Which integrator

[green]

I have two detectors both PI GB one is using a single input integrator and the other is using a differential integrator, both circuits needed a small value multiturn pot to smooth out EF.

My target sample is 5us and GB is 130us minus EF 125us. These wide samples cause ripple on the output of both integrator types especially when a magnet of magnetic soil is waved over the coil, so I added a 2 pole LPF filter to the outputs of both integrators to smooth the output.

Final note the GB point between both integrator types is different. The differential integrator one has a GB delay from target sample of 18us, whereas the single input integrator has a GB delay of about 27us.

When you wave the magnet over the coil do you see a difference between the two integrators when looking at the LPF output with a scope? For me the single input integrator looked a lot better. What is your target delay time?

[mickstv]

When you wave the magnet over the coil do you see a difference between the two integrators when looking at the LPF output with a scope? For me the single input integrator looked a lot better. What is your target delay time?

Hi Green the single ended integrator is a smoother than the diff one. The target delay is about 8us.

[green]

Hi Green the single ended integrator is a smoother than the diff one. The target delay is about 8us.

Thanks