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Circulators, Scatterometers, etc, etc...

P

Peter O. Brackett

Jan 1, 1970
0
A different look at transmission waves, circulators, isolators, gyrators,
scatterometers, and stuff...

See recent PowerPoint presentation entitled "Waves: The Scatterometer and
Other Interesting Circuits" posted in both MS ppt and Adobe pdf formats on
USENET a.b.s.e a couple of days ago.
 
J

Jens Tingleff

Jan 1, 1970
0
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A different look at transmission waves, circulators, isolators, gyrators,
scatterometers, and stuff...

See recent PowerPoint presentation entitled "Waves: The Scatterometer and
Other Interesting Circuits" posted in both MS ppt and Adobe pdf formats on
USENET a.b.s.e a couple of days ago.

Discrete componnets! How quaint...

;-) ;-) ;-)

Posted chip-photo and response of 5th order low-pass filter to a.b.s.e as
follow-up. The filter is the lower half of the chip (the upper half is more
of the same at a higher frequency).

I use explicit current for A/B variables and implement the 1st order LP/HP
functions directly in Gm-C blocks, avoiding lossless integration
everywhere.

The reflections (HP response) zeros are not perfect because of (very!)
finite DC gain of the Gm blocks; the response is taken for the Q-tuning
point where the forward (LP) is flat. The difference in flat levels of the
two responses is - again - a function of the finite DC gain. The Qu is
tuned by varying the Gm values in the 1st order sections (a neat trick,
even if I do say so myself).

I'm still annoyed I never got to build a filter using a circulator to
realise an all-pass which in turn is the response I use to emulate Lattice
sections :-(

Best Regards

JEns
- --
Key ID 0x09723C12, [email protected]/[email protected]
Analogue filtering / 5GHz RLAN / Mdk Linux / odds and ends
http://www.imaginet.fr/~jensting/ +44 1223 211 585
"We'll get jobs and pay the rent, we'll get credit cards and be happy"
Hartley
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