Reverse Biasing Photodiode Techniques

Discussion in 'General Electronics Chat' started by baseball07, Jun 16, 2010.

  1. baseball07

    Thread Starter Active Member

    Apr 24, 2007
    Hi, I have a question about reverse biasing a photodiode. Is it the same thing if you apply a positive voltage to the cathode, or a negative voltage to the anode? Can either be done and will still be reverse biasing the device? Thank you.
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Measuring voltage is dependent on the reference point. A reverse bias does mean that the voltage across a device is the opposite to a forward or operating bias.

    With respect to the cathode, the anode will be more negative. With respect to the anode, the cathode will be more positive. With respect to circuit ground (the conventional reference point), the cathode will be more positive than the anode, and the anode less positive than the cathode.