Version 4 SHEET 1 1888 1724 WIRE 240 432 240 400 WIRE 240 544 240 512 WIRE 240 832 240 800 WIRE 240 944 240 912 WIRE 256 48 256 16 WIRE 256 160 256 128 WIRE 384 400 240 400 WIRE 384 800 240 800 WIRE 432 16 256 16 WIRE 448 544 448 432 WIRE 448 944 448 832 WIRE 640 16 496 16 WIRE 640 64 640 16 WIRE 640 160 640 128 WIRE 640 400 512 400 WIRE 640 448 640 400 WIRE 640 544 640 512 WIRE 640 800 512 800 WIRE 640 848 640 800 WIRE 640 944 640 912 WIRE 736 16 640 16 WIRE 736 400 640 400 WIRE 736 800 640 800 FLAG 640 544 0 FLAG 240 544 0 FLAG 736 400 out_s2p FLAG 640 160 0 FLAG 256 160 0 FLAG 736 16 out_lib FLAG 448 544 0 FLAG 640 944 0 FLAG 240 944 0 FLAG 736 800 out_s2px FLAG 448 944 0 SYMBOL polcap 624 448 R0 WINDOW 3 24 64 Left 0 SYMATTR Value 0.68µ SYMATTR InstName C1 SYMATTR Description Capacitor SYMATTR Type cap SYMATTR SpiceLine V=50 Irms=28m Rser=3.7 MTBF=2000 Lser=5n ppPkg=1 SYMBOL voltage 240 416 R0 WINDOW 123 26 160 Left 0 WINDOW 39 24 132 Left 0 SYMATTR Value2 AC 1 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V1 SYMATTR Value 0 SYMBOL polcap 624 64 R0 WINDOW 3 24 64 Left 0 SYMATTR Value 0.68µ SYMATTR InstName C2 SYMATTR Description Capacitor SYMATTR Type cap SYMATTR SpiceLine V=50 Irms=28m Rser=3.7 MTBF=2000 Lser=5n ppPkg=1 SYMBOL voltage 256 32 R0 WINDOW 123 26 160 Left 0 WINDOW 39 24 132 Left 0 SYMATTR Value2 AC 1 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL FerriteBead 464 16 R90 WINDOW 0 -16 0 VBottom 0 SYMATTR InstName L1 SYMATTR Value 232n SYMATTR SpiceLine Ipk=3 Rser=0.03 Rpar=77 Cpar=62f mfg="Wurth Elektronik eiSos" pn="742 792 312" SYMBOL S2PORT 448 400 R0 SYMATTR Value 742792312 SYMATTR InstName U2 SYMBOL polcap 624 848 R0 WINDOW 3 24 64 Left 0 SYMATTR Value 0.68µ SYMATTR InstName C3 SYMATTR Description Capacitor SYMATTR Type cap SYMATTR SpiceLine V=50 Irms=28m Rser=3.7 MTBF=2000 Lser=5n ppPkg=1 SYMBOL voltage 240 816 R0 WINDOW 123 26 160 Left 0 WINDOW 39 24 132 Left 0 SYMATTR Value2 AC 1 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V3 SYMATTR Value 0 SYMBOL S2PORT 448 800 R0 SYMATTR Value 742792312x SYMATTR InstName U1 TEXT 232 -152 Left 0 !.include 742792312.lib TEXT 238 -122 Left 0 !.ac oct 50 10 2G TEXT 232 288 Left 0 ;This model comes from the s parameter file taken from the Wurth web site (742792312.s2p). TEXT 232 -56 Left 0 ;This model comes from the intrenal LTSpice library (RLC model) TEXT 232 -184 Left 0 !.include 742792312x.lib TEXT 216 664 Left 0 ;This model comes from the s parameter file taken from the Wurth web site (742792312.s2p)\nI have it enhanced with linear interpolated data values @100kHz and 10kHz. TEXT 408 56 Left 0 ;742 792 312\nWuerth TEXT 696 96 Left 0 ;Ls=4nH TEXT 696 472 Left 0 ;Ls=4nH TEXT 696 872 Left 0 ;Ls=4nH TEXT 232 -760 Left 0 ;This example shows that it's really necessary to extrapolate S-parameter \ndata to lower frequencies if the AC-simulation starts at a lower frequency.\nHelmut Sennewald\nThe bead models from Wuerth are 2-port models.\n \nNever forget that every component has a lead inductance which has \na great effect in the higher frequency range. I have added Ls=4nH in \nthe capacitors.\n \nThe new s2p-file named 74279312x.s2p is an extended version of \nthe original file 74279312.s2p. The first two data lines are extrapolated \nfrom the original first 1MHz measurement point.\n# MHz S MA R 50\n0.01 0.00015 89.98 1.000 -0.008 1.000 -0.008 0.00015 89.98 \n0.1 0.0015 89.8 1.000 -0.0835 1.000 -0.0835 0.0015 89.8\n1.000000 0.015 88.081 1.000 -0.835 1.000 -0.835 0.015 88.081\n \nBtw, it doesn't make sense to use the S-paramters here, because\nthe RLC bead model fits already so well the S-parameter data.