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balanced system OIP3 calculation

Question asked by santanu_roy on Jul 15, 2014

I want to use Spectrasys to calcuate the system based cascaded OIP3 for a balanced system with a 90 deg hyrbid at the input and a 90 degree hybrid at the output. I did this with two amplifiers with exactly the same parameters. The OIP3 should be the individual amplifier OIP3 + 3dB ( assuming low losss hybrids ) but I get actially Amp OIP3 - 3dB although when I measure channel power I get the correct signal cancellation at the isolated ports.

See System3 design / analysis / table attached file.


Santanu Roy