CMOS Low current RC oscillator

摘要

A very low current oscillator having a comparator and circuitry for providing a reference for the comparator is provided. A capacitor is coupled to one input of the comparator while the circuitry for providing a reference is coupled to another input of the comparator. A current source is used to charge the capacitor. The circuitry for providing a reference is capable of providing two different reference levels. A transistor to discharge the capacitor is coupled to the output of the comparator.