PSN-L Email List Message

Subject: Re: Op-Amps
From: Douglas Gavilanes gavilan1@.............
Date: Thu, 10 Mar 2005 15:37:12 -0800

psn-l-digest-request@.............. wrote:

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>Subject: Op amp front end noise
>From:    John Popelish 
>Date:    Wed, 09 Mar 2005 20:57:24 -0500
>I am getting pretty deeply into the design process for a velocity coil
>seismometer amplifier and filter and have decided to try ot quantify
>the relative noise performance of various candidate opamps versus coil
>resistance.  Here is the list of low noise and general purpose types
>(which I have on hand) that I am comparing:
>Do you have any suggestions for other candidates I might evaluate?
>My biggest difficulty in completing this task has been resolving the
>wide variation in noise specifications for the various types to
>produce a valid comparison in the DC to 10 Hz frequency range,
>especially comparing the chopper types to the others.
You might try the OP80A, which is very low noise and has a high input 
impedance.  A decent second could be the LF356, unless you're locked 
into another package.  Just a thought.  Of course, the OP80 is out of 
production now, I believe, but if you can find some, let me know!  

Doug Gavilanes
Garden Grove, CA.


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