Abstract
A Schmitt trigger circuit of the present invention comprises a first inverter for setting a positive trigger voltage corresponding to a threshold level when an input signal is changed in a direction from a low voltage level to a high voltage level, a second inverter for setting a negative trigger voltage corresponding to a threshold level when an input signal is changed in a direction from a high voltage level to a low voltage level. The Schmitt trigger circuit of the present invention further comprises a level shift circuit for shifting the input signal voltage level down by a constant voltage and supplying the voltage shifted input signal to the first inverter.
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