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circuit for DSSC amplitude modulated wave.

Discussion in 'Electronic Design' started by abhilsah j, May 7, 2004.

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  1. abhilsah j

    abhilsah j Guest

    i have been trying to get a circuit for DSSC de-modulator. would u
    please sent one to me. also would anyone of u please sent me a circuit
    for a single side band suppressed carrier modulator that uses crystal
    filter to cutoff one of its side bands. i am actually experimenting
    with my simulator but i dont have the required circuit. Thank you.

    from abhilash J
  2. A double-sideband suppressed carrier demodulator is usually
    implemented by multiplying the signal by itself, followed by a
    low-pass filter. You will need to determine if you need certain types
    of carrier re-insertion depending upon the application.

    For the modulator, you will need to be more specific: Baseband signal
    bandwidth and group delay, carrier frequency, etc ....
    May I borrow this line? I could have used it in a few tight spots ;-)

    Frank Raffaeli
  3. Jim Thompson

    Jim Thompson Guest

    A DSSC signal is what you get from a Gilbert cell multiplier
    (inserting carrier to the upper rank of transistors, the modulation to
    the lower rank). Takes no filtering.

    Now if you want SSSC, you need I and Q versions of both carrier AND
    modulation (the tricky part), two Gilbert cells, and sum (or
    difference) the result.

    ...Jim Thompson
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