Sigma-delta ramp loading calibration

摘要

A continuous automatic calibration system and apparatus using a delta-sigma modulation technique. A first time duration is set. The first time duration is a length of time in terms of clock counts for a calibration procedure. Then, a second time duration occurring during the first time duration is measured. The second time duration is a length of time in terms of clock counts that a counter is operational. A multiplying factor is determined by dividing the first time duration by the second time duration.