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
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