| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a schmitt trigger circuit with stable hysteresis characteristics. <P>SOLUTION: A schmitt trigger circuit includes: an inverter IV1 in which PMOS transistors P1 and P2 and NMOS transistors N1 and N2 are connected in series; a PMOS transistor P3 connected in parallel to the PMOS transistor P1; an NMOS transistor N3 connected in parallel to the NMOS transistor N1; an inverter IV2 applying a signal D in which an output signal Z is inverted to gate terminals of the PMOS transistor P3 and the NMOS transistor N3; a high-threshold logic circuit 1 applying a signal B in which an input signal A is inverted to gate terminals of the PMOS transistor P1 and the NMOS transistor N2; and a low-threshold logic circuit 2 applying a signal C in which the input signal A is inverted to gate terminals of the NMOS transistor N1 and the PMOS transistor P2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
