Re: Need to design precision 5mA constant current source (wide temp range).. need help
From: John Popelish (jpopelish_at_rica.net)
Date: 11/23/04
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Date: Mon, 22 Nov 2004 20:35:18 -0500
stevo wrote:
>
> Hi,
>
> I need to design a 5mA constant current source for a Wheatstone bridge
> application. The problem is the source needs to be +- 3% accurate and
> hold that accuracy over a -40 C to +85 C temperature range.
>
> I have thought about using a simple FET CCS, but don't have much
> experience and am not sure if I can make it accurate enough.
>
> Can any of you more experienced guys point me in the right direction?
>
> Thank You
> Stephen
>
> Ohter info : V avalible +15V; bridge resistance ~ 850 ohms
Are you sure that a constant voltage across the bridge would not
improve its accuracy?
-- John Popelish
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