Automatic calibration system for a ramp voltage generator

摘要

An automatic calibration for a ramp voltage generator includes a ramp voltage generator circuit responsive to a clock signal for providing a ramp voltage during a ramp voltage period; a comparator responsive to the ramp voltage for indicating whether the ramp voltage has reached a predetermined reference voltage level in the ramp voltage period; and a ramp rate control circuit responsive to the comparator for adjusting the ramp voltage generator circuit to drive the ramp voltage to obtain the predetermined reference voltage level in the ramp voltage period.