These transmission line models accurately simulate frequency-dependent
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Transmission Line Model
These transmission line models accurately simulate frequency-dependent behavior Coilcraft surface mount "Spring" core inductors within frequency limits shown accompanying table each individual inductor. They based de-embedded measurements using 2-port network analyzer. model schematic, shown below, combines ideal transmission line model with lumped elements. Each model should analyzed only whole input output ports. Conclusions based individual lumped element values erroneous. individual element values listed table each individual spring inductor.
Calibration plane
Mini Springs
Table Test
Size Size Size Width (inch 0.060 1,524 0.120 3,048
Brass ground plane
Figure Test Setup
Ohm) wide traces tinned gold over thick alumina, were included gap. TRL* calibration plane also illustrated Figure lumped element values were determined matching simulation model average measurements. This method results model that represents closely possible typical frequency-dependent behavior component within specified frequency limits model. lumped element models were used generate 2-port S-parameters therefore give identical results with same number simulation frequency points. S-parameters available site
Effects different circuit board traces, board materials, ground planes interactions with other components included. They will have significant effect when comparing simulation measurements individual inductors using other production verification instruments fixtures. Typically, Self-Resonant Frequency (SRF) inductor model will higher than measurement component mounted circuit board. parasitic reactive elements circuit board fixture will effectively lower circuit resonant frequency, especially very small inductance values. Data sheet specifications based typical production measurements. These models based de-embedded 2-port measurements described below, model results different from data sheet specifications.
Disclaimer
Coilcraft makes every attempt provide accurate measurement data software, representative components, usable format. Coilcraft, however, disclaims warrants relating data software, whether expressed implied, including without limitation implied warranties merchantability fitness particular purpose. Coilcraft cannot will liable special, incidental, consequential, indirect similar damages occurring with data and/ software.
Lumped Element Modeling Method
measurements were made over brass ground plane with each component centered over gap, illustrated Figure width each size component given Table test pads were
Specifications subject change without notice.
Document 343-1 Revised 05/21/03
Document
Transmission Line Model Coilcraft Mini SpringsPart number Frequency limit Model (MHz) Lower Upper (pF) (degrees) (MHz)
A01T_ A02T_ A03T_ A04T_ A05T_ B06T_ B07T_ B08T_ B09T_ B10T_
14000 9000 5500 4500 3500 4000 3500 2500 2500 2300
11.13 11.55 6.809 7.084 5.363 14.85 16.69 26.68 22.30 17.51
0.0150 0.0320 0.0513 0.0807 0.1202 0.1508 0.1778 0.2304 0.2802 0.3509
0.0904 0.1114 0.1508 0.2621 0.2456 0.1234 0.1329 0.1247 0.1390 0.1866
94.13 116.7 144.2 182.9 213.8 182.5 203.6 225.3 254.5 269.3
33.44 34.19 39.01 38.39 39.56 40.64 44.14 48.11 50.75 49.99
3505 2218 1957 1572 1279 1184 1143 1082 1021
Specifications subject change without notice.
Document 343-2 Revised 05/21/03
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