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opa659

Akash Gupta
Prodigy 60 points

Other Parts Discussed in Thread: OPA659, OPA657

sir,

i am designing a very low noise ,low input bias current for an amplification factor of 10000-100000.

so i need to cascade 3 opa659 ICs..

So will it work without considerable noise if i use 3 IC (opa659) in cascade?

  • 0
    TI__Genius 12631 points

    Hello Akash,

     What are your bandwidth requirements? You want to put as much gain in the 1st stage to maximize your SNR. The noise will be dominated by the noise gain from the 1st stage. TINA Spice has the ability to simulate noise and I would recommend doing so. Not knowing your full circuit, I think your noise would be 8.9nV/rt(Hz) * Gain of 1st stage. I would recommend simulating your circuit with the OPA657 as well as this is a lower noise/higher bandwidth part.

    Samir