[time-nuts] Low noise power supply

J. Forster jfor at quik.com
Tue Mar 8 23:27:02 UTC 2011


This is not a "low noise" PS, IMO. There is far too much ripple on the
outputs for that.

Furthermore, I'd bet it has real radiated EMI issues.

-John

=============


> At 16:41 -0500 08-03-2011, EWKehren at aol.com wrote:
>>There is an interesting article in the March 2011 Electronic Products
>>magazine "design an ultra low noise supply for analog circuits. It is a
>>combination of switcher and LDO's and written by P Hunter TI so it
>>may also  be available on their site.
>
> This one, I presume:
> <http://www2.electronicproducts.com/Designing_an_ultra_low_noise_supply_for_analog_circuits-article-fapo_TI_mar2011-html.aspx>
> ? Bit of a shame to use LDOs and then still drop 50% of the output
> voltage. Also, Fig 2 is meaningless without a measurement bandwidth
> spec.
>
> There are other ways to get a cleaner bipolar supply from a switcher,
> several of them simpler than what's shown here. You could take a
> SEPIC/Cuk hybrid, or pick a switcher that allows you to trade
> efficiency for switch slew rate like the LT1533. Some useful
> techniques are documented in <http://www.linear.com/docs/4159>.
>
> JDB.
> [not affiliated with Linear Tech other than being a satisfied customer]
> --
> Years from now, if you are doing something quick and dirty,
> you imagine that I am looking over your shoulder and say to
> yourself, "Dijkstra would not like this," well that would be
> immortality for me.          -- Edsger Dijkstra, 1930 - 2002
>
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