Method and device for calibrating clock frequency

Abstract

The embodiment of the invention discloses a method and a device for calibrating a clock frequency. The device comprises a clock detection circuit, a calibration circuit, and a parameter-adjustable oscillator. The clock detection circuit is used for counting clock signals output by the parameter adjustable oscillator at regular time to obtain a count value, judging the absolute value of the difference between the calculated count value and an expected count value is larger than or equal to a preset threshold value or not, and outputting a first enable signal to the calibration circuit to control the calibration circuit to enter a working state. The calibration circuit is used for receiving the first enable signal so as to enter the working state, outputting a control signal to the parameter-adjustable oscillator according to the obtained count value, and driving the parameter-adjustable oscillator to adjust the frequency of the clock signals. The parameter-adjustable oscillator is usedfor outputting the outputted clock signals to the clock detection circuit and other clock signal-based circuits, and adjusting the frequency of the clock signals according to the control signal. According to the embodiment of the invention, the influence of the change of the ambient environment and the application temperature on the clock frequency of the oscillator is reduced. The precision of the frequency of the oscillator is improved, and the power consumption is reduced.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a method and device for calibrating clock frequency. Background technique [0002] In recent years, the application of electronic technology in the fields of medical care, finance, and the Internet of Things has provided a new direction for the development of integrated circuits, and has also driven the rapid development of the integrated circuit industry. Consumer electronics has developed from traditional electronic products, such as computers, mobile phones, and household appliances, to some new electronic products, such as all-in-one cards, non-contact integrated circuit (IC, Integrated Circuit) cards, smart hardware, etc. At present, the clock frequency of integrated circuit chips is getting higher and higher, and this also puts forward higher and higher requirements for the clock signal of the entire system. When the operating frequency of an integrated circuit chip reac...

AI Technical Summary

Problems solved by technology

However, as the oscillator continues to work, changes in the surrounding environment and application temperature will cause the clock frequency of the oscillator to deviate from the original oscillation frequency, resulting in a large error in the frequency of the oscillator, and may affect the functional error of the circuit

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