Microchip Technology Incorporated
Near constant delay comparator for closed-loop system

Abstract:

A voltage comparator and a programmable counter coupled to a high-speed clock are used to provide a near constant delay time for use in a closed-loop system. The voltage comparator input-output time delay is characterized at a certain temperature and operating voltage then variances in the voltage comparator delay times over a range of operating temperatures and voltages are measured and/or extrapolated. A number of clock pulses used for a delay time count are programmed into the programmable counter to provide for a near constant delay time from a change at the input of the voltage comparator to a change at the output of the programmable counter.