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how to achieve an opamp gain using a differential amplifier

santosh sawal
Prodigy 100 points
Other Parts Discussed in Thread: THS4524

Hello,

I want to achieve a gain of 2000 using a rail-to-rail output differential op-amp.

op-amp that i have selected is a THS4524. quad configuration.

for 2 opamps i will be using a unity gain. for one opamps i want a gain of 2000.

can anyone suggest as to how to proceed.

regards,

S.S

 

  • 0
    TI__Genius 13935 points

    A single stage gain of 2000 is very challenging.  That makes the ratio of Rf and Rg very large, offset voltages can be a problem and the bandwidth of this device would be about 46kHz at that gain.  The output noise would be 8.9uV/rt Hz, or almost 2mV across the 46kHz of bandwidth.   

    If you used two stages of 44.7V/V on each stage it would probably work better, but the noise would still be an issue with that much gain. 

    Does this application require a large SNR?