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PCB走线中途容性负载反射

时间:2016-11-23      浏览次数:

很多时候,PCB走线中途会经过过孔、测试点焊盘、短的stub线等,都存在寄生电容,必然对信号造成影响。走线中途的电容对信号的影响要从发射端和接受端两个方面分析,对起点和终点都有影响。

778专业棋牌测评网SHOUXIANANKANYIXIADUIXINHAOFASHEDUANDEYINGXIANG。DANGYIGEKUAISUSHANGSHENGDEJIEYUEXINHAODAODADIANRONGSHI,DIANRONGKUAISUCHONGDIAN,CHONGDIANDIANLIUHEXINHAODIANYASHANGSHENGKUAIMANYOUGUAN,CHONGDIANDIANLIUGONGSHIWEI:I=C*dV/dt。DIANRONGLIANGYUEDA,CHONGDIANDIANLIUYUEDA,XINHAOSHANGSHENGSHIJIANYUEKUAI,dtYUEXIAO,TONGYANGSHICHONGDIANDIANLIUYUEDA。

WOMENZHIDAO,XINHAODEFANSHEYUXINHAOGANSHOUDAODEZUKANGBIANHUAYOUGUAN,YINCIWEILEFENXI,WOMENKANYIXIA,DIANRONGYINQIDEZUKANGBIANHUA。ZAIDIANRONGKAISHICHONGDIANDECHUQI,ZUKANGBIAOSHIWEI:

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778专业棋牌测评网ZHEILIdVSHIJISHANGSHIJIEYUEXINHAODIANYABIANHUA,dtWEIXINHAOSHANGSHENGSHIJIAN,DIANRONGZUKANGGONGSHIBIANWEI:

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778专业棋牌测评网DUIYUJIESHOUDUAN,XINHAODAODAJIESHOUDUANHOU,FASHENGZHENGFANSHE,FANSHEHUILAIDEXINHAODAODADIANRONGWEIZHI,NEIGEYANGFASHENGFUFANSHE,FANSHEHUIJIESHOUDUANDEFUFANSHEDIANYATONGYANGSHIJIESHOUDUANXINHAOCHANSHENGXIACHONG。

为了使反射噪声小于电压摆幅的5%(这种情况对信号影响可以容忍),阻抗变化必须小于10%。那么电容阻抗应该控制在多少?电容的阻抗表现为一个并联阻抗,我们可以用并联阻抗公式和反射系数公式来确定它的范围。对于这种并联阻抗,我们希望电容阻抗越大越好。假设电容阻抗是PCB走线特性阻抗的k倍,根据并联阻抗公式得到电容处信号感受到的阻抗为:

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ZUKANGBIANHUALVWEI:

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,JI

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YEJIUSHISHUO,GENJUZHEIZHONGLIXIANGDEJISUAN,DIANRONGDEZUKANGZHISHAOYAOSHIPCBTEXINGZUKANGDE9BEIYISHANG。SHIJISHANG,SUIZHEDIANRONGDECHONGDIAN,DIANRONGDEZUKANGBUDUANZENGJIA,BINGBUSHIYIZHIBAOCHIZUIDIZUKANG,LINGWAI,MEIYIGEQIJIANHAIHUIYOUJISHENGDIANGAN,SHIZUKANGZENGJIA。YINCIZHEIGE9BEIXIANZHIKEYIFANGKUAN。ZAIXIABIANDETAOLUNZHONGJIASHEZHEIGEXIANZHISHI5BEI。

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DECHU:

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JIZAIZHEIZHONGQINGKUANGXIA,RUGUOXINHAOSHANGSHENGSHIJIANWEI1ns,NEIMEDIANRONGLIANGYAOXIAOYU4PIFA。FANZHI,RUGUODIANRONGLIANGWEI4PIFA,ZEXINHAOSHANGSHENGSHIJIANZUIKUAIWEI1ns,RUGUOXINHAOSHANGSHENGSHIJIANWEI0.5ns,ZHEIGE4PIFADEDIANRONGJIUHUICHANSHENGWENTI。

ZHEILIDEJISUANZHIBUGUOSHIWEILESHUOMINGDIANRONGDEYINGXIANG,SHIJIDIANLUZHONGQINGKUANGSHIFENFUZA,XUYAOKAOLVDEYINSUGENGDUO,YINCIZHEILIJISUANSHIFOUJINGQUEMEIYOUSHIJIYIYI。GUANJIANSHIYAOTONGGUOZHEIZHONGJISUANLIJIEDIANRONGSHIRUHEYINGXIANGXINHAODE。WOMENDUIDIANLUBANSHANGMEIYIGEYINSUDEYINGXIANGDOUYOUYIGEGANXINGRENSHIHOU,JIUNENGWEISHEJITIGONGBIYAODEZHIDAO,CHUXIANWENTIJIUZHIDAORUHEQUFENXI。JINGQUEDEPINGGUXUYAOYONGRUANJIANLAIFANGZHEN。

ZONGJIE:

1 PCB走线中途容性负载778专业棋牌测评网使发射端信号产生下冲,接收端信号也会产生下冲。

2 NENGRONGRENDEDIANRONGLIANGHEXINHAOSHANGSHENGSHIJIANYOUGUAN,XINHAOSHANGSHENGSHIJIANYUEKUAI,NENGRONGRENDEDIANRONGLIANGYUEXIAO。

BENZHANJISHUWENZHANGHUANYINGZHUANZAI,ZHUANZAIQINGZHUMINGCHUCHU:  

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