A CMOS inverter with a Schmitt-trigger input is not suitable for use in the oscillator circuit
described previously. A Schmitt-trigger input device has two different thresholds, and it may
not be possible to bias them properly in the linear region using the circuit described
previously.
An unbuffered inverter itself may not have enough drive for a high-capacitive load. As a
result, the output voltage swing may not be rail to rail. This also will slow down the edge rate
of the output signal. To solve these problems, a buffer or inverter with a Schmitt-trigger input
can be used at the output of the oscillator. Examples of Schmitt-trigger input buffers and
inverters are the LVC1G17 and LVC1G14.
SN74LVC3G04是buffered反向器，目前判断反向器没有工作在线性放大区，反向器型号有问题，希望得到大家的帮助，谢谢
