Offset compensation apparatus for biasing an analog comparator

摘要

A threshold comparator for use with a dual slope A/D converter has its input potential established at its threshold potential during auto-zeroing. Potential offset means is included in the auto-zero feedback loop around the integrating and output amplifiers of the A/D circuit. Bias current applied to the potential offset means substantially tracks current passed in the comparator so that the potential developed by the potential offset means substantially tracks the threshold potential of the comparator.