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Chapter 7 Pulse Circuits and Waveform Generatorsand from (7.8)R B = 14.43 – 8.66 = 5.77 KΩR A = 8.66 – 5.77 = 2.89 KΩ(7.9)Figure 7.11 shows an alternate form of an astable multivibrator using the 555 Timer.V CCR Av CCR BRR2 ⁄ 3 V CCComparator 1+R1 ⁄ 3 V CCS+QQT 1 T 2OutputComparator 2RFigure 7.11. Alternate form of an astable multivibrator with a 555 TimerWith the circuit of Figure 7.11 we can obtain any desired value for the duty cycle as we will seefrom the relations below.For the charging interval the circuit is as shown in figure 7.12.T 1V CCR ACv C () tFigure 7.12. Circuit for the charging interval7−8Electronic Devices and Amplifier Circuits with MATLAB Computing, Second EditionCopyright © Orchard Publications
Astable Multivibrator with the 555 TimerFor this interval, = V CC , V in = 1 ⁄ 3 V CC , and R eq = R A . Then, relation (7.1) becomesV ∞v C () t V CC ( V CC – 1⁄ 3 V CC )e t R A– – ⁄ CV CC ( 2 ⁄ 3 V CC )e t R A= = –– ⁄ C(7.10)At t = T 1 , v C () t = 2⁄ 3 V CC and relation (7.10) becomesT 12⁄ 3 V CC V CC ( 2⁄ 3 V CC )e t R A= –– ⁄ C( 2 ⁄ 3 )e – t⁄R A C= 1 ⁄ 3e t⁄R A C– = 1 ⁄ 2– ⁄ R A C = ln( 1⁄2)= ln1 – ln2= 0 – ln2T 1 = ln2⋅ R A C =0.69R A C(7.11)For the discharging interval the circuit is as shown in figure 7.13.T 2V CCR ACv C () tR BFigure 7.13. Circuit for the discharging intervalFor this interval, V ∞ = ( R B ⁄ ( R A + R B ) )V CC , V in = 2⁄ 3 V CC , and R eq = R A|| R B . Then, relation(7.1) becomesv C () t=R------------------- BR A + R B⎛ ⎞ VCC⎛ R------------------- B ⎞–VCC – 2⁄ 3 V⎝ ⎠ ⎝ + ⎠CC e t ⁄ R || A R B–R AR B( )C(7.12)At t = T 2 , v C () t = 1⁄ 3 V CC and relation (7.12)becomes1⁄ 3 V ⎛ R BCC------------------- ⎞ VCC⎛ R------------------- B ⎞–VCC – 2⁄ 3 V⎝ + ⎠ ⎝ + ⎠CC e T 2 ⁄ R A || R=–BR AR BR AR B( )C– [ 1⁄ 3 – R B ⁄ ( R A + R B ) ]V= --------------------------------------------------------------------- CC=[ 2⁄ 3 – R B ⁄ ( R A + R B ) ]V CCe T 2 ⁄ ( R A || R B )C⎛⎝R A – 2R---------------------- B ⎞2R A – R B⎠(7.13)e T 2 ⁄ R B C– = 1 ⁄ 2Electronic Devices and Amplifier Circuits with MATLAB Computing, Second EditionCopyright © Orchard Publications7−9
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Electronic Devicesand Amplifier Cir
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Table of Contents1 Basic Electronic
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3.16 Transistor Cutoff and Saturati
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10.10 Summary .....................
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Chapter 1Basic Electronic Concepts
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Chapter 1 Basic Electronic Concepts
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Exercises5. The circuit model shown
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Solutions to End−of−Chapter Exe
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Chapter 2Introduction to Semiconduc
Page 21 and 22:
The Junction Diodek = 1.38 × 10 -
Page 23 and 24:
Piecewise Linear ApproximationsI---
Page 25 and 26:
Exercises+v in () t−R++v out () t
Page 27 and 28:
The Bipolar Junction Transistor as
Page 29 and 30: 4.65 - V B = 0.1V B + 0.2V B + 2.1S
Page 31 and 32: Chapter 4Field Effect Transistors a
Page 33 and 34: The Silicon Controlled Rectifier (S
Page 35 and 36: The Silicon Controlled Rectifier (S
Page 37 and 38: Analysis of Op Amp Circuitsv inC 1R
Page 39 and 40: Analysis of Op Amp Circuits+v in−
Page 41 and 42: Analysis of Op Amp CircuitsExample
Page 43 and 44: The Op Amp IntegratorSolution:From
Page 45 and 46: The Op Amp DifferentiatorAt t=10 s-
Page 47 and 48: and since v C ( 0 − ) = 0 , from
Page 49 and 50: Differential Input Op Amp+v in1−R
Page 51 and 52: Differential Input Op AmpThen, from
Page 53 and 54: Instrumentation Amplifiers+v o1 R R
Page 55 and 56: Chapter 5 Operational AmplifiersSle
Page 57 and 58: Chapter 5 Operational Amplifiersa.
Page 59 and 60: Chapter 5 Operational AmplifiersThe
Page 61 and 62: Chapter 5 Operational AmplifiersAls
Page 63 and 64: Chapter 5 Operational Amplifiersreq
Page 65 and 66: Chapter 5 Operational Amplifierswe
Page 67 and 68: Analog−to−Digital Convertersato
Page 69 and 70: Quantization, Quantization Error, A
Page 71 and 72: Chapter 6 Integrated CircuitsWith r
Page 73 and 74: Chapter 7Pulse Circuits and Wavefor
Page 75 and 76: Astable Multivibrator with the 555
Page 79: Astable Multivibrator with the 555
Page 87 and 88: Appendix CProportional−Integral
Page 89 and 90: electromagnetic interference 4-26 G
Page 91: string in MATLAB A-17Vsubplot(m,n,p
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