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https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> SP analysis for ideal_balun in analogLib and balun in rfLib https://designers-guide.org/forum/YaBB.pl?num=1447702773 Message started by john_ana on Nov 16th, 2015, 11:39am |
Title: SP analysis for ideal_balun in analogLib and balun in rfLib Post by john_ana on Nov 16th, 2015, 11:39am There are couple of baluns in the cadence libraries: ideal_balun in analogLib, balun in rfLib, etc. For balun in rfLib, we can specify the input and output impedance, while the ideal_balun we can not set any parameters. I did a test for these components, a 50 ohm port is driving (ac coupled) the differential side of the balun while the single-ended side of the balun is loaded to another 50 ohm port to ground. Simulation results show that the S11 and S22 depends on the input and output impedance we set for the balun. And ideal_balun results roughly matches the case where we set the input and output impedance to 50 ohm. It seems the trajectory of the ideal_balun is a bit longer. In addition, if I plot real and imag part of Z11 and Z22, I got noise like output, to the number of T ohms. Please help me understand these results. P-) |
Title: Re: SP analysis for ideal_balun in analogLib and balun in rfLib Post by john_ana on Nov 16th, 2015, 11:39am Simulation results are |
Title: Re: SP analysis for ideal_balun in analogLib and balun in rfLib Post by john_ana on Nov 16th, 2015, 11:40am real(z11) plots |
Title: Re: SP analysis for ideal_balun in analogLib and balun in rfLib Post by john_ana on Nov 18th, 2015, 2:55pm This is the setup of the bench |
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