JPS6473811A - Schmitt circuit - Google Patents

Abstract

PURPOSE:To realize a fast operation and low power consumption, by forming a BiCMOS circuit constituted by combining a bipolar transistor circuit and three sets of CMOS circuits and providing a hysteresis characteristic. CONSTITUTION:The said circuit is provided with a first CMOS circuit of P1 and N1, a second CMOS circuit of P3 and N3, a third CMOS circuit (P4 and N4), and the bipolar circuit (Q1 and Q2). The hysteresis characteristic is attached on the first CMOS circuit (P1 and N1) by varying apparent resistance values of a first resistor R1 and a third resistor R3, respectively, provided at the first CMOS circuit (P1 and N1) by the second CMOS circuit (P4 and N3) and the third third CMOS circuit. The low power consumpition is realized in those CMOS circuits (P1 and N1), (P3 and N3), and (P4 and N4), respectively. The output of the first CMOS circuit (P1 and N1) is outputted from the bipolar circuit (Q1 and Q2), and the fast operation is performed by applying large current driving on a load.