Circuit and method for detecting a voltage change

Details Circuit and method for detecting a voltage change Circuit and method for detecting a voltage change

2009-01-28

2010-12-28

Mis, David (Department: 2817)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S660000, C331S046000, C331S057000, C331S064000, C331S173000

Reexamination Certificate

active

07859421

ABSTRACT:
A circuit arrangement for detecting voltage changes, comprising supply terminals configured to apply a first potential and a second potential, a first oscillator and a second oscillator, which are operated with the first potential and the second potential, a voltage dependence of the frequency of the first oscillator differing from a voltage dependence of the frequency of the second oscillator, a first evaluation circuit configured to evaluate the frequency of the first oscillator and a second evaluation circuit configured to evaluate the frequency of the second oscillator, and a comparison circuit configured to compare a value based on the evaluated frequencies of the first oscillator and of the second oscillator with a predetermined threshold value, and to output a voltage change signal indicating an impermissible voltage change between the first potential and the second potential depending on the result of the comparison.

REFERENCES:
patent: 3737754 (1973-06-01), Katz
patent: 7733189 (2010-06-01), Bennett
patent: 2213281 (1972-09-01), None

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