Electronics > Metrology

Noise on LiPo batteries?

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alanambrose:
Hi,

Has anyone measured the noise (or is in a position to measure the noise) on LiPo batteries? I've seen the old Nist paper which suggests that AA NiCd are lowest noise. But Nist didn't test LiPo batteries in that study - and on the 'source resistance is responsible for the battery noise' theory, which the Nist paper suggests - then LiPo batteries should be good ... and maybe even lower noise than NiCd.

Anyone?

Alan

Cerebus:
And further, what's the likely noise performance of EDLC super-capacitors as a power source? If the ESR Johnson noise is the key they ought to perform rather well.

DuPe:
is there a reference to the NIST paper that you are referring to?

Zeranin:

--- Quote from: alanambrose on May 05, 2016, 02:00:15 pm ---Hi,

Has anyone measured the noise (or is in a position to measure the noise) on LiPo batteries? I've seen the old Nist paper which suggests that AA NiCd are lowest noise. But Nist didn't test LiPo batteries in that study - and on the 'source resistance is responsible for the battery noise' theory, which the Nist paper suggests - then LiPo batteries should be good ... and maybe even lower noise than NiCd.

Anyone?

Alan

--- End quote ---

I have also read a paper on the noise of various battery chemistries, can't remember if it was a NIST paper. From memory, they had to use correlation methods to even measure the noise at all, it was so low. I have always used a battery as a low noise DC voltage source, for testing noise performance of very-low-noise equipment. Out of interest, what is you application that calls for such a low noise source?

DuPe:
Are we talking about the attachment?
If yes, measurement is going to be a real challenge:
They are talking about 200dBV/sqrtHz precision

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