Thanks for your assistance. I've been encountering some issues regarding this filter. I am still experiencing op amp saturation (I did change the feedback loop from the earlier posted schematic to negative feedback) at the output of the first stage of…
I built the circuit with the OPA2137, the dual version of the OPA137, and it worked. The accuracy of the secondary current was off a little. So I put a pot in place of the 50 ohm resister, and tuned it to 52.2 ohms. At 52.2 ohms, the current tracks the…
Uli, I doubted the resistor tolerance and tested the circuit by hooking up the opamp inputs to ground instead of connecting them across the sense resistor, I got about 0.3mV output.
With a tolerance of 1%, the gain can vary from 9.8 to 10.2
The reason…