Overflow compensating method and device for correcting MEMS elapsed time clock

Abstract

The invention provides an overflow compensating method and device for correcting an MEMS elapsed time clock. The method comprises the steps that an initial frequency error value of the MEMS elapsed time clock under a current temperature value is obtained; an underclocking parameter needed for frequency obtaining is computed; the initial frequency error value is used as an initial value to carry out sequential accumulation, and when an accumulation value numerical value is larger than or equal to 1, 1 is overflowed; when the numerical value is smaller than or equal to -1, -1 is overflowed; when the numerical value is larger than -1 and smaller than 1, overflowing does not happen; and the underclocking ratio with the value being the sum of the underclocking parameter and an overflowing value is used for carrying out underclocking on the practical output frequency of the MEMS elapsed time clock, and the needed frequency is obtained. A 0 / 1 sequence is used for equalizing the initial frequency error value of the MEMS elapsed time clock under a certain temperature, double-way overflow compensation is achieved, an expanding scheme is easy to implement, and cost advantages are achieved.

Description

technical field [0001] The invention belongs to the technical field of clock correction, and relates to a method for correcting a MEMS timing clock, in particular to an overflow compensation method and device for correcting a MEMS timing clock. Background technique [0002] Any digital system works according to the predetermined functional timing according to the clock beat, so the clock source is essential. The clock sources on the SOC chip in the electronic system are commonly used a crystal oscillator (Crystal Oscillator) and an RC oscillator (RC Oscillator). With the maturity of MEMS (Micro-Electro-Mechanical Systems, Micro-Electro-Mechanical Systems) technology, the new MEMS clock (MEMS Oscillator) is gradually entering the market application. [0003] Compared with the traditional quartz crystal method, the biggest advantage of MEMS clock lies in its integrability. Since the production material of the MEMS clock is also based on the Si process, it is easy to integrat...

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a method and device for correcting the overflow compensation of the MEMS timing clock, which is used to solve the problem that the output frequency of the existing MEMS timing clock drifts with temperature changes

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