[sdiy] Linear current source - temperature compensation?

Tim Ressel timr at circuitabbey.com
Sat Nov 12 19:47:52 CET 2016

The transistors are for the linear-to-expo conversion. If you just want 
linear response then the whole section is superfluous and you can just 
use a simple linear current source.

I've always favored the heater method over the tempcos. They have been 
very stable over the years. National Semi app note AN-299 covers it, if 
you can find it. Thanks, TI.


On 11/12/2016 5:29 AM, Justin Owen wrote:
> Hello,
> The classic Electronotes current source has a linear input. It's possible to chop out some of the exponential parts and just have a linear current source based on that design - however, you lose the two standard Tempco placement positions.
> So - is it possible to temperature compensate a linear-only current source?
> 1) Please ignore the component values...
> 2) I'm assuming the same temperature variation/dependance exists in the linear version...
> http://www.sdiy.org/juz/source_exp.png - exponential
> http://www.sdiy.org/juz/source_lin.png - adapted to linear only
> Thanks,
> / Justin
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--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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