Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

RE:How to set up a diff equation for circuit with a diode?

  • To: mathgroup at
  • Subject: [mg68825] RE:How to set up a diff equation for circuit with a diode?
  • From: jpigott at
  • Date: Sun, 20 Aug 2006 04:43:43 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

The equation commes from the physics of a p-n junction. The 0.026 in front is really k*T/q, k== Boltzmann's constant, T is temperature in kelvin, q is the electronic charge.

The 10^12 inside is a function of the area ans structure of the diode. it can be thought of as also the reverse leakage current. It changes dramatically with temperature (~ proportional to T^3/2).

Of course there are many reasons why real diodes deviate from this formula. 

series resistance will make higher by I*Rseries. At very low and very high currents, the ln[] function gets modified.

Link to the forum page for this post:
Posted through [[postId=12855]]

  • Prev by Date: LegendPosition Problem
  • Next by Date: RE: combinatorica documentation
  • Previous by thread: Re: LegendPosition Problem
  • Next by thread: Problem with NMaximize