ShellAlbert / Summary2019

record the reading books in 2019
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propagation delay tpd (maximum frequency) #20

Open ShellAlbert opened 5 years ago

ShellAlbert commented 5 years ago

QQ截图20190328093717 QQ截图20190328095116 QQ截图20190328095345

ShellAlbert commented 5 years ago

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ShellAlbert commented 5 years ago

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ShellAlbert commented 5 years ago

无标题 无标题1 施密特触发器,输入大于3.4V时认为高,输入小于1.89V时认为低, 而时钟激励源, 正弦波Vp-p=3.3V,DC offset=0V时,这样3.3V/2=1.65V,这样正幅值最大为1.65V,负幅值最大为-1.65V,均不能满足要求。 故需要加直流偏置,将波形抬到0V以上,DC offset=1.65V, 这样正弦波以1.65V为中间上下摆动,最大正摆幅接近于3.3V,最大负摆幅接近于0V。

定制的正弦波晶振时,必须要求输出摆幅有直流偏置,且是电源电压的一半。

ShellAlbert commented 5 years ago

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ShellAlbert commented 5 years ago

无标题

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ShellAlbert commented 5 years ago

sfdsafa