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
    1
    0
    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
    2
    1
    Read this article about FM transmitter...it may help you... FM transmitter
     
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