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A very basic photodiode (relevant for diodes too!) question

Discussion in 'Electronic Design' started by usefulfacts, May 10, 2007.

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  1. usefulfacts

    usefulfacts Guest

    If I have 3 photodiodes, PD1, PD2, and PD3. All of the cathodes are
    connected. I am placing a picoammeter in series with PD2 to measure
    the generated photocurrent but I am leaving the anodes of PD1 and PD3
    unconnected. I don't believe that PD1 and PD3 would contribute any
    current, but can someone else verify this for me please?

  2. D from BC

    D from BC Guest

    Picoamp's tiny...
    I wonder if the unconnected anodes on the 2 photodiodes will act like
    antenna's and your picoamp meter will flicker with the strongest AM
    radio station??
    D from BC
  3. usefulfacts

    usefulfacts Guest

    I haven't noticed that kind of affects. I am more concerned with
    things like the open circuit voltage of PD1 or PD3 or their current
  4. D from BC

    D from BC Guest

    This is just a DC point of view...
    Imagine the photodiodes are 100V batteries that are disconnected at
    one end..
    Do you think that will do something..? It shouldn't..There's no
    circuit. (Neglecting Rair..)
    D from BC
  5. MK

    MK Guest

    Thanks, that is basically what I was thinking, but its nice to have
    someone else verify it.
  6. no_one

    no_one Guest

    what is the other side of the picoammeter connected to? The anode of PD2?
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