Hi guys,
I need your help a little bit Is here anybody who could help me with design - improved howland current source? I need constant current approximately 500uA with 50kHz and the input signal will be 0.5V. I created some source but the problem is that when I use OP177 and I change kHz or R_load the output current have changed, but when I use OPA277 nothing happen and the I(rms) is 491uA.
Why OP177 does not want to work?
Thank you very much
I need your help a little bit Is here anybody who could help me with design - improved howland current source? I need constant current approximately 500uA with 50kHz and the input signal will be 0.5V. I created some source but the problem is that when I use OP177 and I change kHz or R_load the output current have changed, but when I use OPA277 nothing happen and the I(rms) is 491uA.
Why OP177 does not want to work?
Thank you very much
Attachments
-
21.4 KB Views: 74
-
21.4 KB Views: 68