Lecture07_Grounding使用说明简介
42页1、1. Implications of Grounding 2. Possible Problems Hidden in a Schematic3. Imperfect or Inappropriate Grounding Examples oInappropriateSelectionofBypassCapacitor*UnderestimationorIgnoringofBypassCapacitor*BlindSelectionofBypassCapacitoroImperfectGrounding*The“LongMarch”*Un-EquipotentialityonaGroundedSurface oImproperConnection*ConnectionfromTestedPCBtoDCPowerSupply*ConnectionfromGroundtoGround 4. “Zero” CapacitoroWhatis“Zero”capacitor? ”oSelectionofthe“Zero”CapacitoroBandwidthofthe“Zero”Capacitor
2、oCombinedEffectofMultiple“Zero”CapacitorsoChipInductorisaGoodAssistanto“Zero”CapacitorinRFICDesign Lecture 7 : Grounding Richard Chi-Hsi Li李缉熙Cellularphone:13917441363(PRC)Email:5. Quarter Wavelength of Micro Strip Line oARunnerisaPartinRFCircuitryoWhytheQuarterWavelengthissoImportant?oTheMagicoftheOpen-circuitedQuarterWavelengthMicroStripLineoTestingforWidthofaMicroStripLinewithSpecificCharacteristicImpedanceoTestingfortheQuarterWavelength Appendix o CharacterizingaChipCapacitorandChipInductorb
3、yMeansofS21Testing Lecture#71RichardLi,2009 1. Implications of Grounding Fully grounding points : G1, G2, G3, G4, G5, G6, G7, G8 Half grounding points : Vcc1, Vcc2, Vcc3, Vcc4, Vcc5, Vcc6, Vcc7, Vcc8 Reference grounding pointFigure 1 A typical way to draw a schematic of circuitryInOutQ3R5R4R3VccQ1R2R1Q4L7R7R6L1L2G2G4G6G8G1G3G5G7Vcc1Vcc2Vcc3Vcc4Vcc5Vcc6Vcc7Vcc8GNDBlock ABlock BLecture#72RichardLi,2009 o Grounding Problems Hidden in a Schematic How to ensure all the fully grounded points being AC
4、and DC equipotential with the reference ground point or terminal? How to ensure all the half grounded points being AC but not DC short-circuited to the reference ground point or terminal? Furthermore, if the conditions of equipotentiality, are not satisfied, the problem of forward current and return current coupling will appear. VccFigure 2 Forward and return current added to the schematic as shown in Figure 1Forward currentReturn currentGNDOutQ3R5R4R3Q1R2R1Q4L7R7R6L1L2G2G4G6G8G1G3G5G7Vcc1Vcc2Vc
5、c3Vcc4Vcc5Vcc6Vcc7Vcc8Block ABlock BLecture#73RichardLi,20093. Imperfect or Inappropriate Grounding Exampleso Inappropriate Selection of Bypass Capacitor* Underestimation or Ignoring of Bypass Capacitor* Blind Selection of Bypass capacitor“Bypass capacitor = 0.01 F !?”“Selection of Bypass is based on performance of the block !” A huge crowded capacitorsFigure 3a A huge crowd of capacitors are supposed to function as bypass capacitorsInOutQ3R5R4R3DC power supplyQ1R2R1Q4L7R7R6L1L2G2G4G6G8G1G3G5G7V
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