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PPM

PPM. Professor: Dr. Miguel Alonso Jr. Outline. PPM Delta Modulation. PPM. Pulse Position Modulation Very Similar to PWM PPM can be generated from PWM. PPM. The inverter first inverts the signal Differentiator causes positive and negative spikes to be generated

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PPM

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  1. PPM Professor: Dr. Miguel Alonso Jr.

  2. Outline • PPM • Delta Modulation

  3. PPM • Pulse Position Modulation • Very Similar to PWM • PPM can be generated from PWM

  4. PPM • The inverter first inverts the signal • Differentiator causes positive and negative spikes to be generated • Applying them to a Schmidt trigger sensitive to only positive levels, a constant amplitude constant pulse width is formed • Position of these pulses is proportional to the original modulating signal

  5. PPM Demodulation • At the receiver, the PPM is typically converted into PWM and then low-pass filtered • PWM is recovered from the PPM by using the PPM signal and a synchronization pulse at the original sampling rate • The sync pulse can be used to set an SR flip flop and the PPM pulse can be used to reset it, thus generating a PWM signal.

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