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square to sine converter

Discussion in 'Electronic Design' started by Kubicki, Sep 8, 2003.

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  1. Kubicki

    Kubicki Guest

    Hi all
    I'm looking for a circuit that accepts a squarewave input of, say, 1 to 15
    Mhz and outputs a sine wave of the same frequency as precise as possible.

    Thanks to all.
  2. Make a sine wave VCO, the output of your VCO is the output of your circuit.

    Take the sine to a schmitt-trigger and XOR this with the input signal, low-
    filter the XOR output to control the VCO.

    Just a PLL with some extra's.

    Do a lot of calculations before you start, might be a bit hard to get the
    PLL stable over the complete range from 1..15 MHz.

    Good luck.
  3. D. Ford

    D. Ford Guest

    Would be much easier with a triangle wave driving a pair of reversed diodes
    in parallel and a limiting resistor. This would give a sine approximation
    with few percents of harmonic distorsion.

    What is your source?

  4. Kubicki

    Kubicki Guest

    Thanks a lot Jeroen!

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