Amplifier design

Discussion in 'Homework Help' started by yifei87, Sep 19, 2008.

  1. yifei87

    Thread Starter Member

    Sep 7, 2008
    16
    0
    My question is to design an amplifier and can be used nice in noisy ebvironment. what software to show usually?
    Thanks for help
     
  2. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    Hi,

    For this application, you need high PSRR amplifiers and to make it as low impedance as practical. You must employ proper PCB design techniques and maybe consider a copper shield around the circuitry.

    Steve
     
  3. yifei87

    Thread Starter Member

    Sep 7, 2008
    16
    0
    What type of amplifier should i design for my question?
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Design a differential amplifier with a high common gain rejection ratio.

    What is the environment?
     
  5. yifei87

    Thread Starter Member

    Sep 7, 2008
    16
    0
    no much requirement needed, just need to eliminate noise in a hish noise signal environment. by the way, why high common gain rejection ratio needed ?thanks for help
     
  6. neon9

    Member

    Oct 8, 2008
    15
    0
    you want help but refuse to give particulars. where are we supposed to find out the source of the noise P.S. ,eniroment ,signal , emf, not to mention others. the noise DB rejection only apply to P.S. has nothing to do with the other noises like gnds.
     
    Last edited by a moderator: Oct 8, 2008
  7. yifei87

    Thread Starter Member

    Sep 7, 2008
    16
    0
    my input source is 50uV, n i would like to amplify it to few volt.

    I start with a differential amplifier and the lower part of my differential amplifier is a constant current source. All is ok but when i wanna test about the noise elimination by connect differential input to a common signal, that the noise, meaning 2 input of differential i put the same source, but the stimulation result show that i didn't eliminate the signal( noise). How can i solve it or what should i add to solve my problem?

    pls help, urgent...
     
  8. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If you can post up a schematic, we might be able to help. We need to know if the amp works with an AC or DC signal and the nature of the environmental noise.
     
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