高速信号完整性

——2„„„„„„„3„PowerDistributionSystemPDS„Plane„Plane„PDS100÷×=PDSZ4„„5„„„I+-VN6„„XPSW=ESR+2πfESL„ESR——„ESL——7„)2ln(16.10DHXLPDS××=—inH—inD—innH„)1(9.31−××=NWHXLPDS—inH—inW—inN—nHHDHWN=281„PDS„„PDSPDS„„PDS„92„“”„“”PDS„„PDS„TTLECLPDS„10„„PDS„„„„„„„+=„“”„11A0.5mm0.1mm0.15mm0.1mm0.1mm0.5mm0.15mm0.15mm0.15mmXBYXYAXYB0.15mm0.1mm0.1mm1.0mm0.15mm121„/PCB20)/(11)(HDHIDi+××=πI0—AH—mD—mi(D)—A/in132„RfIAEL26.2×××=V/mA—cm2IL—Af—MHzR—m143„DW154„165„„3)ln(5WDDL=nH0/901022.2ZLTRL××=−290102/9010)()(−−+=TTTrRLCLTr××=4.30ZTLVVrcrosstalk××∆=2)(52.1rcrosstalkTLCVV××∆×=17„„bulk„„„„PCB„18„RF„19bulk„„5„„„/„„20„I„V„XMAX=V/I„LPSW„FPSW„Cbypass„LCFbypassPSWMAXPSWLXF××=π2MAXPSWbypassXFC×××=π21CMAXbypassLXF××=π221„5VCMOS10010pF5ns100nHAnsVpFtVNCI15510100=××=∆∆=∆VV100.0=∆Ω=∆∆=1.0IVXMAXnHLPSW100=KHzLXFPSWMAXPSW1592==πFXFCMAXPSWbypassµπ1021==LC=5nHMHzLXFCMAXbypass18.32==π22„+CLDCLPDSCbypass-„XPSW23„„24„Ltot„LC„N„CParallel„CelementππrMAXkneeMAXtotTXFXL=××=2totCLLN=MAXbypassparallelXFC×××=π21NCCparallelelement=25„5VCMOS10010pF5ns100nHLC=5nHnsTr5=Ω=1.0MAXXnHTXLrMAXtot159.0=×=πMHzFbypass18.3=FXFCMAXbypassparallelµπ5.021=×××=32==totCLLNFNCCparallelelementµ016.0==26„„NP0„X7R„Z5U„X7R„NP0Z5U„Z5U„NP0ESR„NP027„„„28PCB„PCB“”„drdACrplane××=ε225.0A—in2d—inr—pFFR-4r=4.5)d=0.01inCplane=100pF/in229C=0.225xAxrdAPowerDielectricGrounddr=90C=5nf/in2301-Comp2-Signal3-Power4-Ground5-Signal6-WireCORECORECapCORE6Layer/3CoreConstruction31PDS32„„„„331„——GroundBounceGB„GBL1L2L3ICLRLPCBPCB342„GB353„GB„„„„„„„