Trimming code generation circuit, trimming system and method based on successive approximation principle

Abstract

The present invention provides a trimming code generating circuit, trimming system and method based on the principle of successive approximation, the trimming code generating circuit includes: a voltage generating circuit, a comparator, and a trimming code generating unit, and a trimming code generating unit Connected between the comparator and the voltage generating circuit; the trim code generating unit outputs the pre-trimmed code to the voltage generating circuit, and the voltage generating circuit outputs the pre-trimmed voltage to the comparator according to the pre-modified code; the comparator compares the pre-modified voltage and the reference voltage and output a comparison result to the trim code generation unit; and the trim code generation unit sequentially performs N trimming bits in the pre-modulation code from high to low based on the first clock signal and / or the comparison result Set trimming operation, and after each setting trimming operation, latch and output an N-bit pre-trimming code, and after the lowest trimming bit completes the setting trimming operation, generate an N-bit trimming code. The invention solves the problem that the trimming code cannot be accurately obtained through the existing calculation method or table look-up method.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a trim code generation circuit based on the successive approximation principle, a trim system and a method thereof. Background technique [0002] In the field of integrated circuits, due to the influence of the distribution of the process itself, the parameters of the produced chips will have a certain distribution. In applications that require parameter accuracy, it is necessary to use trimming methods to reduce the influence of parameter distribution and improve parameter accuracy. consistency to meet application requirements. Such as figure 1 and figure 2 As shown, the parameter value distribution is very wide before the trimming, but the parameter value concentration is greatly improved after the trimming. [0003] Currently known trimming methods mainly include electrical trimming, laser trimming, eFuse or EEROM code writing trimming. The trimming code trims the fuse....

AI Technical Summary

Problems solved by technology

[0012] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a trimming code generation circuit based on the successive approximation principle, a trimming system and a method thereof, which are used to solve the problems in the prior art through calculation methods or look-up tables. The problem that the method cannot accurately obtain the correction code

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