Increment/Decrement Control Loops

[Jim Thompson]

Anyone know the history of Increment/Decrement Control loops?

There's a paragraph on page 56 of the October "Microwaves and RF"
magazine about AGCing a VCO using an up/down counter and D-A in an
increment/decrement control... touting it as if it's the next best
thing to sliced bread.

But I hardly think it's novel... I was setting the timing of
automobile ignition systems in 1968, but used a squirt of charge
into/out-of a capacitor to increment/decrement.

The paragraph references an IEEE article in October's "IEEE
Transactions on Instrumentation and Measurement", which I can't access
since I object to $35/month for the privilege (as I noted today as I
renewed my memberships).

Maybe someone who subscribes to that service can look it up?

Thanks!

...Jim Thompson
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[Spehro Pefhany]

On Mon, 01 Nov 2004 08:37:57 -0700, the renowned Jim Thompson
<thegreatone@example.com> wrote:

I thought it worked rather well. My scheme looked at dwell, decided
if it was early or late and moved a threshold accordingly... this
happened _after_ firing so was not subject to noise from the spark.

Just like having an elf sitting there turning a knob just a small
amount after each firing ;-)

...Jim Thompson

I think it generally works better if the elf moves the knob more for
large differences and less for small differences.


Best regards,
Spehro Pefhany
--
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