Pulse Amplitude Modulation

Spectrum Trace

Modulating Sine signal
Spectrum Trace

40khz Square Wave
Spectrum Trace

40khz Square wave modulated by Sine waveclearly shows Squarwave harmonics
The second peek at each harmonic is the Modulation by Sine wave
Ocillosope Trace

Gate Pulse set equal to modulated pulse width
Ocilloscope Trace

Output signal With this pulse width
Ocillosope Trace

Gate Pulse set to shortest
Ocilloscope Trace

Output signal With narrowest gate pulse
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