Need help in FM modulator and PLL-based FM demodulator

Discussion in 'The Projects Forum' started by bradiboy, Sep 25, 2011.

  1. bradiboy

    Thread Starter New Member

    Sep 24, 2011
    Hi guys! This is my first time posting in this forum.

    For my project, i am making a simple FM modulator and a PLL-based FM demodulator. I have read many articles and sources in the net but i cant seem to find the right answers to my questions. I hope you guys can help me.

    For FM modulator:

    I have seen FM modulator circuit using varactor diode and IC. But, in my project, a carrier frequency is already given by a function generator. I was wondering where can i input the carrier frequency generated. My problem the design of the circuit. Also, I cant seem to find out the calculations for the value of capacitors and resistors and inductors.

    For PLL demodulator:
    I would like to discuss this after i finished the FM modulator. I think i need to have a good understanding of the circuit of the FM modulator first before proceeding to this. :))

    I hope you can help me guys.
  2. blackmask

    New Member

    Apr 15, 2011
    Read this article about FM may help you... FM transmitter