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HSMP-389R Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED

Part # HSMP-389R
Description  Surface Mount RF PIN Switch Diodes
Download  13 Pages
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Manufacturer  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Direct Link  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

HSMP-389R Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED

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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
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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