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square law mixer simulation (Read 2920 times)

mixed_signal Senior Member Offline Posts: 183	square law mixer simulation Apr 07^th, 2014, 8:12am Hi, I am simulating a square law mixer and the input to it is RF+LO. What is the best way to combine RF+LO? Use 2 ports and vcvs to add? But this screws matching since vcvs has high Rin and low Rout. If I put 50 ohm in parallel with port then I get incorrect NF? Put 2 ports in series? I want to simulate noise figure and matching.
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aaron_do Senior Fellow Offline Posts: 1398	Re: square law mixer simulation Reply #1 - Apr 7^th, 2014, 5:53pm How do you intend to do it in the real design? Transformer? If you just want some kind of ideal simulation, then you could use a PORT for the RF input, and put a voltage source in series for the LO. But in the final design, it sounds like your LO is going to affect your input matching... regards, Aaron
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mixed_signal Senior Member Offline Posts: 183	Re: square law mixer simulation Reply #2 - Apr 9^th, 2014, 8:08am Hi Aaron, I am using a cyclic combiner using L and C networks. If I use a voltage source then will spectreRF properly simulate large signal effects of LO since its not a port.
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mixed_signal Senior Member Offline Posts: 183	Re: square law mixer simulation Reply #3 - Apr 9^th, 2014, 8:31am Hi Aaron, I am using offchip transformer to generate LO+, LO-, RF+, RF- though and a cyclic combiner afterwards. I have posted a test setup question in RF measurements section. You may have a look.
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