Code No: 23061
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Set No - 1
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II B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 PULSE AND DIGITAL CIRCUITS Common to Electronics And Computer Engineering, Electronics And Telematics, Electronics And Communication Engineering, Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
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1. (a) Explain the method of obtaining balanced conditions in a bidirectional diode gate. [8] (b) Illustrate and explain the effect of capacitances in a bidirectional diode gate. [8]
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2. (a) A pulse is applied to a low-pass RC circuit. Prove by direct integration that the area under the pulse is same as the area under the output waveform across the capacitor. Explain the result. [10] (b) Write a short notes on Highpass RC circuit as a differentiator.
[6]
3. (a) Explain the behavior of a BJT as a switch. Give Applications.
[8] [8]
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(b) Write a short note on switching times of a transistor.
4. (a) Explain the principle of “synchronization” and ‘synchronization with frequency division’. [8] (b) Explain the method of pulse synchronization of relaxation devices, with examples. [8] 5. A collector-coupled monostable multi using silicon n-p-n transistors has the Following parameters:
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Vcc =12v,VBB =3v, Rc1 =Rc2 =1.8kΩ,R1 =R2 =18KΩ,hf e =25,rbb’=400 and C=1200pf. Neglect ICBO .Use VCE (sat)=0.2V, VBE (sat)=0.7V and Vr=0.6V. (a) Calculate and plot the waveforms at each base and collector.
[12] [2]
(c) Find the output pulse width.
[2]
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(b) Find the overshoot.
6. (a) Draw a typical circuit for clipping at two independent levels. Explain in detail the circuit and sketch it’s characteristics. [8] (b) Derive the steady state response of a clamping circuit for a square wave input in which the resistance Rs of the signal source is taken into account. [8]
7. In a base timed triggered transistor blocking oscillator, RL is connected from the collector to ground. Assuming that VBB = 0, but neglecting saturation junction voltages, derive the expression for pulse amplitude and width in terms of circuit parameters. [16] 1
Code No: 23061
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Set No - 1
8. (a) Explain the principle of working of Miller sweep circuit. Derive the expression for sweep speed by taking Miller integrator circuit. [8] (b) Draw a simple single stage transistor Miller integration circuit and explain how it behaves as a time-base circuit. [8]
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2
Code No: 23061
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Set No - 2
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II B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 PULSE AND DIGITAL CIRCUITS Common to Electronics And Computer Engineering, Electronics And Telematics, Electronics And Communication Engineering, Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. (a) Explain the principle of “synchronization” and ‘synchronization with frequency division’. [8] (b) Explain the method of pulse synchronization of relaxation devices, with examples. [8] 2. (a) Explain the behavior of a BJT as a switch. Give Applications.
or
(b) Write a short note on switching times of a transistor.
[8]
[8]
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3. In a base timed triggered transistor blocking oscillator, RL is connected from the collector to ground. Assuming that VBB = 0, but neglecting saturation junction voltages, derive the expression for pulse amplitude and width in terms of circuit parameters. [16] 4. (a) A pulse is applied to a low-pass RC circuit. Prove by direct integration that the area under the pulse is same as the area under the output waveform across the capacitor. Explain the result. [10] (b) Write a short notes on Highpass RC circuit as a differentiator.
[6]
5. A collector-coupled monostable multi using silicon n-p-n transistors has the Following parameters:
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Vcc =12v,VBB =3v, Rc1 =Rc2 =1.8kΩ,R1 =R2 =18KΩ,hf e =25,rbb’=400 and C=1200pf. Neglect ICBO .Use VCE (sat)=0.2V, VBE (sat)=0.7V and Vr=0.6V. (a) Calculate and plot the waveforms at each base and collector.
[12] [2]
(c) Find the output pulse width.
[2]
Aj
(b) Find the overshoot.
6. (a) Explain the principle of working of Miller sweep circuit. Derive the expression for sweep speed by taking Miller integrator circuit. [8] (b) Draw a simple single stage transistor Miller integration circuit and explain how it behaves as a time-base circuit. [8]
7. (a) Draw a typical circuit for clipping at two independent levels. Explain in detail the circuit and sketch it’s characteristics. [8] 3
Code No: 23061
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Set No - 2
(b) Derive the steady state response of a clamping circuit for a square wave input in which the resistance Rs of the signal source is taken into account. [8] 8. (a) Explain the method of obtaining balanced conditions in a bidirectional diode gate. [8]
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(b) Illustrate and explain the effect of capacitances in a bidirectional diode gate. [8]
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4
Code No: 23061
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Set No - 3
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II B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 PULSE AND DIGITAL CIRCUITS Common to Electronics And Computer Engineering, Electronics And Telematics, Electronics And Communication Engineering, Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. In a base timed triggered transistor blocking oscillator, RL is connected from the collector to ground. Assuming that VBB = 0, but neglecting saturation junction voltages, derive the expression for pulse amplitude and width in terms of circuit parameters. [16]
or
2. (a) Draw a typical circuit for clipping at two independent levels. Explain in detail the circuit and sketch it’s characteristics. [8] (b) Derive the steady state response of a clamping circuit for a square wave input in which the resistance Rs of the signal source is taken into account. [8]
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3. (a) A pulse is applied to a low-pass RC circuit. Prove by direct integration that the area under the pulse is same as the area under the output waveform across the capacitor. Explain the result. [10] (b) Write a short notes on Highpass RC circuit as a differentiator.
[6]
4. (a) Explain the method of obtaining balanced conditions in a bidirectional diode gate. [8] (b) Illustrate and explain the effect of capacitances in a bidirectional diode gate. [8]
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5. (a) Explain the principle of working of Miller sweep circuit. Derive the expression for sweep speed by taking Miller integrator circuit. [8] (b) Draw a simple single stage transistor Miller integration circuit and explain how it behaves as a time-base circuit. [8]
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6. (a) Explain the principle of “synchronization” and ‘synchronization with frequency division’. [8] (b) Explain the method of pulse synchronization of relaxation devices, with examples. [8]
7. A collector-coupled monostable multi using silicon n-p-n transistors has the Following parameters: Vcc =12v,VBB =3v, Rc1 =Rc2 =1.8kΩ,R1 =R2 =18KΩ,hf e =25,rbb’=400 and C=1200pf. Neglect ICBO .Use VCE (sat)=0.2V, VBE (sat)=0.7V and Vr=0.6V.
5
Code No: 23061
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Set No - 3
(a) Calculate and plot the waveforms at each base and collector.
[12]
(b) Find the overshoot.
[2]
(c) Find the output pulse width.
[2]
8. (a) Explain the behavior of a BJT as a switch. Give Applications.
[8]
in
(b) Write a short note on switching times of a transistor.
[8]
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nt
uW
or
ld .
?????
6
Code No: 23061
RR
Set No - 4
in
II B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 PULSE AND DIGITAL CIRCUITS Common to Electronics And Computer Engineering, Electronics And Telematics, Electronics And Communication Engineering, Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. (a) A pulse is applied to a low-pass RC circuit. Prove by direct integration that the area under the pulse is same as the area under the output waveform across the capacitor. Explain the result. [10] (b) Write a short notes on Highpass RC circuit as a differentiator.
[6]
or
2. (a) Explain the method of obtaining balanced conditions in a bidirectional diode gate. [8] (b) Illustrate and explain the effect of capacitances in a bidirectional diode gate. [8] 3. A collector-coupled monostable multi using silicon n-p-n transistors has the
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Following parameters:
Vcc =12v,VBB =3v, Rc1 =Rc2 =1.8kΩ,R1 =R2 =18KΩ,hf e =25,rbb’=400 and C=1200pf. Neglect ICBO .Use VCE (sat)=0.2V, VBE (sat)=0.7V and Vr=0.6V. (a) Calculate and plot the waveforms at each base and collector.
[12]
(b) Find the overshoot.
[2]
(c) Find the output pulse width.
[2]
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4. In a base timed triggered transistor blocking oscillator, RL is connected from the collector to ground. Assuming that VBB = 0, but neglecting saturation junction voltages, derive the expression for pulse amplitude and width in terms of circuit parameters. [16]
Aj
5. (a) Draw a typical circuit for clipping at two independent levels. Explain in detail the circuit and sketch it’s characteristics. [8] (b) Derive the steady state response of a clamping circuit for a square wave input in which the resistance Rs of the signal source is taken into account. [8]
6. (a) Explain the behavior of a BJT as a switch. Give Applications. (b) Write a short note on switching times of a transistor.
[8] [8]
7. (a) Explain the principle of “synchronization” and ‘synchronization with frequency division’. [8] 7
Code No: 23061
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Set No - 4
(b) Explain the method of pulse synchronization of relaxation devices, with examples. [8] 8. (a) Explain the principle of working of Miller sweep circuit. Derive the expression for sweep speed by taking Miller integrator circuit. [8]
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(b) Draw a simple single stage transistor Miller integration circuit and explain how it behaves as a time-base circuit. [8]
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8
