Circuit to calculate square root of voltage?

[Mike Monett]

Jim Thompson wrote:

[...]

What weed were those guys smoking ?

...Jim Thompson

Perhaps they never had to fix an autorouted board

Although it should be possible add more checking to the software to
prevent those errors. For example, don't connect the collector to the
emitter

Mike Monett

 

[Spehro Pefhany]

Jim Thompson wrote:

[...]

What weed were those guys smoking ?

...Jim Thompson

Perhaps they never had to fix an autorouted board

Although it should be possible add more checking to the software to
prevent those errors. For example, don't connect the collector to the
emitter

Mike Monett

Humans have vestigial components too.


Best regards,
Spehro Pefhany

 

[John Popelish]

Jim Thompson wrote:

Perhaps they never had to fix an autorouted board

Although it should be possible add more checking to the software to
prevent those errors. For example, don't connect the collector to the
emitter

In genetic design, any connection that is possible and not expressly
forbidden (the forbidden cases, in this case probably involve
excessive currents) are allowed. The apparently pointless parts and
connections often provide the tricks that make the circuit do
something useful but not obvious to a goal oriented observer.

 

[Nicholas O. Lindan]

Nice. Also QPC19, Q77, Q184 and Q258.

A square root circuit design by genetic algorithm.

Packed with vestigial organs and junk DNA.
Apart from all that, it works rather well.
Darwin rules. Well, God rules, Darwin interprets.

 

[Winfield Hill]

Nicholas O. Lindan wrote...

Mike Monett wrote

A square root circuit design by genetic algorithm.

Packed with vestigial organs and junk DNA.
Apart from all that, it works rather well.
Darwin rules. Well, God rules, Darwin interprets.

Works well? It has 0.1% accuracy over three input decades,
with 10% supply-voltage and 50C temperature effects < 0.1%?
Works over the usual production variations in BJT parms, and
doesn't require a certain beta value or leakage current, etc.?

 

[Mike Monett]

Spehro Pefhany wrote:

[...]

Humans have vestigial components too.
Best regards,
Spehro Pefhany

Not if I designed 'em. Everyone would have exactly the right number of
parts, correctly proportioned to work in perfect harmony, like this:

http://www3.sympatico.ca/add.automation/misc/perfect.jpg

Not that I'd expect any thanks or recognition. You ungrateful wretches
would probably do away with Santa if you had a chance:

http://www3.sympatico.ca/add.automation/misc/santa.jpg

(Images courtesy of J.Thompson, I think

Mike Monett