Phase demodulation

Posted on Feb 4, 2014

The quadrature-grid signal is excited by a reference from the transmitter. This may be a sample of the unmodulated master oscillator providing a phase reference for the detector.

Phase demodulation
Click here to download the full size of the above Circuit.

The modulated waveform is applied to the limiter grid. Gating action in the tube will occur as the phase shifts between the input waveform and the reference. The combined output current from the gated-beam tube will be a series of current pulses. These pulses will vary in width as shown in figure 3-20. The width of these pulses will vary in accordance with the phase difference between the carrier and the modulated wave.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Photodiode signal conditioner
    Ultrasonic Mosquito Repeller Circuit Using CMOS IC
    infrared transmitters using lm3909
    12 volt car battery monitor
    DIY ECG Machine On The Cheap
    Host computer automatic temperature control circuit
    Anti-saturation function delete circuit schematics