[time-nuts] Low noise powersupplies

[bruce at ko4bb.com]

I have a couple of these. however their noise spectral density tends
 to rise precipitously below 1Hz or so. There  are regulators with significantly
lower flicker noise.

Bruce


> On August 7, 2014 at 6:35 AM Tom Van Baak <tvb at LeapSecond.com> wrote:
>
>
> Ole,
>
> Thanks for bringing it to our attention.
> For those that like to click instead of search:
>
> http://www.ti.com/tool/TPS7A4701EVM-094
> http://www.ti.com/lit/ug/slvu741a/slvu741a.pdf
> http://www.ti.com/product/tps7a4701
> http://www.ti.com/lit/ds/symlink/tps7a4701.pdf
>
> /tvb
>
> ----- Original Message -----
> From: "Ole Petter Ronningen" <olepr01 at gmail.com>
> To: <time-nuts at febo.com>
> Sent: Wednesday, August 06, 2014 11:38 PM
> Subject: [time-nuts] Low noise powersupplies
>
>
> > 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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