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Unstable Demodulated PWM output

Discussion in 'General Electronics Discussion' started by engg, Dec 22, 2011.

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  1. engg

    engg

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    Dec 18, 2011
    Hello everyone,
    I was doing a small project showing its modulated and demodulated output. I am getting accurate PWM output but the demodulated sinewave is unstable.I have used second order low pass filter. I am stuck up and not getting any solution.

    Please help!
    Thanking you in advance.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Please describe "unstable"
     
  3. engg

    engg

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    Dec 18, 2011
    I mean that the peaks of the sinewave increases and decreases constantly......
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,412
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    Jan 21, 2010
    What is your carrier frequency and what is the frequency of your modulating signal?

    Does the demodulated signal appear to itself be (a) amplitude modulated (or (b) are the variations apparantly random?

    If A, can you estimate the frequency?

    Even better, can you post images of the signals and your curcuit.
     
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