Fast oscillation starting type programmable crystal oscillator circuit with low power consumption

Abstract

The invention discloses a fast oscillation starting type programmable crystal oscillator circuit with low power consumption, and relates to the technical field of integrated circuits. The fast oscillation starting type programmable crystal oscillator circuit comprises: an independent current source is connected with a current control circuit, the current control circuit is connected with an amplifying circuit, a first output end of a crystal oscillator is connected with an input end of the amplifying circuit, a second output end of the crystal oscillator is connected with the output end of theamplifying circuit, the crystal oscillator is connected with a first comparator, the first comparator is connected with a second comparator, the second comparator is connected with a level conversioncircuit, the level conversion circuit is connected with a first inverter, the first inverter is connected with a counter and a AND gate, the counter is connected with a logic digital circuit, the counter is connected with the AND gate, the AND gate is connected with the second inverter, the second inverter outputs a signal, and the logic digital circuit is connected with the current control circuit. The fast oscillation starting type programmable crystal oscillator circuit disclosed by the invention has the advantages that when the amplitude of oscillation of the crystal oscillator is relatively large, some switches are turned off, continuous oscillation is maintained, fast oscillation starting is achieved by high current, and low current and low power consumption are achieved after the oscillation starting.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a programmable crystal oscillator circuit with low power consumption and rapid start-up. Background technique [0002] With the advent of the Internet of Things era, smart home and smart health industries are bound to generate greater demand for MCU chips. With the development of single-chip microcomputer technology (MCU chip), the rapid development of semiconductor technology and technology has greatly improved the performance of MCU products to meet the requirements of the current development trend of the Internet of Things, especially low power consumption and low cost have become an urgent need for integrated circuit design. Require. [0003] Crystal oscillators can provide high-precision clock signals for various electronic systems, but in different application environments, the requirements for crystal oscillator circuits are also different. For example, some ...

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Problems solved by technology

[0033] The technical problem to be solved by the present invention is that the existing crystal oscillator cannot achieve low power consumption and fast start-up

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