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Differential Op amp CMRR

Discussion in 'General Electronics Discussion' started by pump, Nov 4, 2011.

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  1. pump

    pump

    24
    0
    Nov 4, 2011
    Hi,

    I need to design a differential op-amp circuit that has a minimum CMRR of 50dB and a max input voltage of 1mV

    If anyone could point me in the right direction it would be great

    Cheers
     
  2. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Hi Pump,

    Welcome to this forum. Differential op amp can be build on various way by using 1 to 3 op amp. The CMRR is frequeny depending.
    If your desgin is theoretical you can be in a perfect world an choice the 1 opamp design with very tight components specifications. Practical design would probably be a 2 or 3 op amp one.

    Just google a little bit and you will find many informations, mainly on analog devices and Texas Instruments sites. TI even offer a free simulation package.
    Olivier
     
  3. pump

    pump

    24
    0
    Nov 4, 2011
    Hi Thank you for your responce.

    It is just theroy and will keep looking

    Thank you
     
  4. foTONICS

    foTONICS

    332
    9
    Sep 30, 2011
    i believe shorting the inputs and using an external trimpot until your output has a CMRR of 50dB is a nice way of doing it
     
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