时间间隔计数器的研制

樊战友王大琴李志刚王丹妮胡靖文(,,710600)介绍了一种新研制的时间间隔计数器,并给出了实验结果和误差的定性分析通过斜坡发生器高速采样保持A/D转换和器件时延平衡等电路的使用,该计数器在5MHz频标下可达到较高的测量精度和分辨率,该计数器亦可用于频率的精确测量TH7141,(Counter),[1],,,,,;,,,21,,,1T:T=Cn-1+t1-t2(1)2000-10-25,2000-12-14232CSAOPublications200121,Cn5MHz,t1,t25MHz,,Cn,200ns,200ns,,Cn,,(1)t1t2t1:,0~5V,,,A/D,10A/D,t1=2001023n1(ns)(2),n1A/D:t2=2001023n2(ns)(3),n2A/D,T:T=(Cn-1)200+n11023200-n21023200(ns)(4)T=20010231023(Cn-1)+n1-n2(ns)(5)32,Intel80C196/KC16[2],HSO.0,HS0.1AD781HS0.0,0V+5V,,,AD781(1),EXT0,10A/D,(4)n1117232:,(2),0V+5V,AD781(2)EXTl,A/D,(4)n2,HSO.02(1)(2)5%,,A/D,0.2%24,,3IOC0IOC1IOC2MASK0MASK1,A/D10,3us,10us,1EXT0EXT1(2061),,,,,11823EXT0EXT1EXT0,(1)t1,t2EXT1,t2,CnT,HSO.0,,,,,119232:3(a)(b)EXTO(c)EXT1(d)(e)5:(1),,PO2015,E3421,(2),GPS30,E3241,(10ns,E3241)(3)(),,,PO20,1202330,:1(m)(ns)0.512~181.613~194.517~268.827~38:(),,,(ECL),6(2),0.2(200/1023)ns0.2%(2000.2%=0.4ns),1ns,0.2ns,1ns,()()AD781500~700ns(),74HCO43~4.5ns,(,),,,,Lm119[3],,,,,在计数器的研制过程中,吕彩田张竹恒两位同志提供了参考资料,王宏远陈洪卿两位同志提出了宝贵意见,特此致谢参考文献[1]...1999,2[2].INTEL16.:,1995[3]LM119HighSpeedDualComparatorfrom(ShaanxiAstronomicalObservatory,TheChineseAcademyofSciences,Lintong,Shaanxi,710600)AbstractAnewlydevelopedintervaltimecounterisintroducedinthispaper.Adoptingtheslopegeneratorcircuit,thehighspeedsamplingandkeepingcircuit,theA/DconvertingcircuitandtheICdelaybalancecircuit,thecounterwith5MHz,frequencycanreachhigherprecisionandresolvingpowerinthemeasurements.Theexperimentresultandthequalitativeanalysesoner-rorsarepresentedinthispapertoo.Additionally,thecountercanalsobeusedtotheaccuratemeasuringforfrequency.KeywordsTimemeasuring;Counter12223