33◦C/W
4.33 230 mV; independent of temperature
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Answers to Selected Problems L-5
4.35 0.6635 V, 0.3365 mA
4.37 R= 582 �
4.41 (a) −2.3 V, 0.53 mA; (b) +3 V, 0 mA
4.43 (a) I = 0, V = −1.23 V; (b) I = 0.133 mA, V = 0 V
4.45 R≥ 4.23 k�, 169.7 V; essentially the same.
4.48 0.24 mV, 2.0 mV, 9.6 mV; 25 μA
4.53 Vo/Vi = 1/(1+ jωCrd); −tan−1(ωC VT/I); 157 μA −84.3◦ to −5.71◦
4.56 R= 417�; 7.39 mA; 6.8 mV; −3.4 mV; −6.8 mV; −13.6 mV
4.59 (a) rz = 8�, 1.04 W; (b) VZ0 = 8.8 V, 188 mW
4.61 88.9 mV
4.63 167�; 7.65 V; 7.35 V; 7.78 V; 707�; 7.2 V
4.66 (a) 9.825 V; (b) 207�; (c) 33 mV/V,±1.65%; (d)−6.77 V/A,−1.35%; (e) 70.9 mA,
732 mW
4.69 0.324 V
4.71 13.44 V; 48.4%; 8.3 V; 8.3 mA
4.73 (a) 10.1:1; (b) 1.072:1
4.75 45 V
4.77 (a) 12.77 V, 13.37 V; (b) 7.1%, 2.24%; (c) 192 mA, 607 mA; (d) 371 mA; 1.2 A
4.80 (a) 9.7 V; (b) 542 μF; (c) 25.7 V, 38.5 V; (d) 739 mA; (e) 1.42 A
4.83 10.74 V; 23.5 μs; 4.913 A; 4.913 A
4.85 (a) +1 V, +2 V, +2.7 V; (b) +3 V, +6 V, +6.7 V; (c) 0 V, 0 V, 0 V, −13 V; (d) 0 V,
0 V, −13 V.
4.96 −7.07 V
CHAPTER 5
5.1 580 to 2900 μm2; 24 to 54 μm
5.4 (a) 0.5; (b) 0.5; (c) 1.0; (d) 0.5
5.7 0.35 μm
5.9 0.5 V; 0.5 mA
5.11 (a) −1.1 V; (b) −0.4 V; (c) 0.05 mA; 0.5 mA
5.13 116.3�, 116.3 mV; 50
5.17 2.8 V; 500 �, 100 �
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L-6 Appendix L Answers to Selected Problems
5.19 5 mA/V2; 0.6 V
5.21 0.5 V; 20; 145 μA; 1.5 V, 1.125 mA
5.23 2.5 k� to 125�; (a) 5 k� to 250 �; (b) 1.25 k� to 62.5�; (c) 2.5 k� to 125�.
5.29 (a) 3%; (b) 5%
5.31 200 k�, 20 k�; 5%, 5%
5.33 104 μA; 4%; double L to 3 μm
5.35 Increases by a factor of 16.
5.38 350 μA; 750 μA; 864 μA; 880 μA; 960 μA
5.41 At 3.0 V, transistor is cut off; at 2.5 V, transistor enters saturation region; at 0.5 V,
transistor enters triode region.
5.43 1 V, 0 V, 1 V, 0.25 V; 5 k�, 5 k�, 5 k�, 5 k�; 10 k�, 2 V; 10 k�, −1 V; 10 k�,
2 V; 10 k�, −0.75 V
5.45 0.08 mA; 10 k�, 5 k�; 17.5 k�
5.48 4 k�
5.50 4 μm, 11.1μm; 1.4 k�
5.52 0.45 mA, +7.3 V; quite tolerant.
5.54 44.4; 1.25 k�
5.56 −1 V, −1.43 V, −2.8 V, 1 V, 2.8 V, +1 V, 2.8 V, −1 V
5.59 I1 = 405 μA, V2 = 1.5 V; I3 = 217 μA, V4 = 1.232 V; V5 = 1.5 V, I6 = 405 μA
5.61 (a) 0.5 V, 0.5 V, −0.983 V; (b) 0.1 V, 0.9 V, −1.01 V
5.63 −1.24 V
5.65 triode, 0.59 mA; triode, 5 mA; saturation, 9 mA; saturation, 9 mA
CHAPTER 6
6.2 4.7× 10−17 A, 1.87× 10−16A; A2/A1 = 4
6.4 0.31 V
6.6 Old: 0.673 V; New: 0.846 V
6.8 80; 0.988
6.10 0.5; 0.67; 0.91; 0.95; 0.98; 0.99; 0.995; 0.998; 0.999
6.12 IC = 0.5 mA→ 3 mA; IE = 0.51 mA→ 3.01 mA; 30 mW
6.14 990 μA, 99, 0.99; 980 μA, 49, 0.98; 950 μA, 19, 0.95
6.17 −0.668 V; 1.04 V; 0.02 mA
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Answers to Selected Problems L-7
6.19 EBJ: 0.691 V; CBJ: 0.576 V; EBJ: 0.49 μA; CBJ: 48.5 μA
6.23 0.758 V; 0.815 V
6.25 238 mA; 6× 10−14 A; 87
6.28 (a) 2 mA, −0.7 V; (b) −2 V; (c) 2 V, 0.5 mA; (d) 1.6 mA, −4.5 V
6.30 8.3 k�; 20; 100; 200
6.32 RC = 4 k�; RE = 3.64 k�; RCmax = 5.86 k�
6.34 RE = 3.66 k�; RC = 5 k�
6.36 10.24 μA
6.38 0.75 V; 0.55 V
6.40 3.35 μA; 3000
6.43 125 k�; 125 V; 12.5 k�
6.45 1 mA; 10 V; 50 V; 50 k�
6.47 β = 100; βac = 80; �iC = 0.18 mA, iC = 1.18 mA
6.50 βforced = 11.2; VC = 4.8 V; RB = 45.7 k�
6.52 2.05 V, 2.38 V
6.55 R1 = 18 k�, R2 = 12 k�; 0.46 mA, 2.54 V
6.58 +0.41 V, +1.11 V, −1.15 V; +1.2 V, +1.9 V, −1.9 V; 204
6.61 (a) −0.7 V, +1.2 V; (b) +1.2 V, 0.5 mA; (c) −0.7 V, 0 V, +1.2 V; (d) +1.45 V,
−0.5 V; (e) +0.75 V, +1.45 V, −0.5 V
6.63 RE= 4 k�, RB = 50 k�, RC = 4 k�, IC = 0.85 mA to 0.98 mA, VC = −1.6 V to
−1.1 V
6.66 (a) 0 V, +0.7 V, −0.725 V, −1.425 V, +1.1 V; (b) +0.23 V +0.93 V, −1 V,
−1.7 V, +1.47 V
6.68 0 V, 0 V; +1.8 V, +1.1 V; −2.2 V, −1.5 V; −3 V, −2.3 V
CHAPTER 7
7.2 A: (0.5 V, 5 V); B: (0.72 V, 0.22 V)
7.3 20 k�; (0.72 V, 0.22 V); −40 V/V; 0.78 V; 19.5 mV
7.6 0.4 V; 8.33
7.8 (a) 0.712 V; (b) −42.7 V/V, 11.7 mV; (c) 42.88 k�; 24.9
7.10 −160 V/V; 0.7 V; 4.4 mV
7.12 1.08 V; 0.78 V; −156.7 V/V
7.15 −60 V/V
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L-8 Appendix L Answers to Selected Problems
7.18 3 mA; −120 V/V; +5 mV: exp. → −660 mV, linear → −600 mV;
−5 mV: exp. → +540 mV, linear → +600 mV.
7.25 (a) 0.1 mA, 0.8 V; (b) 1 mA/V; (c) −10 V/V; (d) 100 k�, −9.1 V/V
7.26 0.5 mA/V; 0.067 mA, 0.27 V; 9.14; 0.67 V
7.29 16 μm; 0.75 V
7.31 −18.2 V/V; 1.207 V, −23.6 V/V
7.33 (b) 2 mA/V, 200 k�; (d) 3.33 M�, 0.94 V/V, −15.38 V/V, −14.5 V/V
7.35 2.5 V; 0.611 mA, 1.95 V; 5 mV; −0.55 V; −110 V/V; −100 V/V
7.37 40 mA/V; 25�; 2.5 k�; 1 V
7.39 1.04 k� to 4.7 k�
7.42 (a) 1.000,∞, 1.00mA, 1.00mA, 0mA, 40mA/V, 25�,∞�; (c) 0.980, 50, 1.00mA,
1.02 mA, 0.02 mA, 40 mA/V, 24.5�, 1.25 k�; (e) 0.990, 100, 0.248 mA, 0.25 mA,
0.002 mA, 9.92 mA/V, 100 �, 10.1 k�
7.48 1 V; 125�; 80 V/V
7.53 Rin = 75�; vo/vsig = 39.6 V/V
7.55 −1000 V/V; −5000 V/V
7.57 8.6 k�, 7.7 k�; 77 V/V
7.59 79.4 V/V; 4762 A/A
7.64 −10 V/V
7.66 1 mA/V; 125 μA; −7.5 V/V
7.68 5 k�, 10 k�, −200 V/V; −100 V/V, −33.3 V/V; 15 mV, 0.5 V
7.70 (b) 1250 V/V
7.72 0.5 k�
7.74 30.3 k�, −40 V/V, 12 k�; −20 V/V, −15 V/V; 6.65 mV, 100 mV
7.76 80 V/V, 44.4 V/V to 109.1 V/V; Re = 275�, 25 V/V, 20 V/V to 27.3 V/V
7.78 2.5 mA/V; 0.2 V
7.80 isigRC
7.82 0.357 k�; 1.6 mA; 1.13 V
7.84 1.25 mA; 1.5 mA, 1.0 mA; 0.5 V/V; 1 V
7.86 149�, 0.87 V/V; 116� to 246�; 0.80 V/V to 0.90 V/V
7.89 −91 V/V
7.91 27.5 V/V, 41.2 V/V, 55.6 V/V, 57.1 V/V, 55.6 V/V; 0.325 mA
7.92 18M�, 22 M�, 3 k�, 3 k�; 2 V
7.94 5.07 V, 1.27 mA to 2.48 mA; 620 �; 0.91 mA to 1.5 mA
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Answers to Selected Problems L-9
7.96 2 V; 2.4 V; 1.2 mA
7.101 (a) 2.7 V, 2.2 V; (b) 3.05 V, 3.05 V
7.103 2.5 k�, 22 M�, 20 M�
7.105 (a) 230 k�; 0.5 mA to 1.5 mA; 1 V to 0 V (saturated transistor), design very intolerant
of β variation.
7.108 (a) 5.73; (b) VBB = VBE + 0.352 VCC; (c) 38.8 k�, 37.5 k�, 3.33 k�; (d) 8.1 k�;
0.475 mA to 0.509 mA with a nominal value of 0.5 mA
7.110 5.75 k�, 6.2 k�; 10.8%
7.112 (a) RC = 1.5 k�, RB = 80 k�; (b) RC = 1.5 k�, RB = 82 k�; 1.52 V, 0.98 mA;
(c) 0.7 V, 1.53 mA; (d) RB1 = 40 k�, RB2 = 70 k�, RC = 1.47 k�, 1.1 V, 1.28 mA
7.116 8.6 k�, +0.4 V
7.118 (a) VD = 2.5 V, kn = 11.1 mA/V2; (b) 120 k�, −4.1 V/V; (c) 0.264 V, 1.08 V;
(d) 300 �, 1.08 V
7.120 20 mA/V; 0.1 mA; 5 mV; 10 k�
7.122 (a) 0.99 V/V, 99�; (b) 99�, 14.3 V/V; (c) 7.15 V/V
7.124 (a) 1.6 V, 0.1 mA, 82.4 k�; (b) 1 mA/V; (d) 1.95 V/V, 39.1 k�
7.126 R1 = 47 k�, R2 = 24 k�, RE = 2.2 k�, RC either 4.7 k� or 5.1 k�
7.128 RB = 91 k�, RC = 22 k�, I = 0.2 mA; −176 V/V; −29.7 V/V
7.130 (a) 1 mA, 8.2 V; (c) 2.32 k�, 0.32 V/V; (d) 2.32 k�, −69.2 V/V; (e) −61.8 V/V;
(f) 1368.5 V/V
7.132 (a) 0.495 mA, 1.18 V; −71.9 V/V
7.134 β = 50: (a) 0.78mA, 0.78V, 1.48 V; (b) 21.3 k�; (c) 0.64 V/V; β = 200: (a) 1.54mA,
1.54 V, 2.24 V; (b) 50.9 k�; (c) 0.81 V/V
7.136 (a) 1.73 mA, 68.4 mA/V, 14.5 �, 1.4645 k�; (b) 148.3 k�, 0.93 V/V; (c) 18.21 k�,
0.64 V/V
7.138 75�; 25 Hz; 25 V/V
CHAPTER 8
8.1 12 k�; 0.2 V; 25 k�; 20 μA
8.3 50; 8.75 k�
8.6 5 μm, 25 μm, 10 μm, 2.5 μm, 5 μm; 15 k�; 25 k�, 31.25 k�
8.8 (a) 0.691 V to 0.863 V, 10μA to 10 mA; (b) 9.62μA, 0.098 mA, 0.98 mA, 9.62 mA
8.11 0.1 mA, 10%
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