Re: Offset voltage on voltage follower
From: Jonathan Kirwan (jkirwan_at_easystreet.com)
Date: 08/21/04
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Date: Sat, 21 Aug 2004 03:25:43 GMT
On Sat, 21 Aug 2004 01:50:07 GMT, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:
>and added
>the constraint that the output impedance should be just lower than
>2.5K
Output impedance is:
R*(2R)*(6R) 12*R^3 3
----------------------- = ------ = - * R
R*(2R)+R*(6R)+(2R)*(6R) 20*R^2 5
So, R = (5/3) * desired impedance, in this case.
Not much left for the OP to do, I suppose, except get rid of that opamp-twisting
pot on the offset null pins.
Jon
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