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4 小时
为什么晶振并联1MΩ电阻时,程序运行正常?没有1MΩ就会出问题?
换一种说法,假设电路中无任何的扰动信号,晶振不可能起振。实际上反相门电路中许多电路不加这个电阻也能起振,因为一般的电路都有扰动信号,但有个别的反相门电路不加这个电阻就不能起振,因为扰动信号强度不够。 需要指出的是,在低温环境下振荡电路阻抗也会发生变化 ...
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