[time-nuts] Low noise powersupplies

Edesio Costa e Silva time-nuts at tardis.net.br
Fri Aug 8 07:36:34 EDT 2014


An application note
(http://cds.linear.com/docs/en/application-note/an124f.pdf) from Jim
Williams and the related video (https://www.youtube.com/watch?v=Ta1ZuZTHYXA)
may be informative.

Edésio

On Thu, Aug 07, 2014 at 01:41:32PM -0700, Chris Albertson wrote:
> 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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