[time-nuts] Low noise power supplies for time nuts circuitry
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Tue Nov 22 18:12:06 UTC 2011
Omitting the output bypass cap in the single transistor Wenzel
cancellation circuit is somewhat misleading in that it reduces the high
frequency attenuation,
All his other circuits include such caps.
A simple tweak (adjusting a resistor ratio) which makes the shunt
transistor collector current approximately PTAT significantly reduces
the temperature dependence of the cancellation.
Bruce
Bob Camp wrote:
> Hi
>
> Interesting site - Thanks!
>
> A couple of observations:
>
> There are a couple of circuits (low noise op-amp based) that can generate lower noise than what he's shown.
>
> You need to be careful looking at his results. A lot of what he shows is the result of changing the model used for the output capacitor….
>
> Still well worth looking at.
>
> Bob
>
>
> On Nov 22, 2011, at 7:07 AM, Ulrich Bangert wrote:
>
>
>> Gentlemen,
>>
>> i would like to draw your attention to this site:
>>
>> http://pstca.com/spice/ripple/ripple.htm
>>
>> The author of this site thank-worthy not only presents circuits for power supply finesse but also simulates them with SPICE. It seems to turn out as if the well known Wenzel suggestions for voltage regulator finesse were not state of the art and other circuits (although similar in principle) may easily outperform them.
>>
>> Best regards
>>
>> Ulrich Bangert
>> Ortholzer Weg1
>> 27243 Gross Ippener
>> Deutschland
>> Tel +49 (0)4224 95071
>> Fax +49 (0)4224 95072
>> Mob +49 (0)172 8006546
>> www.ulrich-bangert.de
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
More information about the time-nuts
mailing list