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Use of the CMOS Unbuffered Inverter in Oscillator Circuits https://www.ti.com/lit/an/szza043/szza043.pdf
Understanding Schmitt Triggers https://www.ti.com/lit/an/scea046/scea046.pdf
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原文地址：https://www.cnblogs.com/dongshenscut/p/12894089.html
