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Sallen Key Filter Question

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newbie_hs

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The below image is from LTC1966 datasheet.
May I know the use of RB
1736931618134.png
 
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danadakk said:
Mitigate bias current generated offset ?
Click to expand...
I thought the same - at first.

But for bias compensation one would chose identical resistance for both inputs. Thus I expect: 38.3k + 169k = 207.3k.
294k seems a bit high.

Thus my second thought: maybe it uses the input capacitance to improve stability.

Sallen-key filters are known to be stability critical.

I don´t know

Klaus
 
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