Hello,
I am using 10 mili Ohms for current measurements on the low sides of Mosfet bridges. The problem I am facing is, there is too much noise with signal at the outputs of Opamps O3, O4. I have low pass filter on IPx pins with cutoff frequency of 1.6KHz. The noise is mainly due to switching of mosfets. There is overshoot of current due to switching which is carried to output of opamps. Please have a look of waveforms and suggest me some ways to improve output signal quality.
Fig1: 1st Channel is PWM signal for Low side Mosfet and 2nd Channel is Opamp output
Fig:2 Zoomed out version of above wavefroms. 1st Channel is Opamp output and 2nd is PWM signal for low side Mosfet
Regards
Ganesh
