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Measurements >> RF Measurements >> Anyone knows how to test IIP3 of Complex Filters?
https://designers-guide.org/forum/YaBB.pl?num=1448438485

Message started by Rochester on Nov 25^th, 2015, 12:01am

Title: Anyone knows how to test IIP3 of Complex Filters?
Post by Rochester on Nov 25^th, 2015, 12:01am

I had designed a TT biquad complex Active-RC filter with 4 inputs and 4 outputs
The inputs are Iin+,Iin-,Qin+,Qin-; outputs are Iout-,Iout+,Qout-,Qout+
They consctruct complex singals by set the ac source with different phases.
I had measured the AC response and Image reject ratio.
But nothing I can do to measure IIP3 & SFDR
I had read the paper "Accurate and Rapid Measurement of IP2 and IP3" provided by website and some other documents like cadence spectre documents.
The documents provided detail simulation method in LNA & Mixert,But in complex filter I don't know how to deal with two signal route and four ports.