Help with Circuit

Discussion in 'Homework Help' started by sheheryar_noor, Jun 3, 2010.

  1. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    Hi everyone i got project from someone

    Here is the Project
    Code ( (Unknown Language)):
    1. www.stanford.edu/class/ee122/Spice_Decks/pspicedemo.pdf
    And i did the same what the pdf file tells

    Here yall can see the video which i made

    Code ( (Unknown Language)):
    1. http://rapidshare.com/files/390247187/CaptureWiz005.wmv
    Or

    Code ( (Unknown Language)):
    1. http://www.youtube.com/watch?v=4G82E2uDP2A
    But rapidhsare one's quality is good


    Circuit Pic
    [​IMG]


    [​IMG]


    The graph which i want to invert
    [​IMG]

    Can someone help me with inverting the graph?
    What should i add in the circuit to invert the graph?
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    OMG
    Spice AC analysis don't show "minus" sing.
    You must use phase marker or transient analysis to see that signal is invert.
     
  3. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    Bro actually i am not a student of Electronics
    It is a project of my friend
    He is in the hospital so i am doing it for him
    I am very new to this thing
    I didn't get u
    Can u explain me what should i do to invert the graph?Or move it from down to top?
    My graph moves from top to down how can i change it to move it from down to top?
     
  4. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Ok ... how do you invert any number?

    Since this is a homework assignment, I'm sure the professors can do whatever they wish and not make a lick of sense, so they must be checking to see if you know how to invert a number.

    Then you can add any bias you wish to make the scale whatever.
     
  5. Eng_Bandar

    Active Member

    Feb 27, 2010
    50
    1
    you want invert gragh from what to what ?
    more details please
     
  6. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    From my understanding, they want to invert the sweep ... something like the attached.

    I applaud his efforts in helping his friend.
     
    • BS.PNG
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  7. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    Look at this Pic it is a graph of Vout
    It moves from 2.0V to 1.0MHZ means from top to bottom
    And i want it to move it from down to top
    Here the pic is


    [​IMG]
     
  8. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    What did the instructor say for this assignment .... you never answered that question.

    I imagine this is what you want ....
     
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    Last edited: Jun 4, 2010
  9. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    Joe how did u do that?
    Can u tell me please
    how did u change the graph?
     
  10. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    go back and look at my last graphic ....

    The guessing game is over. You need to specify what the professor wanted, not in your terms, but in the terms the professor used.

    This is my last post until the requirement above is met.

    As far as what I did, it's written right there on each graph.
     
  11. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    Joe thanks 4 keep replying
    i was in the hospital with him
    His friends just draw red lines on ur screenshots to give me a clue
    Look at these red lines i want graph like these red lines
    [​IMG]


    [​IMG]


    And i hope that guessing game is over

    Is it enough or i should get something more to make u understand?

    Thanks again

    Let me know if u can make like these Ok
     
    Last edited: Jun 5, 2010
  12. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    The problem is the original circuit is a low pass filter. You originally stated you wanted it inverted, which could mean the objective was to make it a high pass filter (my last graph).

    So far, you've gotten opinions from your friend and his friends ... yet not one word from what the professor stated or a hint and what the professor was seeking with the exercise.

    In your first picture ... the student had a lower output high pass filter than I did. That may be well and good, but losing 10 dB might not be what the professor had in mind.

    In your second picture, the student had a bandpass (cutting off both the low frequencies and high frequencies) filter. Again, this may not be what the professor had in mind and it does not fit your description of inverted.

    You are a good friend to take on this tasking. Why can't you approach the professor and see what they wanted?
     
  13. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    Correct i must ask the professor
    And Thanks alot
    Can u make both of them?I hope u can coz u got everything from the graph
    I will ask the professor
     
  14. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
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    what should i ask professor? That if he wants High pass filter and how much db he wants to lose?
    Or what should i ask?
     
  15. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Tell him the whole story of you assisting your friend ... and your here to clear up what you described as "inverted" to this forum, including how you came up with the "inverted" line.
     
  16. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    i will ask him if he needs high pass filter and how much db wants to lose?
    or i shud ask something more too?
    or u want me to ask him what do u want?
     
  17. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Your the one talking with the professor.
     
  18. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    yup i will be the one to ask professor
    Tell me what should i ask which can make u understand easily and clearly?
     
  19. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    clear up what was meant when you said ... invert graph.
     
  20. sheheryar_noor

    Thread Starter Member

    May 22, 2010
    32
    0
    O.K i will ask Sir what did u mean by inverting the graph?
     
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