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

    100W Guitar Amplifier
    Simple CB receiver with SO42P
    Mini Headphone Amplifier
    Light-Wave Voice-Communication Transmitter Circuit
    Solar Cell Voltage Regulator
    audio Smallest circuit to make a sound
    low cost audio headphone amplifier
    16 led46 led circuit combination
    ham radio circuit audio filter
    FM Wireless Microphone Transmitter with High Power
    Phase Locked Loop (PLL) Oscillator Circuit 860 MHz
    Aristo Streamliner Tips
    PF Test Equipment
    PIC-based applications from Westford MicroSystems descriptions C source code and schematics



    Top