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https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> Mixer IIP2 simulation problem https://designers-guide.org/forum/YaBB.pl?num=1171387492 Message started by Prabhu on Feb 13th, 2007, 9:24am |
Title: Mixer IIP2 simulation problem Post by Prabhu on Feb 13th, 2007, 9:24am I am trying to estimate the IIP2 of a double balanced gilbert cell mixer. To model the transconductor mismatches I am using dc voltage offsets at one of the gates. I have also introduced mismatch in the load resistor. I did a sweep QPSS analysis with two equal tones (f1 = 2.45 GHz, f2 = 2.455 GHz ) and LO = 2.443 GHz When I plot the IP2 curves the slope of the f2 - f1 component is close to 3 instead of 2. But when I plot the single ended output current of the mixer at f2 - f1 it shows the proper second order behaviour ( slope = 2 ). Once I take differntial output the slope becomes close to 3. What could be the reason for this strange behaviour? thanks Raja Prabhu |
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