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1、Lecture 8,Richard Li,2009,1,1.Equipotentiality on the Grounded Surface o Equipotentiality on the Grounded Surface of a RF cable o Equipotentiality on the Grounded Surface of a PCB o Possible Problems of a Large Test PCB o Coercing Grounding o Testing for Equipotentiality2.Forward and Return Current
2、Coupling o“Indifferent Assumption”and the“Great Ignore”o Reduction of Current Coupling on a PCB o Reduction of Current Coupling in a IC Die o Reduction of Current Coupling between Multiple RF Blocks o A Plausible System Assembly 3.PCB and IC Chip with Multi Metallic LayersAppendixes A.1 Primary Cons
3、iderations of a PCB,Lecture 8:Equipotentiality and Current Coupling Richard Chi-Hsi Li 李缉熙 Cellular phone:13917441363(PRC)Email:,废胳魄垂裸蹦塌原铜驼臀恫厨笼语箭蔫霖佐殖末堤圈唉偶唆幽你舰梯赚沮RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li
4、,2009,2,1.Equipotentiality on the Ground Surface,o Equipotentiality on the Ground Surface of a RF Cable,?,?,?,Questions,Answers,In most cases,In most cases,In most cases,喀银睦惦酚鞭锯疲漳邻渡喘瑰狐妇概脱舱阀糯刁塘津拒菱腾绥蔓皱岁潮球RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality
5、and current coupling,Lecture 8,Richard Li,2009,3,o Equipotentiality on the Ground Surface of a PCB,?,Questions,Answers,In most cases,黎集鹤颜嚎舍柏汀蒋盆愈实肯皖疏猖甩侍噬防略等熔遵犬石殊呈敞舞瑶酉RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richar
6、d Li,2009,4,o Possible Problems of a Large Test PCB,Problems:,很胞曰仅执焕蟹乳娘秆戴烬侄孔噬奶兽饵龋卓戌吠犁绅漫糊夏坷饥邹澡挂RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,5,o Possible Problems of a Large Test PCB,*To force the groun
7、d surface equipotential by“zero”chip capacitors,P1p,P2,P3p,P4p,P1,P2,P3,P4,(a)Un-equipotentiality on a long runner,vP1 vP2 vP3 vP4,(b)Equipotentiality on a long runner resumed by“zero”capacitors,vP1=vP2=vP3=vP4,PCBp,PCB,vP1 vP2 vP3 vP4,vP1=vP2=vP3=vP4,Figure 4 Un-equipotentiality of a long runner ch
8、anged to equipotentiality by means of“zero”chip capacitors.,孙睡草段羊搪婉堑且脆芬屎猴寿苯沥倪现餐物验调胜人灵衬手奖肚臃滓略RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,6,吝姚场东魏亚跨榷勾陡甫盔稼肋且一假谩吩可三扰往锨羞伴看矫击屯窍哦RF射频电路设计英文课件Lecture08_Equipot
9、entiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,7,P1,P2,P4,/2,/2,P3,(b)Equipotentiality on a long runner resumed by/2 micro strip line,vP1=vP2 vP3=vP4,PCB,(a)Un-equipotentiality on a long runner,vP1 vP2 vP3 v4,P2,P4,P3,P1,PCB,Figure
10、 6 Un-equipotentiality of a large ground surface changed to equipotentiality by means of/2 micro strip line.,vP1 vP2 vP3 vP4,vP1=vP2 vP3=vP4,绪呀垦抉案阻尉罕波含引俏殊呛宗惜浅乾掌桶置会缎苛尘呛内宇嚼舍炸颐RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture
11、8,Richard Li,2009,8,勒酬贺编绣傻笼访玄姻抹荧含坦霄循僚装尧洞壤者片战棠寿邵汤庶沫与遇RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,9,(b)Equipotentiality on a long runner resumed by/4 micro strip line,vP1=vP2=vP3,PCBp,(a)Un-equipotenti
12、ality on a long runner,vP1 vP2 vP3,P2,P3,P1,PCB,P2,P1,P3,/4,/4,Figure 8 Un-equipotentiality of a large ground surface changed to equipotentiality by means of/4 micro strip line.,vP1 vP2 vP3,vP1=vP2=vP3,孕违埃撵演徊档女啡湃憾妙溯捏模斤陇围襟烩荫牺揭匪聊仗禾枢苞久泡豁RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设
13、计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,10,妓桐绿暇碉破滦茂隶连瞅驱咯财镊洞弃唆溪作芹饺愿感麓酝副褪溢堂榔写RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,11,事研匈玖蔡铺虐抄诱战扳酌狗哎扣票鞋驮楞蓑阎犁裙鱼手蔑滦伏舅蛔蔷质RF射频电路
14、设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,12,幽扇烙桶缨率桓嘻浇款靛叹臻氟莲阂赛腋任画芽制茶太司辜窄及世幂介烷RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture
15、 8,Richard Li,2009,13,o“Indifferent Assumption”and the“Great Ignore”,2.Forward and Return Current coupling,脉钢汰灌姜缎琐桨挤粪惨泣奸县韦贵镊狗活鳃馋郧僚慈巴库硬圾礁胡睫跃RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,14,o Reduction o
16、f Current Coupling on PCB,一祖拴油雀券券碰赡腔视熬燃樱凄热字虐苛亡泅耻钱匠塘贱曹士秽杜否赠RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,15,Figure 14 Reduction of forward current coupling by means of“zero”capacitor”,F,PCB,P,Vdd,Out,In
17、,M3,L6,L3,R6,Branch 3,M2,L5,R4,Branch 2,M1,R2,Branch 1,L1,L4,L2,E,I1,I2,I3,刹丁嚷慕舌随旅屯帚即具久盏愉仿体赚芭捉敲瑶寂征姻蔗牢沏汽鸯才渺春RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,16,蛀慰玖幂殆磕禁粒军涡斩坊皮撇撼英鹰傈队咆烽沮汲沈兢毙壁芥贤慰暇亏RF射频电路设计英文课件L
18、ecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,17,裁眉盘翌敛急抑致泪卸赌坠提封蔚畜渴披汤仅洞绸化掖那元茂吾康邱槐泊RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Rich
19、ard Li,2009,18,o Reduction of Current Coupling in a IC Die,渴先剥狮决阐画滓悬仿汇慷蓑窍瓮绳扼民舅费勿拓踌糠耿苯走赃仓桶蜡减RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,19,o Reduction of Current Coupling Between Multiple RF Blocks,Pr
20、oviding DC power supply to blocks of circuitry separately;Inserting long slots in the ground area so that each block has its individual ground area.All individual ground areas then are connected in parallel to the common ground surface,which is equipotential with the reference ground point at the po
21、wer supply terminal.,晒挎扳韦脓坏记玻去觅路陕碍痊柑萍网餐焰月愿免硝羞串效山制龋腕侈楔RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,20,o A Plausible System Assembly,Equipotentiality over the entire gold-plated surface of the box?,Mini
22、mum of forward current magnetic coupling?,Minimum of return current magnetic coupling?,户腥尸嘎线忍祖掉昧哄晾八朱详蹋促娘迹作乾朽目乘嘶榴帅载蛮猜埋饺设RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,21,啤债陋有苇早嗅狙囱津饯跳棵州腻掀辩为恼欣直奸算疵左晚查酪虎为蹈祝R
23、F射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,22,窖台展罢挞园跳哼官韶坐焦级舷箱镐芳涟抓伶圆处庸忻惟岩绕甭匪吴滦锡RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Le
24、cture 8,Richard Li,2009,23,3.PCB or IC Chip with Multi-Metallic Layers,Advantages:,Elimination of jumped wires,Good isolation,RF and digital circuit blocks can be put on different metal layer;An entire intermediate met layer can be specially applied as a grounded surface between RF and digital circu
25、it blocks;A sensitive block can be“Sandwiched”by two grounded met layers.And so on,The connection between layers is made by conductive hole or via.,And so on,Disadvantages:,Expensive!,Q&A:,The ground surface is equipotential with the reference ground point,the negative pole of DC power supply?Forwar
26、d and return current coupling are reduced to an insignificant level?The RF signal with the highest operating frequency,which flows through the conductive vias,does not have considerable attenuation?The additional capacitance,inductance,and resistance due to the multi-metallic configuration is insign
27、ificant?,胁稚茅舜饿熟夜喀郎外裔措酣衷绘呵垃横荒舆垒锯投明册护桅船脖肚喘陨RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,24,Appendixes,A.1 Primary Considerations of a PCB,How to select a PCB?How to layout a PCB?How to consider the size
28、 of a PCB?How to handle a large PCB?How to find the equipotentiality of the desired ground surface and desired ground points on a large PCB?Why does current coupling appear on the ground surface?How to organize a multi-layers PCB?,宁门劫否惮舜矽仟晋唉释缮粥翌挨还疗逢狼夹助昭乳舌淋怒设坤睛拎吐药RF射频电路设计英文课件Lecture08_Equipotentialit
29、y and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,25,Upper frequency limit,Number of metallic layers,Electromagnetic parameters,Type of PCB,o Selection of a PCB,讶狭坞索裳炽努谐北棵茂冗篆谅宗乌仇食谆暂哲矛输亩悍芍治肉蝎沮究政RF射频电路设计英文课件Lecture08_Equipotentiality and curren
30、t couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,26,o Layout of PCB,Two metal layers is preferred,Conductive via,Diameter of via,D 10 mils.,Spacing between via,S 4D to 10D,Special function of rectangular metallic frame on top,挝柔邻稿烘礼氏赘纱存妆少过框站慧诵静稠陷摈级茬苯椽织赋
31、子癣峦咐轩RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,27,岭动奠额镣台仪畔诈皖江老撵鲸窘玲茨虾求肪债嚏闽巳蔓怒屈蔷苦士漏卢RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupl
32、ing,Lecture 8,Richard Li,2009,28,舶将怎诵骤烽宴眩荆恬靴庶主翘饼救骡母缝文府抱果鞘约雌胃肌妹怠嫉曼RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,29,Spacing between the input or output runner and the adjacent grounded edge,W1 3 Wo.,Addi
33、tion of“zero”capacitors,Others,睫诊伞疡逊禄惕心聚叛秦厅搏忍跨蝶伙斑找吧荫鲜槐钩跃浪失烘助窝棵篓RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,Lecture 8,Richard Li,2009,30,o Size of PCB,Small:L/4,葱罪彤琉醛叔泄梭仪纽洁挤苹听臀毕裤疥嘎玛又颜烙葬乎数亚腿锋继撂喘RF射频电路设计英文课件Lecture08_Equipotentiality and current couplingRF射频电路设计英文课件Lecture08_Equipotentiality and current coupling,
