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transfer function in small signal mosfet model

Discussion in 'Electronic Design' started by Matteo, Apr 8, 2007.

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  1. Matteo

    Matteo Guest

  2. Jim Thompson

    Jim Thompson Guest

    Sure can. However I won't. If you can't do loop and nodal analysis
    you should choose another trade.

    ...Jim Thompson
     
  3. Jim Thompson

    Jim Thompson Guest

    See....

    Newsgroups: alt.binaries.schematics.electronic
    Subject: transfer function in small signal mosfet model (from S.E.D) -
    TransferFunctionSED.pdf
    Message-ID: <>

    ...Jim Thompson
     
  4. Matteo

    Matteo Guest

    thank you very much Jim! I used nodal analysis as you suggested and I
    got an enormous transfer function! Hope it's right..
    do you know about some good book about the project of analog radio
    frequency amplifiers where I can find examples and theory?

    thanks again and sorry for my english
     
  5. Jim Thompson

    Jim Thompson Guest

    I wouldn't expect an "enormous transfer function". Post your work.

    ...Jim Thompson
     
  6. Matteo

    Matteo Guest

    Il Thu, 12 Apr 2007 09:44:33 -0700, Jim Thompson ha scritto:
    here is my work ..hope it's allright! but I don't think so :p
    http://www.thebags.it/listing/ampli/fdc0001.PDF
     
  7. The Phantom

    The Phantom Guest

    I notice that you morphed Rd into Ro at the beginning of all the algebra;
    I'll stick with Rd.

    There is more than one kind of transfer function, such as the short circuit
    transfer admittance and the open circuit transfer impedance, etc., but I
    assume that what you want is the voltage transfer ratio.

    The numerator is:

    -gm Rd + Rd Cgd s

    The denominator is:

    ( Cds ( Cgd + Cgs ) - Cgd ( 2 Cgd + Cgs )) Rd Rs s^2

    + ( Cds Rd + Cgs Rs + Cgd ( Rs - Rd + gm Rd Rs )) s + 1

    One of us made a mistake in the algebra! :-(
     
  8. Jim Thompson

    Jim Thompson Guest

    And I dropped an "S" in my first page start :-(

    ...Jim Thompson
     
  9. Matteo

    Matteo Guest

    Il Thu, 12 Apr 2007 14:19:30 -0700, The Phantom ha scritto:
    can you check your denominator? because mine is:

    ( Cds ( Cgd + Cgs ) + Cgd Cgs ) Rd Rs s^2

    + ( Cds Rd + Cgs Rs + Cgd ( Rs - Rd + gm Rd Rs )) s

    + 1

    thanks! ;)
     
  10. The Phantom

    The Phantom Guest

    I carefully checked and found that I had made a single sign error. I agree
    with your result with the exception of a single sign, which I have
    indicated.
    I get a plus sign here: ...Rs + Rd...
     
  11. Matteo

    Matteo Guest

    The Phantom ha scritto:
    I carefully checked again and I get a plus sign too!
    thank you very much for the help!

    matteo
     
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