Pspice CMOS Inverter

Discussion in 'The Projects Forum' started by Runs212, Sep 12, 2015.

  1. Runs212

    Thread Starter Member

    Mar 12, 2015
    55
    1
    I'm trying to design a cmos inverter on pspice (just started using it this week) but I'm not quite getting the correct waveform. Below pictures shows my schematic and output graph. What am i doing wrong here?




    upload_2015-9-11_23-18-50.png upload_2015-9-11_23-19-25.png
     
  2. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    What is wrong about the wave form? The fact that it's going to negative 5 volts and there is no such supply voltage?
     
  3. Runs212

    Thread Starter Member

    Mar 12, 2015
    55
    1
    Yes, I expect it to switch from 0 to 5v.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,802
    1,105
    Put your V- probe be on the ground rail.
     
  5. WBahn

    Moderator

    Mar 31, 2012
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    When the voltage on the input node is 0V and the voltage on the output node is 5V, what is (Vout - Vin) equal to?

    When the voltage on the input node is +5V and the voltage on the output node is 0V, what is (Vout - Vin) equal to?
     
  6. eetech00

    Active Member

    Jun 8, 2013
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    I agree with Alex_t....:cool:
     
  7. WBahn

    Moderator

    Mar 31, 2012
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    Alex_t's suggestion certainly solves the problem. I'm just trying to get the TS to understand WHY they are seeing what they are seeing.
     
  8. md yasir

    New Member

    Sep 14, 2015
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    use pulse of
    v1=0
    v2=5v
    td=0
    tr=0
    tf=0
    pw=0.5m
    per=2m
     
  9. WBahn

    Moderator

    Mar 31, 2012
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    How will that help?

    Having 0 rise and fall times can cause problems for the simulator. But even if it doesn't, how does this help answer the TS's question?
     
  10. md yasir

    New Member

    Sep 14, 2015
    16
    0
    i just tried @WBahn in pspice 9.2 student version
     
  11. WBahn

    Moderator

    Mar 31, 2012
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    So? Again, how does that help the TS solve their problem. Their simulation was running fine. They were just having trouble understanding the values it was producing.
     
  12. Runs212

    Thread Starter Member

    Mar 12, 2015
    55
    1
    It was resolved. I probe should have placed at gnd. You notice i placed V- at the 5V source. Thanks everyone for your contributions and clarifications.
     
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