ADS1261: ADS1261 AC excitation

Hi Kang Shuo Chang,

Interesting question, what kind of sensor are you using that has 1/f noise? And is the 1/f specified in the sensor datasheet, or are you just assuming that the sensor will have some amount of measurable 1/f?

If you could provide the datasheet or similar documentation for the sensor we can review

-Bryan

https://www.nve.com/Downloads/SB-00-101_Noise-in-TMR-NVE-Magnetometers.pdf

My sensor is TMR. Thank you.

However, according to this paper, AC excitation seems to eliminate 1/f noise.

www.analog.com/.../understanding-and-eliminating-1-f-noise.html

Hi Kang Shuo Chang,

It doesn't look like the article you linked to provided any measurement data to support the claim, so I'm not really sure what to make of that. The paper I included effectively implements the exact system you are describing and then shows how the measured spectrum has a 1/f component. Again, I haven't taken data myself so I cannot guarantee you that my statements are fact, but the information I have suggests that they are.

I'd also guess that the TMR manufacturer would promote the fact that AC excitation is a valid way to remove the sensor 1/f noise and improve measurement performance. I didn't see anything about this on their website, are you able to find any information from them about this topic?

If you find any conflicting information or end up taking measurement data, please let us know

-Bryan

Thank you, Brian. I tried an experiment with AC excitation, but it didn't help reduce the sensor's 1/f noise.