Home > Community > Forums > PCB Design > Pspice problem - Remove DC offset from analysis

Email

* Required Fields

Recipients email * (separate multiple addresses with commas)

Your name *

Your email *

Message *

Contact Us

* Required Fields
First Name *

Last Name *

Email *

Company / Institution *

Comments: *

 Pspice problem - Remove DC offset from analysis 

Last post Fri, Aug 31 2012 3:22 PM by pppppp. 2 replies.
Started by pppppp 28 Aug 2012 01:31 PM. Topic has 2 replies and 1410 views
Page 1 of 1 (3 items)
Sort Posts:
  • Tue, Aug 28 2012 1:31 PM

    • pppppp
    • Not Ranked
    • Joined on Tue, Aug 28 2012
    • Posts 4
    • Points 65
    Pspice problem - Remove DC offset from analysis Reply

     Hello!
    I'm using OrCAD 16.5 lite student version for doing some BJT analysis for university.
    How do I remove the DC portion of the signal I view on PSPICE? It is the collector voltage of a very simple
    common emitter  amplifier. I want to compare the output with the input in order to graph them and determine
    the gain.

    I thought of doing it by adding a trace of OUTPUT-AVG(OUTPUT) but it is not as exact as it should because
    of the first part of the signal, that little irregular transient.
    Any ideas on how to do it? I have seen other programs have an AC probe  or AC-coupled probe..but none
    of them had the Pspice signal math capabilities, or at least i did not foud them.

    Thanks in advance.

     

    Filed under: , ,
    • Post Points: 20
  • Tue, Aug 28 2012 8:48 PM

    • alokt
    • Top 25 Contributor
    • Joined on Fri, Aug 22 2008
    • Noida, Uttar Pradesh
    • Posts 241
    • Points 3,470
    Re: Pspice problem - Remove DC offset from analysis Reply

     PSpice does not have AC coupled probe or AC mode as found is oscilloscopes. Output- AVG(OUTPUT) would not give the desired result. if DC value is constant and known, you may want to plot the waveform by subtracting that. 

    Other alternative could be adding a appropriate value of capacitor in series and creating a dummy node in circuit. This node would be just for  observation purpose. 

    • Post Points: 20
  • Fri, Aug 31 2012 3:22 PM

    • pppppp
    • Not Ranked
    • Joined on Tue, Aug 28 2012
    • Posts 4
    • Points 65
    Re: Pspice problem - Remove DC offset from analysis Reply

     Thank you alokt.Then i should do everything manually :D

    Have a nice day.

    • Post Points: 5
Page 1 of 1 (3 items)
Sort Posts:
Started by pppppp at 28 Aug 2012 01:31 PM. Topic has 2 replies.