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From: "Christopher R. Carlen"
Subject: Re: How to increase PLL order?
Date: Wed, 11 Dec 2002 09:41:54 -0800
Organization: Sandia National Laboratories, Albuquerque, NM USA
References: <3DF51A99.954034FA@zarlink.com> <3DF74F69.94C06FF8@mmm.com.DELETETHIS>
NNTP-Posting-Date: Wed, 11 Dec 2002 16:40:09 +0000 (UTC)
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Roy McCammon wrote:
> the traditional trick is to make two of them go
> away (very high) by minor loop feedback. You
> use a small resistance (but big wattage) resister
> to pick off the motor current and close a loop
> around that and the power amp. This pushes to
> voltage to current pole out to high frequency.
> Next you put a tachometer on the motor to measure
> frequency and you use that to close a velocity loop.
> That moves the acceleration to velocity pole out
> to high frequency. Now you have a one pole system.
[edited lots of neat diagrams]
Ok, I'm sold. This was a great post, which I have filed and will study
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
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