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Avalanche photodiode spice model

Discussion in 'Electronic Design' started by Yannick, May 22, 2006.

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  1. Yannick

    Yannick Guest


    I am looking for a spice model for an avalanche photodiode , if
    possible the C39021E. its for simulating optoelectronic mixing.

    thanks for any info

  2. yinbing-zhou

    yinbing-zhou Guest

    This paper has proposed a theoretical idea to construct particles by
    using electron, positron, neutrino and anti-neutrino as well as the
    weak force interaction among them; it has theoretically estimated the
    radii of neutron and proton as well as the range and strength of
    so-called nuclear force, also has explained the reason for the feature
    of saturation and short-range of nuclear force and various nuclear
  3. engineer

    engineer Guest

    all very interesting, but a wrong response in also the wrong forum.. is
    a mistake

    also, in trying to sound smart, you refrained from saying anything
  4. engineer

    engineer Guest

    Since when do spice programs allow optical signals other than internal
    to the device?
  5. engineer

    engineer Guest

    Since when do spice programs allow optical signals other than internal
    to the device?
  6. Jim Thompson

    Jim Thompson Guest


    ...Jim Thompson
  7. Marc Popek

    Marc Popek Guest


    If you want to take red light and say red light shfited by 420Mc and then
    have both light sources fall onto an APD and then you like to see how much
    430 MC you can extract for varying:

    light levels (re and red shifted by 420mc) and the bias and the apd devcie..
    no can do in spice....
    Your best bet for an answer is to use a pencil and paper and come close to
    the answer, assume an exponential transfer function and exime the mixing
    prodcut's ampltiudes.....

  8. colin

    colin Guest

    I think hes using the technique I sugested for hetrodyne LIDAR some time
    The light is modulated with one frequency and the bias to the APD is
    modulated with another frequency,
    the resulting electrical output of the APD is the product of the two
    the mixing being done at the opto-electronic level not the optical or
    electronic level,
    the advantage is that the high frequency light modulation frequency is not
    converted directly to an electronic signal therefore the APD capacitance
    does not have any effect on this wich would severly limit the acheivable SNR
    for low light, only on the beat frequency wich as it is much lower frquency
    is much less affected by it.

    It relies on the multiplication effect of the bias voltage, the gain of the
    device rises with voltage very sharply at voltages just below vbr.

    In a simple demonstration of this I used gain=1+(v/250)^k with k 20~200 wich
    gives an arbitraraly sharp curve just over 250v.
    I dont know how steep the curve is as it isnt ploted on the data sheet very
    far but at some point just above vbr it tends to infinity as it latches on.

    There seems to be no information on the frequency response of the gain to
    the bias voltage, although the gain bandwidth product is given but this is
    the response to the light signal, but my gues they are closely related, but
    I had it working some time ago at 10mhz and just recently at 100mhz, im
    looking to get try it up to 2ghz.

    Colin =^.^=
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