Circuit for producing a reset signal

Details Circuit for producing a reset signal Circuit for producing a reset signal

1998-08-10

2000-07-11

Zweizig, Jeffrey

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 63, 327 68, 327 70, H03L 700

Patent

active

060878665

ABSTRACT:
A circuit for producing a reset signal includes a voltage divider at which a first voltage proportional to a supply voltage can be tapped off. A resistor and a Zener diode disposed in the reverse direction are connected between the supply voltage and ground in a series circuit at which a second voltage can be tapped off. A difference signal between the first and second voltages is supplied to a first bistable multivibrator. An output signal from the first multivibrator is supplied to a low-pass filter configuration. A difference signal between an output signal from the low-pass filter configuration and the second voltage is supplied to a second bistable multivibrator. The multivibrators each exhibit hysteresis. A reset signal can be tapped off at the second multivibrator.

REFERENCES:
patent: 4260907 (1981-04-01), Winebarger
patent: 4309627 (1982-01-01), Tabata
patent: 4727270 (1988-02-01), Payne
patent: 5214316 (1993-05-01), Nagai
patent: 5592112 (1997-01-01), Nishibe
patent: 5629642 (1997-05-01), Yoshimura
Malcolm, "Fundamentals of Electronics", Breton Publishers, Massachusetts, pp. 91-92, 1987.
Japanese Patent Abstract No. 07095019A (Hiroshi), dated Apr. 7, 1995.
"Halbleiter-Schaltungstechnik", Ulrich Tietze et al., 7.sup.th edition. 1985, Chapter 21.1.1, pp. 637-639.

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