Search for a scope to measure LDO regulator noise and PSRR

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johnli
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Search for a scope to measure LDO regulator noise and PSRR

Post by johnli »

Hi guys,

I am searching for a scope hopefully using it to measure noise and PSRR of a LDO regulator. The simulation results for noise is shown in the attached graph.

For PSRR measurement up to 20MHz, I suppose 5000series scope has function generator up to 20MHz in addition to the scope main functions and therefore can serve such purpose.

Please can you advise me on the noise measurement side? Does the software has Spectral noise density analysis function? Has anyone used PicoScope for noise measurement before?

Thank you and I look forward to your reply :D

Cheers,
John
Attachments
LDOnoisesimulations.png

Gerry
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Re: Search for a scope to measure LDO regulator noise and PSRR

Post by Gerry »

Hi John,

I apologise for the delay in answering (this post got overlooked in the run up to Christmas).

If you are still investigating the PS5000 series for noise and spectral noise density measurements, the I would have to inform you that this would not be a suitable application for this PicoScope series, or for our PicoScope 6 software.

The 5000 series PicoScopes have a relatively large input noise (in comparison to a lot of our other PicoScopes) and for making the measurements in spectrum Mode you would not be able to utilise any of our software methods of noise reduction. Also Our PicoScope 6 software only plots an Amplitude Spectrum of V/Hz and converting to a power spectrum of V^2/Hz (or V/√Hz) is overly complex. You could overcome the Spectrum issue by using our Software development Kit to build an application that will acquire the data in Matlab, and then use their ready made library with a Power Spectrum.

However, if your requirement is not immediate, then we have new technology on the way which is likely to satisfy your requirement.

Regards,

Gerry
Gerry
Technical Specialist

johnli
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Re: Search for a scope to measure LDO regulator noise and PSRR

Post by johnli »

Thanks Gerry.

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