Diode Losses?

Discussion in 'General Electronics Chat' started by diya khan, Nov 6, 2011.

  1. diya khan

    Thread Starter New Member

    Nov 29, 2010
    18
    0
    Hi

    Do diodes have any other kind of losses, other than conduction losses?
     
  2. jimkeith

    Active Member

    Oct 26, 2011
    539
    99
    Reverse leakage losses are a function of junction temperature and reverse voltage.

    Switching losses are an issue in switching power supplies--a function of switching frequency and reverse recovery time--while the junction is recovering, there is a brief instant when both the reverse voltage and current are high enough to generate serious power dissipation.
     
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  3. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    Yes, they have PARAMETRIC losses. This is due to the change in capacitance depending on the junction voltage, which at radio frequencies can contribute to overall losses and create other bizarre effects. It can be used to advantage in devices like Varactor multipliers and parametric amplifiers, however.

    Parametric losses are somewhat similar to some other physical analogies such as Landau damping or the coriolis effect, where there is no apparent EXTERNAL contribution to the energy, but internally there is an APPARENT net gain (or loss)

    The ability of a child to get a swing swinging without an external "push" is probably the closest mechanical equivalent to parametric amplification we have.

    Eric
     
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