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通常双晶体管斯米特电路有一缺点,即较难计算滞后或开关电平。图1所设计的电路能较容易地预先计算出它的转换电平,并具有较宽的滞后能力。
One common drawback with two-transistor Schmitt circuits is that it is harder to calculate hysteresis or switching levels. The circuit designed in Figure 1 can be easily pre-calculated for its switching levels and has a wide hysteresis.