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HSMP-3892 Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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HSMP-3892 Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED |
7 / 13 page 7 Equivalent Circuit Model HSMP-389x Chip* Typical Applications for HSMP-489x Low Inductance Series Microstrip Series Connection for HSMP-489x Series In order to take full advantage of the low inductance oftheHSMP-489xserieswhenusingtheminseriesap- plications,bothlead1andlead2shouldbeconnected together,asshowninFigure17. Co-Planar Waveguide Shunt Connection for HSMP-489x Series Co-Planar waveguide, with ground on the top side of the printed circuit board, is shown in Figure 20. Since iteliminatestheneedforviaholestoground,itoffers lowershuntparasiticinductanceandhighermaximum attenuationwhencomparedtoamicrostripcircuit. ASPICEmodelisnotavailableforPINdiodesasSPICE doesnotprovideforakeyPINdiodecharacteristic,car- rierlifetime. 1 2 3 Figure 16. Internal Connections. HSMP-489x Figure 17. Circuit Layout. 50 OHM MICROSTRIP LINES PAD CONNECTED TO GROUND BY TWO VIA HOLES Figure 18. Circuit Layout. 0.3 nH 0.3 nH 0.3 pF 1.5 nH 1.5 nH Figure 19. Equivalent Circuit. Figure 20. Circuit Layout. Co-Planar Waveguide Groundplane Center Conductor Groundplane 0.12 pF* * Measured at -20 V 0.5 Ω Rj Rs Cj Rj = 20 Ω I0.9 RT = 0.5 + Rj CT = CP + Cj I = Forward Bias Current in mA * See AN1124 for package models Figure 21. Equivalent Circuit. 0.3 pF 0.75 nH Figure 16. Internal Connections. Figure 17. Circuit Layout. Microstrip Shunt Connections for HSMP-489x Series InFigure18,thecenterconductorofthemicrostripline isinterruptedandleads1and2oftheHSMP-489xdiode areplacedacrosstheresultinggap.Thisforcesthe1.5 nHleadinductanceofleads1and2toappearaspartof alowpassfilter,reducingtheshuntparasiticinductance andincreasingthemaximumavailableattenuation.The 0.3nHofshuntinductanceexternaltothediodeiscre- atedbytheviaholes,andisagoodestimatefor0.032" thickmaterial. Figure 18. Circuit Layout. Figure 19. Equivalent Circuit. Figure 20. Circuit Layout. Figure 21. Equivalent Circuit. |
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