[Moved] Choosing OP-amp for a Sallen-Key filter

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orionsbelt

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Hello,

I am designing a sallen-key filter for one of my projects. I am looking for a very low-noise, low power Operational amplifier for this filter. There are a lot of op-amps out there and I am having hard time choosing one. Any recommended op-amp for such filter?

Please find attached document where the schematics of the filter is presented.

Regards
OB
 

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  • Sallen-Key Filter.pdf
    319.9 KB · Views: 84

Since your cutoff frequency is so low (25 Hz), you've got many,many options. All the manufacturers have search tools on their websites. Just enter your required noise and power, or just sort their opamps according to one of the parameters, and then pick one. There's no "right" one. If it meets your specs, then use it. You might also want to consider cost and availability.

You could also use the simulation tools on the manufacturers website to evaluate a particular opamp.

Have fun!
 
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