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逻辑器件的输入阻抗我们可以通过Vcc/Ileakage 计算得到。
比如25度的时候，CD40106B的input current 为100nA 在18V的时候，那么常温下输入阻抗大约为180Mohm。
事实上，CMOS输入的输入阻抗都比较高。
Maximum Input Current Of 1 µA at 18 V Over Full
Package Temperature Range:
– 100 nA at 18 V and 25°C
