Patent · US Active

Circuit and method for detecting a voltage change

US7859421B2 · kind B2 · utility

7Cited by

2References

25Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Joerg Berthold · Munich, DE
Christian Pacha · Birkenfeld, DE
Artur Wroblewski · Lüdenscheid, DE

Key dates

Filing date	Jan 28, 2009
Grant date	Dec 28, 2010
Priority date	—
Expiry date	Jun 25, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG01R19/16552
WIPO fieldMeasurement
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.