Clock signal generation circuit and electronic equipment

Abstract

The invention discloses a clock signal generation circuit and electronic equipment, and the circuit comprises: an ROSC module which is suitable for generating a clock signal; areference clock module which is connected with the ROSC module and is suitable for providing a reference clock signal; a temperature sensor which is connected with the ROSC module and is suitable for sensing the temperature;a voltage sensor which is connected with the ROSC module and is suitable for sensing voltage; a storage module which is connected with the temperature sensor, the voltage sensor and the ROSC module and is suitable for storing a basic calibration table, wherein fine adjustment data for temperature and voltage are recorded in the table. When the ROSC module is initialized, the frequency of the clock signal is corrected by utilizing the reference clock signal, otherwise, the ROSC module searches for matched fine adjustment data according to the temperature and the voltage to correct the frequency of the clock signal, and when the search time exceeds a preset threshold value, the reference clock signal is used for correcting the frequency of the clock signal, and the high-precision clock signal generation circuit based on the ring oscillator is low in price.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a clock signal generation circuit and electronic equipment. Background technique [0002] In a traditional solution, the clock signal may be generated by a real time clock (Real Time Clock, RTC for short) chip. The RTC chip includes a crystal oscillator (crystal). Because the price of the crystal oscillator is high, the cost of the RTC chip is high, and its price remains high. [0003] A ring oscillator (Ring OSCillatior, referred to as ROSC) can also generate a clock signal, but the disadvantage of ROSC is that its oscillation frequency changes with the influence of external factors, the frequency accuracy is low, and the frequency is unstable. The existing ROSC optimization scheme mainly uses Process Voltage Temperature (PVT) sensors to correct the frequency of the ROSC clock signal, but it is difficult for PVT sensors combined with ROSC to provide high-precision f...

AI Technical Summary

Problems solved by technology

The RTC chip contains a crystal oscillator (crystal). Due to the high price of the crystal oscillator, the cost of the RTC chip is high, and its price remains high.

[0003] A ring oscillator (Ring OSCillatior, referred to as ROSC) can also generate a clock signal, but the disadvantage of ROSC is that its oscillation frequency changes with the influence of external factors, the frequency accuracy is low, and the frequency is unstable

The existing ROSC optimization scheme mainly uses Process Voltage Temperature (PVT) sensors to correct the frequency of the ROSC clock signal, but it is difficult for PVT sensors combined with ROSC to provide high-precision frequency, and the clock accuracy cannot reach millions. One part (1part per million, referred to as 1ppm)

Therefore, in the circuit design of existing electronic equipment, once a high-precision clock signal is required, the more expensive RTC crystal oscillator is still used

[0004] At present, there is a lack of clock signal generation circuits that meet the accuracy requirements and are low in cost

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