LNA using ORCAD

Discussion in 'The Projects Forum' started by E-girl, Apr 10, 2006.

  1. E-girl

    Thread Starter New Member

    Nov 21, 2003
    3
    0
    hi all..

    I have to design a Low Noise Amplifier using ORCAD, and to compare the signal-to-noise ratio of the input source with the signal-to-noise ratio at the output.

    I found a circuit and I have used a normal vsin input source with frequency 1MHz, but I dont know how to obtain the signal-to-noise ratio for the input and the output.

    any help :unsure:
     
  2. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    4
    The simple version is you do a .noise analysis with AC analysis frequency you are interested in and then just convert the results into appropriate dB values.

    You have to read the OrCAD PSpice manual on how to do noise analysis. If you need more detailed information you could google for noise analysis using SPICE. There are plenty of informations out there. A simple example is given in this page.

    If you have access to library, you could borrow books on SPICE, like Tuinenga or Roberts. These are pretty good book for beginner.
     
  3. dbwgwee

    Member

    Mar 30, 2006
    14
    0
    This is totally subFzero. (Anyone know where I can find a blunt razor?) I have a serious question...where can I find an answer?
     
  4. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    4
    A serious question deserves a serious answer. Let's find it together... :p
     
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