PSN-L Email List Message

Subject: Re: Op amp front end noise
From: George Bush ke6pxp@.......
Date: Wed, 09 Mar 2005 20:48:08 -0800

I am building a mercury-cup tiltmeter and it uses the INA121 opamp. I would
be interested in seeing your analysis of it's noise also.

At 08:57 PM 3/9/05 -0500, you wrote:
>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.
>John Popelish
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