Patent ID: 7292021
Filing Date: 2007-11-06
Classification: G01C

Abstract:
1. An anomaly detector for detecting a DC component of an oscillator signal, comprising: a DC component detector that detects a DC component of said oscillation signal, said detector including no timing delay element that introduces a delay in detecting said DC component, said a DC component detector producing, from said oscillation signal, a pair of first and second signals having amplitudes of opposite polarities so that at least one of said first and second signals contains said DC component of the signal, and combining said first and second signals to detect said DC component by mutually canceling said amplitudes of opposite polarities, wherein said DC component detector includes: a window comparator, associated with said DC component detector, that determines whether the detected DC component is within a predetermined range, wherein said window comparator has an upper threshold value defining the upper limit of said predetermined range and a lower threshold value defining the lower limit of said predetermined range, and said window comparator defines a midpoint value between said upper and lower threshold values corresponding to twice the value of said DC component that is generated when said DC component is of a normal value.