Simulate Leakage Current - Reverse Bias Diode

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Discussion Overview

The discussion revolves around simulating leakage current in a reverse bias diode using LTSpice. Participants explore how to model this phenomenon, including the necessary parameters and file formats for simulation.

Discussion Character

  • Technical explanation, Experimental/applied, Debate/contested

Main Points Raised

  • One participant seeks guidance on simulating leakage current from a reverse bias diode.
  • Another participant suggests including a parameter Roff for off resistance in parallel with the ideal diode model.
  • A participant mentions the need for a .model statement to define the diode model and inquires about the .net file for LTSpice.
  • Instructions are provided on how to modify the diode model in LTSpice, including copying and pasting the model as a .model SPICE directive.
  • One participant notes the substitution of a different diode (1N750) due to the unavailability of the RB411D diode in their LTSpice version, and discusses adjusting the Is parameter to modify leakage.
  • A clarification is made regarding the distinction between the RB411D Schottky rectifier diode and a Zener diode, highlighting the differences in schematic symbols.

Areas of Agreement / Disagreement

Participants express varying levels of familiarity with LTSpice and its components, leading to differing approaches and suggestions for simulating the leakage current. No consensus is reached on a single method or model.

Contextual Notes

Some participants mention missing files or specific diode models, which may limit their ability to simulate the leakage current effectively. There are also unresolved questions about the correct input methods for LTSpice.

Who May Find This Useful

Individuals interested in diode simulation, particularly those using LTSpice for circuit modeling and analysis.

cheniour oussama
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TL;DR
leakage current in a diode with ltspice simulation
hello I m Trying to simulate leakage current, say from a reverse bias diode I'm fairly
how i can do it
 
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cheniour oussama said:
Summary:: leakage current in a diode with ltspice simulation

hello I m Trying to simulate leakage current, say from a reverse bias diode I'm fairly
how i can do it
The model should have a parameter Roff that allows you to put in an off resistance in parallel with the ideal diode.
 
phyzguy said:
The model should have a parameter Roff that allows you to put in an off resistance in parallel with the ideal diode.
how please
1624131509721.png
 
It will be in the .model statement which defines the diode model. Do you have the .net file created by LTSpice? It will be a text file which is the input to the SPICE simulator.
 
no i i have' nt .net file for this circuit but how i can I input the file please ?
 
Diode_Leakage_Schematic.png

Diode_Leakage_.png


Attached are LTspice .asc and .plt files. Remove the .txt extension so you can run them.
Right click on diode to change model, or Left click over the diode terminal to plot current.
 

Attachments

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I don't have that RB411D diode in my version of LTSpice, but I substituted another Zener, 1N750. What you want to do is when you select the diode, you copy the model and paste the model as a .model SPICE directive on the schematic. Then you can edit the model parameters. The easiest way to adjust the diode leakage is to adjust the Is parameter. I did that in this asc file.
 

Attachments

The RB411D is a Schottky rectifier diode, not a Zener diode.
Notice the suBtle schematic symbol 'Z' of the Zener cathode, and the 'S' of the Schottky cathode.
 
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