Reset circuit

Details Reset circuit Reset circuit

2007-10-02

2007-10-02

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

C327S142000

Reexamination Certificate

active

11012712

ABSTRACT:
A reset circuit includes a power supply supplying a power supply voltage, and a band-gap reference that generates a voltage reference signal. A resistor start-up circuit is responsive to the voltage reference signal, and further responsive to an increase in the power supply voltage. The resistor start-up circuit generates a first current when the power supply voltage increases to a first predetermined voltage, and further generates a second current when the power supply voltage increases to a second predetermined voltage. When the second current generated by the resistor start-up circuit is supplied to a resistor divider, the resistor diver delivers an output voltage that is a predetermined portion of the power supply voltage. A comparator compares the voltage reference signal with the resistor divider output voltage, and generates a reset signal when the resistor divider output voltage equals the voltage reference signal.

REFERENCES:
patent: 5619164 (1997-04-01), Tomishima
patent: 5631599 (1997-05-01), Bacrania et al.
patent: 6342781 (2002-01-01), Laraia
“STM809, STM810, STM811, STM812: Reset Circuit”, Feb. 2004. pp. 1-18. Accessible online at <http://www.st.com/stonline/books/pdf/docs/9873.pdf>.

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