Part Number: INA2191
Dear seniors
I am currently encountering a very strange problem using INA2191 A3.
Please also take the time to help provide comments or guidance.
I use an INA2191 A3 to measure the current of my circuit. From 0uA ~200uA. Use ADC to measure and obtain data and then convert.
It should be linear in use (or increase as the VGS of the MOS increases).
But, this is a very strange phenomenon. If I sample 1000 points. Indeed, the corresponding current is obtained. (The error is about 4uA).
But when my sampling rate becomes faster, the current becomes very unstable. It will show the pattern of Sine wave.
When measured using an oscilloscope, the signal does indeed jump up and down like a sin wave.
So I would like to ask, is my design wrong? Or is there something wrong with my operation?
Please also provide some opinions. Thanks
Simon
