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Sec. 3–11 Pulse Time Modulation: Pulse Width Modulation and PPM 223<br />

V c<br />

Reset &<br />

Start<br />

(pulse)<br />

Integrator<br />

Stop<br />

(pulse)<br />

Truncated<br />

ramp<br />

Sample & hold<br />

clock<br />

PAM<br />

Low-pass<br />

filter<br />

Analog<br />

output<br />

A<br />

B<br />

PWM input<br />

Differentiator<br />

Inverter<br />

To A<br />

To B<br />

PPM input<br />

From clock<br />

sync circuit<br />

Clocking signal<br />

To A<br />

To B<br />

PWM<br />

input<br />

PPM<br />

input<br />

t<br />

V 1<br />

V 1<br />

V 2 V3<br />

V 2<br />

V 3<br />

V 4<br />

V 4<br />

Integrator<br />

output<br />

(truncated ramp)<br />

PAM<br />

waveform<br />

Figure 3–46<br />

Detection of PWM and PPM signals.

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