PreAmp designing-Please help

Discussion in 'The Projects Forum' started by Michael1989, Feb 14, 2012.

  1. Michael1989

    Thread Starter New Member

    Feb 14, 2012
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    0
    Hello,

    So i need to design and make a pre- amplifier with the following specifications.
    Runs on a 3.3-5 volt supply
    Gain levels from 10-50dB
    Must function from 5-50kHz
    Low noise levels

    I was wondering if anyone had any ideas of were i should start below are some of the calculations that i have done to help me select my opamps.

    50dB=316.23V/V
    316.23V/V x 50KHz=15.8 MHz
    Now that my signal will also be filtered i know that i will need to raise it to probably around 100KHz accepted by my filter.

    Thought about using an AD8099
    Has a small signal bandwidth of 500MHz -Slew Rate 1.6KV/us -Vos of 200uV Noise Density of 950pV/rtHz and fits my voltage level limits

    Wondering if anyone knows of how i should go about this project and picking resister and capacitor values.
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Last edited: Feb 14, 2012
  3. Michael1989

    Thread Starter New Member

    Feb 14, 2012
    4
    0
    Thank you for the response so quickly. I think i am allowed two stages. To my memory i forget the downsides or upsides to using a two stages. I have also attached a beginning design i have come up with not sure how to actually figure out the values.
     
  4. bertus

    Administrator

    Apr 5, 2008
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