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layout the elliptic gm-C filter (Read 1926 times)
edward.yin
New Member
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Posts: 3
CHN
layout the elliptic gm-C filter
Aug 08
th
, 2007, 1:53am
hi,all
after I finished the schematic of a elliptic Gm-C filter, what requirement should I take into account when I layout the filter, is there anyone who can give me some advice about that?
thx in advance!
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ACWWong
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Posts: 539
Oxford, UK
Re: layout the elliptic gm-C filter
Reply #1 -
Aug 9
th
, 2007, 8:00am
For an elliptic gmC filter where pole Q is normally quite high you will be more prone to layout parasitics fouling up your reponse/gain. So pay attention to parasitic R (short tracks not too narrow, ensure good via coverage where needed) as well as C (use higher level metals) and an post layout extracted simulation is a must to check the performance.
Also be aware non-schematic items like antenna diodes which may not be extracted from the layout.
I guess its differential so of course pay attention to symmetry. Anyway try the excellent book by Alan Hastings "The Art of Analog Layout".
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