Plotting Diode Point-Contact with PSPICE for Circuit Analysis

Click For Summary

Discussion Overview

The discussion focuses on using PSpice to plot the characteristics of a point-contact diode within a circuit analysis context. Participants are addressing issues related to the correct plotting of diode voltage versus source voltage.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests assistance in generating a specific plot for a point-contact diode using PSpice, providing circuit values and expected outcomes.
  • Another participant suggests that the issue may relate to the order of operations in the expressions used for plotting.
  • A different participant clarifies that the problem is not related to the order of operations but rather the x-axis variable being used in the plot.
  • It is noted that the correct plot should display the diode junction voltage on the x-axis instead of the source voltage.
  • Further confirmation is provided that changing the x-variable to the diode voltage is necessary for achieving the desired plot.

Areas of Agreement / Disagreement

Participants generally agree that the x-axis variable needs to be changed to correctly reflect the diode voltage, but the initial cause of the plotting issue was debated.

Contextual Notes

Participants did not specify any limitations or assumptions regarding the circuit setup or PSpice settings that might affect the plotting results.

Who May Find This Useful

This discussion may be useful for individuals working with PSpice for circuit analysis, particularly those interested in diode characteristics and plotting techniques.

Dexterous
Messages
10
Reaction score
0
Hello i need to show with pspice plot the point-contact of diode.
this is the circuit and the values i need:
117Untitled.png

250Untitled1.png


the right solution should look like this plot
662_1.png


but this is the plot i see

543Untitled2.png


thx in advance!
 
Physics news on Phys.org
I'm not too familiar with PSpice's equation plotting details, but I do notice that there is a difference in the format of the expressions that your diagrams show. Do you need the parentheses to make the order of operations clear?

attachment.php?attachmentid=63490&stc=1&d=1383228309.gif
 

Attachments

  • Fig3.gif
    Fig3.gif
    3.3 KB · Views: 661
im aware to this difference its not the case thx..
 
Okay. I noticed something else... The "good" plot has V(D1:1) on the x-axis. Your plot has V_V1. Presumably that means the good plot is plotting the other quantities against the diode junction voltage, whereas yours is plotting against the swept source voltage value.

You need to figure out how to place the diode voltage on the x-axis of your plot.
 
  • Like
Likes   Reactions: 1 person
looks like you right!
thx..
 
yea, the man is right you just need to change your x-variable... go to plot->axis settings->x axis->axis variable and put v(d1:1).
 
  • Like
Likes   Reactions: 1 person

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 18 ·
Replies
18
Views
4K
  • · Replies 1 ·
Replies
1
Views
5K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 29 ·
Replies
29
Views
7K
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 13 ·
Replies
13
Views
3K