Optimized and corrected RC oscillation module and method

Abstract

The invention discloses an RC oscillation module and method for optimizing correction, and the module comprises an RC adjustable oscillator which is used for adjusting the output frequency according to an input correction value; the RC oscillation frequency measurement module is used for providing a numerical value of the RC oscillation frequency output by the RC adjustable oscillator for external calibration equipment; the RC oscillation frequency measurement module comprises a counter connected with the output of the RC adjustable oscillator; the counter is used for calculating the numerical value of the RC oscillation frequency; an external calibration device; and the correction module is used for comparing the obtained RC oscillation frequency output by the RC oscillation frequency measurement module with a target frequency, and outputting a correction value to the RC adjustable oscillator or stopping correction according to a comparison result. According to the invention, the value of the RC oscillation frequency under corresponding correction can be obtained through multiple times of correction without measurement through a measuring device.

Description

technical field [0001] The invention relates to the technical field of RC oscillation modules, in particular to an optimized and corrected RC oscillation module and method. Background technique [0002] RC oscillating circuit is easy to implement in chip design, but its disadvantage is that the wafer process has poor correlation, resulting in low precision, and the output oscillation frequency deviation is large. In the past, it was used in low frequency oscillation output 1M ~ 4MHz, generally there will be positive and negative The error is between 10%, and the higher frequency used in system integration chips today is 10MHz-250MHz, and the error is about plus or minus 30%. Therefore, it is necessary to perform correction actions after the chip is produced to adjust to the precise frequency requirement. [0003] The general calibration method is to use an RC circuit with controllable frequency, then measure the output frequency by the measuring equipment, adjust the freque...

AI Technical Summary

Problems solved by technology

The patent document with the publication number TW200418270A discloses a chip oscillation module and a calibration method, in which the calibration method needs to cooperate with external frequency measurement equipment and calibration parameters need to manually write back the program, and the calibration process relies on external equipment and complicated operations

The calibration method needs to measure the output frequency equipment, so it needs to be perfected in the early stage of chip packaging, but for the recalibration and adjustment of the integrated packaged wafer, because there is no output frequency pin to measure, it cannot implement

Therefore, when the internal frequency needs to be increased when the originally provided frequency is insufficient, or when the product is unstable and needs to be lowered, if there is no convenient correction mechanism and method, the product will be scrapped and the cost of re-production time will be spent, so it can solve the two problems. It is necessary to speed up the reaction speed of products to the market through sub-calibration and optimal correction methods

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