PSN-L Email List Message

Subject: Re: Op amp front end noise
From: ChrisAtUpw@.......
Date: Thu, 10 Mar 2005 19:39:30 EST


 
In a message dated 10/03/2005, ke6pxp@....... writes:

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.



Hi George,
 
    I don't know if you could tolerate an input current  of 5 nano Amps, 
rather than 4 pico Amps? The INA118 has about  1/3 the 0.1 to 10 Hz voltage noise 
and about twice the CMRR range. This is the  one that I use with differential 
photocells. 
 
    Regards,
 
    Chris Chapman





In a message dated 10/03/2005, ke6pxp@....... writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I am=20 building a mercury-cup tiltmeter and it uses the INA121 opamp. I would
= be=20 interested in seeing your analysis of it's noise=20 also.
Hi George,
 
    I don't know if you could tolerate an input cur= rent=20 of 5 nano Amps, rather than 4 pico Amps? The INA118 has abo= ut=20 1/3 the 0.1 to 10 Hz voltage noise and about twice the CMRR range. This is t= he=20 one that I use with differential photocells.
 
    Regards,
 
    Chris Chapman

[ Top ] [ Back ] [ Home Page ]