PSpice simulations: ASK and 2PSK modulation by the balanced modulator - 4PSK type B block diagram

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ASK and 2PSK modulator

ASK and 2PSK modulation by the balanced modulator

The ASK modulation coincides with the 2PSK modulation. The circuit uses a balanced modulator and the modulating wave is a square wave. At each inversion of the modulating wave, in output, there is an inversion of the carrier wave (see 2° plot).

4PSK modulator

4PSK type B block diagram

The 0 bit is rappresented by a 5V voltage. The 1 bit is rappresented by a -5V voltage. The differenziator causes 90° rotation

PWM

Pulse Width Modulation by NE555

The width of the pulses is relatet to the amplitude of the control input signal.

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