[time-nuts] Low noise power supplies for time nuts circuitry

Bob Camp lists at rtty.us
Tue Nov 22 13:10:00 EST 2011


Hi

With modern high frequency switchers, often a LC filter between the switcher and the LDO does the trick. The gotcha is that not all the energy is conducted. Radiated energy quickly becomes the issue….

Depending on what you are timing that may be more or less of an issue. 10 MHz distribution is one thing that really does not like the > 1 MHz stuff that the newer switchers put out. 

Bob


On Nov 22, 2011, at 12:44 PM, David VanHorn wrote:

> 
> In imaging systems, where the noise on the pixel supply was critical, I had good luck using a buck switcher followed by an LDO, whose maximum PSRR point determined the operating frequency of the switcher.  All normal techniques for removing SMPS noise still apply.
> 
> I used the ISL9000  http://www.intersil.com/products/deviceinfo.asp?pn=ISL9000  since it had the highest PSRR that I could find.
> 
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