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PIN mdulator for MHz

Discussion in 'Electronic Design' started by Ludwig Kerr, May 19, 2007.

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  1. Ludwig Kerr

    Ludwig Kerr Guest

    I recently discovered a device called a "PIN modulator". Here is some
    more info on the various apps, for anyone who may be interested.

    It is a prepackage circuit (box) with three connectors, most commonly
    used to modulate GHz signals with much lower ones, down to the audio
    range. However, my needs are slightly different.

    Is anyone aware of a ready-made device of this type that will modulate
    frequencies in the 1-30MHz range? The lowest I have seen is 500MHz.

    Thank you,

    Ludwig Kerr
  2. Joerg

    Joerg Guest

    HP published the most excellent app notes for PIN diodes. Then it went
    to Agilent, then Avago. So it'll be a bit of detective's work to find
    them but it's well worth it.

    Usually the upper limit when using a PIN diode (or pair) as a modulator
    is given by the carrier lifetime. You can't easily swing them a whole
    lot faster than that. I mostly designed around HSMP3810 and similar
    devices and those are all in the usec range, meaning you can't use them
    for modulation signals in the MHz range. But of course you can get
    versions under 100nsec. Very important is that the spectra of the
    to-be-modulated RF and the highest expected modulation frequencies are
    far apart.
  3. Jasen

    Jasen Guest

    use ordinary diodes instead ?

  4. vasile

    vasile Guest

    Microwave PIN diodes works in the microwave range.
    See a very old application on my site:
    In the 30MHz range will be much easy to use any integrated IC
    or a transistor based schematic.

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