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Pulse Position Modulation PPM, Lecture notes of Digital & Analog Electronics

Jaypee University of Engineering & TechnologyDigital & Analog Electronics

Pulse Position Modulation introduction and detail

Typology: Lecture notes

2013/2014

Uploaded on 03/05/2014

kshitij.gaur.11
kshitij.gaur.11 ๐Ÿ‡ฎ๐Ÿ‡ณ

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Page๎˜ƒ1๎˜ƒof๎˜ƒ4๎˜ƒ
http://mhakhan.tripod.com/lab.html
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Experiment๎˜ƒ#๎˜ƒ09๎˜ƒ
PULSE๎˜ƒPOSITION๎˜ƒMODULATION๎˜ƒ(PPM)๎˜ƒ
1. OBJECT:๎˜ƒ๎˜ƒ
Study๎˜ƒthe๎˜ƒPulse๎˜ƒPosition๎˜ƒModulation๎˜ƒand๎˜ƒDemodulation๎˜ƒschemes๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ
using๎˜ƒScientech๎˜ƒkit๎˜ƒmodel๎˜ƒSTโ€2110.๎˜ƒ
2. APPARATUS:๎˜ƒ
1)๎˜ƒScientech๎˜ƒPPM๎˜ƒkit๎˜ƒmodel๎˜ƒSTโ€2110.๎˜ƒ
๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ2)๎˜ƒ20๎˜ƒMHz๎˜ƒdual๎˜ƒtrace๎˜ƒCRO.๎˜ƒ
๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ3)๎˜ƒSine๎˜ƒwave๎˜ƒoscillator.๎˜ƒ
3. Brief๎˜ƒTheory๎˜ƒ:๎˜ƒ
๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒIn๎˜ƒPulseโ€Position๎˜ƒmodulation๎˜ƒ(PPM),๎˜ƒthe๎˜ƒposition๎˜ƒof๎˜ƒa๎˜ƒpulse๎˜ƒrelative๎˜ƒto๎˜ƒ
its๎˜ƒunmodulated๎˜ƒtime๎˜ƒof๎˜ƒoccurrence๎˜ƒis๎˜ƒvaried๎˜ƒin๎˜ƒaccordance๎˜ƒwith๎˜ƒthe๎˜ƒmessage๎˜ƒ
signal.๎˜ƒ
Amplitude๎˜ƒand๎˜ƒwidth๎˜ƒof๎˜ƒthe๎˜ƒpulses๎˜ƒis๎˜ƒkept๎˜ƒconstant๎˜ƒin๎˜ƒthis๎˜ƒsystem,๎˜ƒwhile๎˜ƒ
the๎˜ƒposition๎˜ƒof๎˜ƒeach๎˜ƒpulses,๎˜ƒin๎˜ƒrelation๎˜ƒto๎˜ƒthe๎˜ƒposition๎˜ƒof๎˜ƒa๎˜ƒrecurrent๎˜ƒreference๎˜ƒ
pulse๎˜ƒis๎˜ƒvaried๎˜ƒby๎˜ƒeach๎˜ƒinstantaneous๎˜ƒsampled๎˜ƒvalue๎˜ƒof๎˜ƒthe๎˜ƒmodulating๎˜ƒwave.๎˜ƒ
Pulseโ€Position๎˜ƒModulation๎˜ƒhas๎˜ƒthe๎˜ƒadvantage๎˜ƒof๎˜ƒrequiring๎˜ƒconstant๎˜ƒ
transmitter๎˜ƒpower๎˜ƒoutput,๎˜ƒbut๎˜ƒthe๎˜ƒdisadvantages๎˜ƒof๎˜ƒdepending๎˜ƒon๎˜ƒtransmitter๎˜ƒ
receiver๎˜ƒis๎˜ƒsynchronization.๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ
๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ๎˜ƒ
๎˜ƒ
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Download Pulse Position Modulation PPM and more Lecture notes Digital & Analog Electronics in PDF only on Docsity!

Experiment # 09

PULSE POSITION MODULATION (PPM)

1. OBJECT :

Study the Pulse Position Modulation and Demodulation schemes using Scientech kit model STโ€2110.

  1. APPARATUS:
    1. Scientech PPM kit model STโ€2110.
      1. 20 MHz dual trace CRO.
      2. Sine wave oscillator. 3. Brief Theory : In Pulseโ€Position modulation (PPM), the position of a pulse relative to its unmodulated time of occurrence is varied in accordance with the message signal. Amplitude and width of the pulses is kept constant in this system, while the position of each pulses, in relation to the position of a recurrent^ reference pulse is varied by each instantaneous sampled value of the modulating wave. Pulseโ€Position Modulation has the advantage of requiring constant transmitter power output, but the disadvantages of depending on transmitter receiver is synchronization.

4.Experiment Setup: Where m(t) is a message signal (2KHz/1v (^) pโ€p )โ€ฆโ€ฆ

5. OBSERVATIONS: a) FOR PULSE POSITION MODULATION : A train of pulses p(t), used as carrier, is internally connected to the modulator and can be viewed on CRO at the PPM output socket (t (^) pโ€ 7 ), keeping message input socket (t (^) pโ€ 6 ) not connected with any signal. 1. Amplitude of the carrier p(t) = โ€ฆโ€ฆโ€ฆโ€ฆโ€ฆ Volts (^) pโ€p 2. Time period of the carrier p(t) T= โ€ฆโ€ฆโ€ฆ.. ms, PRR = โ€โ€โ€โ€โ€โ€โ€โ€ KHz

3. Width ฯ„ =โ€ฆโ€ฆ.

4. Duty cycle D= T/ ฯ„ = โ€ฆโ€ฆโ€ฆ %

The position of the carrier pulses p(t) can be modulated by connecting a sinusoidal signal of variable amplitude & variable frequency to the message input socket (t (^) pโ€ 6 ) of the modulator.