Patent ID: 6340907
Filing Date: 2002-01-22
Classification: H03K

Abstract:
A Schmitt trigger circuit comprising:a first inverting amplifier circuit comprising a first p-channel transistor, with a source connected to a power supply potential side, having a first set threshold voltage level and a first load n-channel transistor with a source connected to a ground potential side, wherein the first p-channel transistor in its drain is connected to the first load n-channel transistor in its drain and an input signal is supplied and connected to a gate in the first p-channel transistor while a first input signal level decision signal is output from the first p-channel transistor on its drain side; a second inverting amplifier circuit comprising a second n-channel transistor, with a source connected to the ground potential side, having a second set threshold voltage level and a second load p-channel transistor with a source connected to a power supply potential side, wherein the second n-channel transistor in its drain is connected to the second load p-channel transistor in its drain and said input signal is supplied and connected to a gate in the second n-channel. transistor while a second input signal level decision signal is output from the second n-channel transistor on its drain side; and a flip-flop circuit into which the first input signal level decision signal is input as one input while the second input signal level decision signal is input as another input, an output from the flip-flop circuit being used as an output signal, an inverted signal of the second input signal level decision signal being supplied and connected to the first load n-channel transistor at its gate, an inverted signal of the first input signal level decision signal being supplied and connected to the second load p-channel transistor at its gate.