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信号完整性和印制电路板一书的第三章中,讲到电容的时候,有如下的叙述:
Another way to think about this is to recognize how many electrons actually flow during a half-cycle of an AC current. A 1-MHz waveform changes direction 106 times each second. Therefore, for the same magnitude of peak current (charge/unit time), only one-millionth (10–6) as many electrons flow during the half-cycle of a 1-MHz (106) waveform as flow during the half-cycle of a 1-Hz waveform. Therefore, the voltage buildup on a capacitor will be substantially less for a half-waveform of a 1-MHz signal than for a 1-Hz signal. [url=mkMSITStore:G:\ebook\circuit\信号完整性和印制电路板设计\[D.Brooks]6_Signal.Integrity.Issues.And.Printed.Circuit.Board.Design.chm::/013141884X_ch03lev1sec4.html#ch03table01]Table 3-1[/url] summarizes the range of possibilities.
Table 3-1. Capacitor size and frequency both affect the flow of current.[img=401,111]mkMSITStore:G:\ebook\circuit\信号完整性和印制电路板设计\[D.Brooks]6_Signal.Integrity.Issues.And.Printed.Circuit.Board.Design.chm::/FILES/45fig01.gif[/img]
中文如下: [img=925,311]file:///C:/DOCUME~1/THINKP~1/LOCALS~1/Temp/42$AS%7DA03]P)U[TYRG@D8G7.jpg[/img] |
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