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<html><head><title>饮水思源精华区</title><Content-type: text/html; charset=gb2312><link rel=stylesheet type=text/css href="bbsdl.css"></head><table cellspacing=0 class=title width=90%><th class=title align=left width=20%>饮水思源站</th><th class=title align=center width=60%>文章阅读</th><th class=title align=right width=20%>精华区离线浏览</th></tr></table><hr><table align=center cellspacing=1 class=doc><tr><td>发信人:&nbsp;fangf&nbsp;(方方),&nbsp;信区:&nbsp;DSP<br>标&nbsp;&nbsp;题:&nbsp;&nbsp;高&nbsp;分&nbsp;辩&nbsp;率A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;应&nbsp;用&nbsp;考&nbsp;虑(-)<br>发信站:&nbsp;饮水思源站&nbsp;(Sat&nbsp;Jun&nbsp;&nbsp;5&nbsp;10:20:52&nbsp;1999)&nbsp;,&nbsp;站内信件<br><br>----&nbsp;在&nbsp;板&nbsp;级、&nbsp;芯&nbsp;片&nbsp;级&nbsp;或&nbsp;系&nbsp;统&nbsp;级&nbsp;中&nbsp;如&nbsp;果&nbsp;不&nbsp;求&nbsp;助&nbsp;于A/D&nbsp;变&nbsp;换&nbsp;器，&nbsp;不&nbsp;<br>管&nbsp;数&nbsp;字&nbsp;信&nbsp;号&nbsp;处&nbsp;理（DSP）&nbsp;采&nbsp;用&nbsp;多&nbsp;先&nbsp;进&nbsp;的&nbsp;技&nbsp;术，&nbsp;也&nbsp;会&nbsp;是&nbsp;聋&nbsp;的、&nbsp;哑&nbsp;<br>的&nbsp;和&nbsp;瞎&nbsp;的。&nbsp;没&nbsp;有&nbsp;精&nbsp;度，&nbsp;即&nbsp;使&nbsp;是&nbsp;最&nbsp;快&nbsp;的A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;也&nbsp;终&nbsp;归&nbsp;是&nbsp;一&nbsp;<br>匹&nbsp;三&nbsp;条&nbsp;腿&nbsp;的&nbsp;赛&nbsp;马，&nbsp;是&nbsp;不&nbsp;健&nbsp;全&nbsp;的。&nbsp;<br><br>----&nbsp;目&nbsp;前&nbsp;的A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;分&nbsp;辩&nbsp;率&nbsp;范&nbsp;围8&nbsp;～24&nbsp;位。&nbsp;<br><br>----&nbsp;高&nbsp;速&nbsp;与&nbsp;高&nbsp;分&nbsp;辩&nbsp;率&nbsp;<br><br>----&nbsp;当&nbsp;闪&nbsp;速&nbsp;变&nbsp;换&nbsp;器&nbsp;仍&nbsp;在&nbsp;追&nbsp;求&nbsp;速&nbsp;度&nbsp;时，&nbsp;其&nbsp;分&nbsp;辩&nbsp;率&nbsp;对&nbsp;于&nbsp;精&nbsp;密&nbsp;仪&nbsp;<br>器&nbsp;应&nbsp;用&nbsp;来&nbsp;说&nbsp;是&nbsp;太&nbsp;低&nbsp;了。Harris&nbsp;Semiconductor&nbsp;公&nbsp;司&nbsp;的&nbsp;最&nbsp;快A/D&nbsp;变&nbsp;换&nbsp;<br>器HI1276&nbsp;是&nbsp;一&nbsp;款500MSPS&nbsp;器&nbsp;件，&nbsp;但&nbsp;其&nbsp;精&nbsp;度&nbsp;只&nbsp;有8&nbsp;位，&nbsp;所&nbsp;以&nbsp;正&nbsp;好&nbsp;用&nbsp;于&nbsp;<br>雷&nbsp;达&nbsp;和&nbsp;低&nbsp;分&nbsp;辩&nbsp;率&nbsp;数&nbsp;字&nbsp;示&nbsp;波&nbsp;器，&nbsp;但&nbsp;不&nbsp;适&nbsp;用&nbsp;于&nbsp;像&nbsp;血&nbsp;液&nbsp;分&nbsp;析&nbsp;仪&nbsp;这&nbsp;<br>样&nbsp;的&nbsp;医&nbsp;学&nbsp;仪&nbsp;器。&nbsp;<br><br>----&nbsp;高&nbsp;精&nbsp;度A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;从18&nbsp;位&nbsp;分&nbsp;辩&nbsp;率&nbsp;开&nbsp;始，&nbsp;并&nbsp;可&nbsp;达24&nbsp;位。&nbsp;对&nbsp;于&nbsp;<br>像&nbsp;血&nbsp;液&nbsp;分&nbsp;析&nbsp;和&nbsp;声&nbsp;纳&nbsp;这&nbsp;样&nbsp;的&nbsp;应&nbsp;用，&nbsp;采&nbsp;用&nbsp;没&nbsp;有&nbsp;竞&nbsp;争&nbsp;对&nbsp;手&nbsp;的&nbsp;∑&nbsp;Δ&nbsp;<br>技&nbsp;术。&nbsp;这&nbsp;些&nbsp;器&nbsp;件&nbsp;分&nbsp;辩&nbsp;率&nbsp;为18&nbsp;～24&nbsp;位。&nbsp;在&nbsp;理&nbsp;论&nbsp;上，&nbsp;当&nbsp;用&nbsp;来&nbsp;数&nbsp;字&nbsp;<br>化2V&nbsp;范&nbsp;围&nbsp;的&nbsp;信&nbsp;号&nbsp;时，24&nbsp;位&nbsp;器&nbsp;件&nbsp;具&nbsp;有120nV&nbsp;的&nbsp;最&nbsp;低&nbsp;有&nbsp;效&nbsp;位&nbsp;值。&nbsp;<br><br><br>----&nbsp;如Burr-Brown&nbsp;公&nbsp;司&nbsp;的A/D&nbsp;变&nbsp;换&nbsp;器ADS1211&nbsp;可&nbsp;产&nbsp;生24&nbsp;位&nbsp;分&nbsp;辩&nbsp;率&nbsp;并&nbsp;<br>以100Hz&nbsp;输&nbsp;出&nbsp;率&nbsp;进&nbsp;行&nbsp;取&nbsp;样。&nbsp;当&nbsp;输&nbsp;出&nbsp;率&nbsp;增&nbsp;加&nbsp;到1kHz&nbsp;时&nbsp;它&nbsp;在&nbsp;相&nbsp;同&nbsp;<br>的2V&nbsp;量&nbsp;程&nbsp;内&nbsp;分&nbsp;辩&nbsp;率&nbsp;只&nbsp;有20&nbsp;位。&nbsp;这&nbsp;些&nbsp;∑&nbsp;Δ&nbsp;变&nbsp;换&nbsp;器&nbsp;通&nbsp;过&nbsp;调&nbsp;节&nbsp;到&nbsp;过&nbsp;<br>取&nbsp;样&nbsp;率&nbsp;和&nbsp;输&nbsp;出&nbsp;滤&nbsp;波&nbsp;器&nbsp;带&nbsp;宽，&nbsp;以&nbsp;牺&nbsp;牲&nbsp;变&nbsp;换&nbsp;速&nbsp;率&nbsp;来&nbsp;换&nbsp;取&nbsp;分&nbsp;辩&nbsp;<br>率。&nbsp;<br>--<br>-----------------------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;因一个词的力量<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我重新开始生活<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我生来就认识你<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;要把你称作<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;自由<br><br>※&nbsp;来源:·饮水思源站&nbsp;bbs.sjtu.edu.cn·[FROM:&nbsp;202.120.8.11]<br></tr></table><br><caption align=bottom><hr><table align=center cellspacing=1 class=foot><tr><td class=foot><a href="a-3.htm">返回</tr></table><p class=copyr align=center>Copyright &copy; 2001 <a class=copyr href="http://bbs.sjtu.edu.cn">SJTUBBS</a>, All Rights Reserved.<br><br>版权所有<a class=copyr href="telnet://bbs.sjtu.edu.cn">上海交大BBS饮水思源站</a></caption></body></html>
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