Patent ID: 6316991
Filing Date: 2001-11-13
Classification: G01R,H03L

Abstract:
A voltage out-of-calibration detector for detecting drift in signal voltage comprising:a voltage divider operating between first and second voltage rails and having a plurality of taps for generating first and second comparison voltages;a first set of switches for selectively coupling at least one of said plurality of taps to an input of a first voltage comparator, said first voltage comparator for comparing said first comparison voltage with an input voltage and outputting a signal when said input voltage exceeds said first comparison voltage;a second set of switches for selectively coupling at least one of said plurality of taps to an input of a second voltage comparator, said second voltage comparator for comparing said second comparison voltage with said input voltage and outputting a signal when said input voltage is below said second comparison voltage; andcontrol logic for selectively activating selected ones of said first and second sets of switches by decoding a plurality of received control signals.