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The output of the comparator is fed to a monostable multivibrator. Here, we have made a detailed block diagram where first, a PAM signal is produced with is further processed at the comparator in order to generate a PWM signal. The figure below shows the block diagram for generating a PPM signal: Thus, here we have assumed that a PWM signal is already generated at the output of the comparator and now we have to generate a PPM signal. Block diagram for generation of PPM signalĪs we have already discussed that a PPM signal can be easily generated by making use of a PWM signal. Thus, the trailing edge of the PWM signal acts as the beginning point of the pulses of PPM signal. Now, the question arises how the position of the pulses show variation?Īs we have already discussed that a PPM signal is generated in reference to a PWM signal. Thus, transmission power does not show variation. However, this is not the case with PPM as here the width of the pulses remains constant and only their position varies. The basic idea about the generation of a PPM waveform is that here, as the amplitude of the message signal increases, the pulse shifts according to the reference.Īs we have already discussed in PWM that due to the variable width of the pulses, the transmission power also varies accordingly. The information is transmitted with the varying position of the pulses in pulse position modulation. PWM is the first type of PTM and is discussed in the previous content. Furthermore, for any help on Electronic projects or doubts regarding this article, you can contact us by commenting in the comment section given below.To understand the generation of the PPM signal, it is necessary to understand Pulse Width Modulation (PWM or PDM). This article is all about the difference between PAM, PWM, and PPM techniques. The complexity of generation and detection Instantaneous transmitter power remains constant with the width of the pulses Instantaneous transmitter power varies with the amplitude and width of the pulses

Instantaneous transmitter power varies with the amplitude of the pulses Variable Characteristic of the Pulsed Carrierīandwidth depends on the width of the pulseīandwidth depends on the rise time of the pulse The below table gives a detailed difference between PWM, PAM, and PPM. In all the above cases, we detect the message of the pulse modulated signal and reconstruct the original analog signal. But the main disadvantage of the PPM modulation technique is, The synchronization between transmitter and receiver must be needed. Hence, the position of these pulses is proportional to the width of the PWM pulses.