From the datasheet for LTC6082 (60812fd.pdf), there is an example of nanoamp current source.
I couldn't find any detail explaining this circuit. How would I change it to make it operate between 1uA to few microamps (bidirectional)? Would change 10Mohms to 10kohms would greatly degrade the performance? I can see the bottom two OPs are part of an improved Howland current pump that is part of a the negative feedback loop.
What does the top OPAMP do with the FB? It'd be awesome if someone could write a follow-up article on this 3-OPAMP like Nick's article. Thanks.
Clarifies it's still a bidirectional current.
[edited by: Besty at 6:09 AM (GMT -4) on 9 Jun 2021]