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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> Y-parameters in SpectreRF https://designers-guide.org/forum/YaBB.pl?num=1225399560 Message started by Paul on Oct 30th, 2008, 1:46pm |
Title: Y-parameters in SpectreRF Post by Paul on Oct 30th, 2008, 1:46pm Hi, It happens I have Y-parameters for a component. I wondered if I can directly use the component as is with SpectreRF or if I have to convert them to S-parameters? Are y-parameters supported in simulation and if yes, how do I tell SpectreRF that these are Y-params and not S-params? Thanks Paul |
Title: Re: Y-parameters in SpectreRF Post by didac on Nov 1st, 2008, 5:59am Hi, If my memory isn't failing the nport component supports TOUCHSTONE file format, the first line of that text file has the following description: # <frequency unit> <parameter> <format> R <n> in parameter you can specify what kind of data you are introducing(S,Y,Z,H,G). Hope it helps, |
Title: Re: Y-parameters in SpectreRF Post by Paul on Nov 11th, 2008, 12:15pm Thanks for the input, Didac. It seems there was an issue with the reference impedance definition in the Touchstone file. Regards Paul |
Title: Re: Y-parameters in SpectreRF Post by pancho_hideboo on Nov 19th, 2008, 9:36pm I don't check Cadence Spectre. But Cadence Spectre should treat Y/Z parameter same as Agilent ADS. Agilent ADS treats Y/Z parameter in Touchstone and Citi file like followings. (1) Y/Z parameter in Touchstone “test_touchstone1.y2p” ! Touchstone for Two-port Y-parameter Data in a single line format # GHZ Y RI R 50 1.0 11 0 21 0 12 0 22 0 Y/Z parameter in touchstone format are assumed to be normalized by reference resistnace R0. So actual Yij will be (1/R0)*yij, here R0=Reference Resistance, yij is normalized admittance parameter. The actual Y- (Z-) parameter value is obtained by dividing (multiplying) the file entry with the reference resistance. For example, actual Y11 will be (1/50)*y11=(1/50)*11=0.22, etc… (2) Y/Z parameter in Citi file “test_y2p.citi” CITIFILE A.01.00 NAME SP1.SP VAR freq MAG 1 DATA Y[1,1] RI DATA Y[1,2] RI DATA Y[2,1] RI DATA Y[2,2] RI DATA PortZ[1] RI DATA PortZ[2] RI VAR_LIST_BEGIN 4e9 VAR_LIST_END BEGIN 11, 0 END BEGIN 12, 0 END BEGIN 21, 0 END BEGIN 22, 0 END BEGIN 100, 0 END BEGIN 200, 0 END Y/Z parameter in Citi File format file are assumed to be unnormalized. |
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