Re: Current mirror for bipolar current

On Wed, 16 Jul 2008 06:56:00 -0700 (PDT), spilla@xxxxxxxxxx wrote:

I would like to use a current mirror for both polarities of input
current. I have found many references about current mirrors, but there
is always only positive or negative version. I also need the load
(connected to the mirror) to be grounded. Could anyone recommend me
any tricks? Thanks

The Howland circuit is OK at low currents.

http://www.national.com/an/AN/AN-1515.pdf


For higher current stuff, this is an interesting starting point:

ftp://66.117.156.8/Isource.JPG


John

.

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