LTspice Simulation

Discussion in 'General Electronics Chat' started by lkgan, Mar 10, 2011.

  1. lkgan

    Thread Starter Member

    Dec 18, 2009
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    Hi,

    I am currently having some simulation problem using LTspice. When I do sweeping at AC, can I sweep one of the DC voltage source in my circuit at the same time? Meaning to say that I want to observe multiple frequency response in the plot with different DC biasing voltage. Anyone has any idea?

    Regards,
    lkgan
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    Why not add a DC bias to the schematic?
     
  3. lkgan

    Thread Starter Member

    Dec 18, 2009
    117
    0
    Hi Bill,

    Yes, there's a DC bias in the schematic. I need to sweep the DC bias and at the same time sweep AC to get the frequency response. For example, when DC = 1V, I want to see one frequency response, then next is when DC = 2V, another frequency response to be appeared. I want to see multiple frequency response in a plot. Is that possible in LTspice?
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    You can do it like this.
     
    lkgan likes this.
  5. lkgan

    Thread Starter Member

    Dec 18, 2009
    117
    0
    Hi Ron,

    Thanks for the hint. By the way, I used a different way. At the AC Analysis edit simulation command, I typed Ctrl+M and it allows me to key in the command [​IMG]".step param Vbias 0 2 0.5" as shown in attach.

    By the way, may I know where can I get more information on editing the SPICE directive, more information on other commands?

    Regards,
    Leong Kit
     
  6. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    656
    The LTspice help file is my only source of information on directives.
     
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