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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Antispam question: What do MOONwalk and MOONdance have in common? Answer: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON [quote][i]Originally posted by Rain[/i] [br]Hi, I tried to simulate a PCB printed inductor, i made a C program to generate a parametric one This is an inductor with 10 turn, W = 0.4mm S= 0.4mm and 35um of track height .unit MM .default nwinc=8 nhinc=1 sigma=5.8e4 N1 x= 0.0000 y= 0.0000 z= 0.0000 N2 x= 1.6000 y= 0.0000 z= 0.0000 N3 x= 1.6000 y= -2.4000 z= 0.0000 N4 x= -0.8000 y= -2.4000 z= 0.0000 N5 x= -0.8000 y= 0.8000 z= 0.0000 N6 x= 2.4000 y= 0.8000 z= 0.0000 N7 x= 2.4000 y= -3.2000 z= 0.0000 N8 x= -1.6000 y= -3.2000 z= 0.0000 N9 x= -1.6000 y= 1.6000 z= 0.0000 N10 x= 3.2000 y= 1.6000 z= 0.0000 N11 x= 3.2000 y= -4.0000 z= 0.0000 N12 x= -2.4000 y= -4.0000 z= 0.0000 N13 x= -2.4000 y= 2.4000 z= 0.0000 N14 x= 4.0000 y= 2.4000 z= 0.0000 N15 x= 4.0000 y= -4.8000 z= 0.0000 N16 x= -3.2000 y= -4.8000 z= 0.0000 N17 x= -3.2000 y= 3.2000 z= 0.0000 N18 x= 4.8000 y= 3.2000 z= 0.0000 N19 x= 4.8000 y= -5.6000 z= 0.0000 N20 x= -4.0000 y= -5.6000 z= 0.0000 N21 x= -4.0000 y= 4.0000 z= 0.0000 N22 x= 5.6000 y= 4.0000 z= 0.0000 N23 x= 5.6000 y= -6.4000 z= 0.0000 N24 x= -4.8000 y= -6.4000 z= 0.0000 N25 x= -4.8000 y= 4.8000 z= 0.0000 N26 x= 6.4000 y= 4.8000 z= 0.0000 N27 x= 6.4000 y= -7.2000 z= 0.0000 N28 x= -5.6000 y= -7.2000 z= 0.0000 N29 x= -5.6000 y= 5.6000 z= 0.0000 N30 x= 7.2000 y= 5.6000 z= 0.0000 N31 x= 7.2000 y= -8.0000 z= 0.0000 N32 x= -6.4000 y= -8.0000 z= 0.0000 N33 x= -6.4000 y= 6.4000 z= 0.0000 N34 x= 8.0000 y= 6.4000 z= 0.0000 N35 x= 8.0000 y= -8.8000 z= 0.0000 N36 x= -7.2000 y= -8.8000 z= 0.0000 N37 x= -7.2000 y= 7.2000 z= 0.0000 N38 x= 8.8000 y= 7.2000 z= 0.0000 N39 x= 8.8000 y= -9.6000 z= 0.0000 N40 x= -8.0000 y= -9.6000 z= 0.0000 N41 x= -8.0000 y= 8.0000 z= 0.0000 E1 N1 N2 w= 0.400000 h= 0.035 E2 N2 N3 w= 0.400000 h= 0.035 E3 N3 N4 w= 0.400000 h= 0.035 E4 N4 N5 w= 0.400000 h= 0.035 E5 N5 N6 w= 0.400000 h= 0.035 E6 N6 N7 w= 0.400000 h= 0.035 E7 N7 N8 w= 0.400000 h= 0.035 E8 N8 N9 w= 0.400000 h= 0.035 E9 N9 N10 w= 0.400000 h= 0.035 E10 N10 N11 w= 0.400000 h= 0.035 E11 N11 N12 w= 0.400000 h= 0.035 E12 N12 N13 w= 0.400000 h= 0.035 E13 N13 N14 w= 0.400000 h= 0.035 E14 N14 N15 w= 0.400000 h= 0.035 E15 N15 N16 w= 0.400000 h= 0.035 E16 N16 N17 w= 0.400000 h= 0.035 E17 N17 N18 w= 0.400000 h= 0.035 E18 N18 N19 w= 0.400000 h= 0.035 E19 N19 N20 w= 0.400000 h= 0.035 E20 N20 N21 w= 0.400000 h= 0.035 E21 N21 N22 w= 0.400000 h= 0.035 E22 N22 N23 w= 0.400000 h= 0.035 E23 N23 N24 w= 0.400000 h= 0.035 E24 N24 N25 w= 0.400000 h= 0.035 E25 N25 N26 w= 0.400000 h= 0.035 E26 N26 N27 w= 0.400000 h= 0.035 E27 N27 N28 w= 0.400000 h= 0.035 E28 N28 N29 w= 0.400000 h= 0.035 E29 N29 N30 w= 0.400000 h= 0.035 E30 N30 N31 w= 0.400000 h= 0.035 E31 N31 N32 w= 0.400000 h= 0.035 E32 N32 N33 w= 0.400000 h= 0.035 E33 N33 N34 w= 0.400000 h= 0.035 E34 N34 N35 w= 0.400000 h= 0.035 E35 N35 N36 w= 0.400000 h= 0.035 E36 N36 N37 w= 0.400000 h= 0.035 E37 N37 N38 w= 0.400000 h= 0.035 E38 N38 N39 w= 0.400000 h= 0.035 E39 N39 N40 w= 0.400000 h= 0.035 E40 N40 N41 w= 0.400000 h= 0.035 .external N1 N41 .freq fmin=1e4 fmax=1e8 ndec=1 .end The software return in output: 0.710135+0.000900107j at 10KHz which yeld to about 710mOHM of series resistence and 900uH of inductance The inductance of this coil given by the approximation is on the order of 780nH and 400mOHM The ESR is OK, but the inductance is 3 order of magnitude off, am i interpreting the data in a wrong way? Is my spiral ill described? Thanks [/quote]   Check here to include your profile signature.