pancho_hideboo
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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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