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阻抗控制計算目的:學會使用Polarsi9000對特殊信號線的阻抗計算舉例:1.差分信號線的阻抗計算以E03為例,E03USB2.0D+,D-要求有90歐姆的阻抗匹配,依照此要求,計算出這兩條差分信號線在走線時的線寬和線間距.計算需準備的數據;板層的迭構方式,各個板層之間的介質厚度,介質常數,銅箔厚度,阻抗控制的設計阻值.板層的迭構方式thicknessErUNIT:MILSOLDER0.8444.2TOP1.0OZ1.4PP84.2VCC1.0OZ1.4CORE64.2GND1.0OZ1.4PP84.2BOT1.0OZ1.4SOLDER0.8444.2此差分信號走線是在BOT層,與他相鄰的一層就是GND層,所以我們在計算時用到數據是BOT與GND之間的數據.安裝好計算工具後,打開Polarsi9000.依據下圖的設置來計算:2.G06的GPS傳輸線阻抗計算紅色走線部分需要做50OHM阻抗匹配板層結構thicknessErUNIT:MILSOLDER0.83.8L1(TOP)1.0OZ1.4PP211664.6L2(IN2)1.0OZ1.4CORE64.2L3(IN3)1.0OZ1.4PP211644L4(IN4GND)1.0OZ1.4Traceasshortaspossible.CM3100.01U/25V12CM3150.1U/10V12CM3133P/50V12CM3060.01U/25V12UM24BGSC3f/LP-7979N2N3N4N5N6N7N8N9N10P5P7M2M3M4M5M6M7M8M9M10L4L5L6L7L8L9P1H10J4J5K4K5B1K3P2P3P4P6P8P9P10L10B4GND_RFGND_RFGND_RFGND_RFGND_RFGND_RFGND_RFGND_RFGND_RFGND_RFGND_RFVCC_RFVCC_RFVCC_RFVCC_RFVCC_RFVCC_RFVCC_RFVCC_RFVCC_RFGND_RFGND_RFGND_RFGND_RFGND_RFGND_RFGRFRSTRESETCLKACQ_ISIGNMAG_ICLKACQ_OSIGNMAG_ORFPWRUPAGCPWMXTAL_IXTAL_OTP_IFRF_INVCC_IOEXTVCC_RTCRTC_XIRTC_XOVDD_RTCTPM1091TPM1081LM47GTH1608PD-56NJ21GSC3F_nRESETCM3141000P/50V12LM465N6/GTHP21ShieldedbyDGND1V5_RTCCM3090.01U/25V12CM31618P/50V12TPM1111LM441U/GNLE1610P12CM3080.01U/25V12CM31718P/50V122V8_RFDIG2V8_RFUM25SAW1G51234ING1OUTG2YM832K768/SSP-T6123CM3112P2/50V12CM3070.01U/25V12TPM1101RF_OUTLM453N6/GTHP212V8_RFCM31222P/50V12RM207180K+-1%12YM7TCXO16.369M12345NCGNDOUTVCCGNDCORE44L5(IN5VCC)1.0OZ1.4PP211644L6(IN6)1.0OZ1.4CORE64.2L7(IN7)1.0OZ1.4PP211664.6L8(BOT)1.0OZ1.4SOLDER0.83.8TOL:48.8在LAYOUT中實際走線為L1(TOP)層,其下對應的7層為GND即以L2層作為參考平面實際計算此傳輸線的線寬在計算工具中輸入參數F