Current steering DAC buck-boost correction method and circuit

Abstract

The invention discloses a current steering DAC buck-boost correction method and circuit. The method comprises the steps that: mirror image value: n pairs of code values are taken with a code value N to be converted as a center value, the n pairs of code values are A1 to An and B1 to Bn, the code values A1 to An are larger than the code value N, the code values B1 to Bn are smaller than the code value N, n is a positive integer, and the mean value of each pair of code values is N; within a certain time T, any code value is extracted from the code values B1 to Bn, N and A1 to An in a non-repeated mode and output to a digital-to-analog conversion unit until all (2n+1) code values are extracted, and the maintaining time of each code value is the same; and output adjustment: the adjusting unitadjusts the output of the digital-to-analog conversion unit, so that the output voltage of the buck-boost circuit is stable. According to the current steering DAC buck-boost correction method in the technical scheme, the influence caused by mismatch of a single code value is reduced through round robin of the mirror image code value, the differential nonlinearity of digital-to-analog conversion isreduced, and the monotonicity of buck-boost voltage regulation output is improved.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a current steering DAC buck-boost correction method and a current steering DAC buck-boost circuit capable of implementing the method. Background technique [0002] With the development of consumer electronic products, the requirements for charging technology are becoming more and more stringent, and buck-boost circuits are becoming more and more popular. In recent years, mobile phones, tablets, smart watches and TWS have entered the homes of ordinary people. Today, when there is no breakthrough in battery technology, battery life has become a parameter that must be mentioned in all consumer electronics products. Charging is an indispensable part of it. An indispensable link has been paid more and more attention by power supply manufacturers. High-voltage fast charging and low-voltage direct charging technologies have also emerged, USB Type_C ports have become popular, and the a...

AI Technical Summary

Problems solved by technology

Due to changes in environmental factors such as temperature and heat, as well as some factors of the current source array itself, large jumps often occur when individual code values ​​are converted into corresponding voltage values ​​or current values, which is difficult to meet the monotonic requirements of the buck-boost circuit

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