The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Spehro Pefhany"
Subject: Re: An interesting little prob.
References: <firstname.lastname@example.org> <email@example.com>
User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586))
Date: Wed, 30 Oct 2002 12:50:51 GMT
NNTP-Posting-Date: Wed, 30 Oct 2002 07:50:51 EST
The renowned Tony Williams wrote:
> Thinking aloud Speff. The stability of that closed-loop
> voltage regulator will almost certainly be load-dependant.
> eg, It will oscillate with (say) a big capacitive load.
Yes.. I do think so..
> Since this is primarily a precision current-source I can
> accept a less-than-perfect programmable voltage clamp
> in the interests of it being load-independant.
> In which case maybe a voltage-clamping output stage
> along the lines of below would be more suitable.
I like this a *lot* better. My ruminations over coffee
were going along the lines of trying to alter the
frequency response in line with the varying current
as well as isolating the (implied) load capacitance.
> + From const-I source
> "Vout" | \|/
> \ \ |
> \ / +--->Iout
> \ \ |
> \ | |
> F/B<--/\/\--------+ |
> _|_ _|_
> \_/<-- \_/ <-- Schottky pair in
> | | a TO-220 package
> | \ |/e
> | >-/\/\------------|pnp
> | / |\
Schottkys are very leaky, especially when warm, depending
on how long you can allow for the output Z to rise to
>1M this may or may not be an issue. With your 1V spec you
could use a nice fat silicon diode, of course.
"it's the network..." "The Journey is the reward"
firstname.lastname@example.org Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup