Fast start relaxation oscillator and electronic device

Abstract

The application discloses a fast-starting relaxation oscillator and electronic equipment, and relates to the technical field of oscillators. The circuit comprises a constant current source, a digital adjustment module for adjusting the current size of the constant current source, a first charging circuit, a second charging circuit, a first comparator, a second comparator and a transistor-level cross-coupled latch. The input end of the first charging circuit is connected with the output end of the digital adjustment module. The second charging circuit is connected in parallel with the first charging circuit. The positive input end of the first comparator is connected with the positive pole of a first capacitor. The reverse input end of the first comparator is connected with a reference voltage. The positive input end of the second comparator is connected with the positive pole of a second capacitor. The reverse input end of the second comparator is connected with the reference voltage. The input end of the transistor-level cross-coupled latch is connected with the output ends of the first comparator and the second comparator. The output end of the transistor-level cross-coupled latch is connected with the controlled ends of the first charging circuit and the second charging circuit. The circuit can eliminate the reset dead zone problem through the double-capacitor alternating charging result.

Images