[time-nuts] Low noise powersupplies

Chris Albertson albertson.chris at gmail.com
Thu Aug 7 16:41:32 EDT 2014


Just practical question..

How would one measure noise at this level?  If I were evaluate this what
would I need?  My scope lacks a nV/dev setting so is there some way to tell
the difference between this and an LM317?  Seriously, what kind of
instrumentation would I need before I could measure an improvement over my
"standard" LM317



On Wed, Aug 6, 2014 at 11:38 PM, Ole Petter Ronningen <olepr01 at gmail.com>
wrote:

> Hello, all
>
> I thought it may be of interest to some of the members of this list that TI
> is selling evaluation modules for some ultra low noise regulators for $20
> in their estore, shipping world wide included. The specs looks pretty
> decent to me, and I've ordered up a couple of boards to use as "clean up
> boxes" for my bench-supplies, to use on noise-sensitive projects.
>
> 1.4-30v output TPS7A4701EVM-094
> 3.5µVRMS (10Hz, 100KHz)
> <25 nV/√Hz (10Hz, 1MHz)
> Maximum Output Current of 1A
>
> +-15v version TPS7A30-49EVM-567:
> 15v rail:
> Noise:
>  12.7µVRMS (20Hz to 20kHz)
>  15.4µVRMS (10Hz to 100kHz)
> Power-Supply Ripple Rejection:
>  72dB (120Hz)
>  ≥ 52dB (10Hz to 400kHz)
> Maximum Output Current: 150mA
>
>
> -15v rail:
> Noise:
>  14µVRMS (20Hz to 20kHz)
>  15.1µVRMS (10Hz to 100kHz)
> Power-Supply Ripple Rejection:
>  72dB (120Hz)
>  ≥ 55dB (10Hz to 700kHz)
> Maximum Output Current: 200mA
>
> Ole
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-- 

Chris Albertson
Redondo Beach, California



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