2000 S-parameters reported Johanson Technology's MLCSoft® softwar
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SIMULATING EFFECT MOUNTING S-PARAMETERS HIGH FREQUENCY MULTI-LAYER CEARMIC CAPACITORS
2000
S-parameters reported Johanson Technology's MLCSoft® software analytically measured then mathematically de-embedded represent capacitor alone. deembedding done because test fixture used during measurements accurately reflect actual in-circuit mounting situations. This de-embedded data used starting point then modified using techniques described this note yield S-parameters which represent specific in-circuit mounting situation more accurately. actual measurement made series mounting configuration with microstrip environment where width microstrip line identical close width capacitor. This microstrip environment alumina substrate (used during TRL* calibration, also launching to/from DUT), except directly under where substrate air. After de-embedding, physical length capacitor under test very small capacitances from capacitor body ground included measured Sparameters. Reported data including these effects desirable because these effects will present when capacitor mounted actual circuit. During measurement fixture, capacitor de-embedded terminations, causing capacitor's physical length included phase opposed mathematically de-embedded S-parameters presented MLCSoft®.) method mounting capacitor final circuit application alter discontinuity impedance cause reported S-parameters differ significantly from those created particular application. Some variables effecting S-parameters include mounting configuration (series shunt), transmission line width, substrate (PCB) dielectric constant solder fillet geometry/quality. high frequencies, capacitor, it's mounting, material, etc. make "network" that defines SRF. Therefore capacitor itself meaningful definition. example, Series Resonant Frequency (SRF) increases approximately indicated magnitude dip) when material changed from FR-4 Alumina (capacitor mounted series configuration.) Mounting shunt configuration (SRF dip) could decrease about from that measured when series configuration. have found that these effects closely simulated microwave program (such ADS, Eagleware, Compact) using S-parameters given MLCSoft®, then adding values Lext, Dly1 shown Figure below.
dly1
Capacitor represented MLCSoft® v1.2
Lext
Figure
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represent capacitance varies with dielectric constant material used. Lext represents reduced that occurs when shunt mounting. Dly1 represents delay caused mechanical length capacitor (MLCSoft data presented deembedded center capacitor.) Four common mounting scenarios were examined: Mounting #1.) Series Mounted over MLCSoft® (for comparison) Mounting #2.) Series Mounting 0.025" Thick FR-4 with opposing ground plane Mounting #3.) Series Mounting 0.025" Thick Alumina with opposing ground plane Mounting #4.) Shunt Mounting 0.025" Thick Alumina with opposing ground plane determined values Lext Dly1 following method. First, actual Sparameter measurements were made capacitors mounted configurations outlined above. Next, downloaded S-parameters from MLCSoft® into microwave simulation software. Then varied Lext Dly1 simulator until Sparameters displayed were close possible measured values obtained first step. values obtained follows: Mounting #1.): Lext: (all 0.00); {Add delay shown below} Mounting #2.): C1~0.03pF, C2~0.03pF, Lext=0.0nH (Modeled series mode CAD) Mounting #3.): C1~0.07pF, C2~0.07pF, Lext=0.0nH (Modeled series mode CAD) Mounting #4.): C1~0.07pF, C2~0.07pF, Lext=0.5nH (Modeled shunt mode CAD) 0402 Size: Dly1~ 0403 Size: Dly1~ 0504 Size: Dly1~ 0603 Size: Dly1~ 0805 Size: Dly1~ 1210 Size: Dly1~ (applies mounting situations shown above) (applies mounting situations shown above) (applies mounting situations shown above) (applies mounting situations shown above) (applies mounting situations shown above) (applies mounting situations shown above)
values will affect (S11) (S21) will unaffected when series mounted configuration. values will affect (S11) (S21) will unaffected when shunt mounted configuration. future update MLCSoft® that will include S-parameters common mountings using simulation techniques described above under development.
NOTE: Johanson Technology makes warranty kind with regard MLCSoft® software package, design methods discussed this note. In-circuit device performance subject many variables that evident simulations. shall liable errors contained software this application note, incidental consequential damages connection with furnishing, performance, software methods contained this application note
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