Discussion
What does a monostable contribute to a pulse position modulator?
Answer: D
The monostable turns a moving edge into a short pulse of standard width, which is exactly what position modulation needs - all the information in the timing, none in the shape. The ramp belongs to the width modulator ahead of it, the slot clock comes from the multiplexer, and the holding capacitor belongs to a sample-and-hold. A stage that standardises everything except the one parameter carrying the message is what gives a scheme its noise immunity.
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