Weight calibration method of non-binary successive approximation type analog-digital converter

Abstract

The invention discloses a weight calibration method for a non-binary successive approximation type analog-digital converter, the non-binary successive approximation type analog-digital converter comprises a capacitor array and a virtual capacitor C0, the capacitor array comprises n capacitors, and n capacitor values from the largest to the smallest are Cn, Cn-1, Cn-2, Cn-3 toC1, and C1 is equal toC. According to the weight calibration calculation method of the mth capacitor, the redundant weight Rm of the mth capacitor is larger than 0, and the mth capacitor refers to the mth capacitor with the capacitance value from low to high in the capacitor array. The invention provides a weight calibration method for the non-binary successive approximation type analog-to-digital converter. Sequential control logic optimization is carried out on sampling and conversion process so that the digital logic of the calibration algorithm is simplified, only the accumulation average process is carried out. Meanwhile, the method has a faster operation result, and only one quantization error is introduced when noise is small.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a weight calibration method of a non-binary successive approximation analog-to-digital converter. Background technique [0002] An analog-to-digital converter (ADC) can convert analog signals into digital signals, and is a key means of obtaining information from nature. As an important medium for obtaining information, ADC is widely used in industrial measurement, wireless communication, image recognition and other fields. With the further development of science and technology, there are more and more requirements for efficient acquisition of information in various fields, and the demand for high-speed and high-precision ADCs continues to increase. [0003] There are many types of ADCs. According to the basic price, they mainly include: Sigma-Delta, single slope, SAR, pipeline, flash, etc. Compared with other ADCs, SAR ADC has the characteristics of high cost perfor...

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Problems solved by technology

[0006] But the method disclosed in the patent CN109347477A still has deficiencies, the main reason is that the design of numbers is relatively complicated, and this algorithm must adopt a subtraction operation, and there are the following three problems: (1) the subtraction consumes extra storage space and calculation unit; (2) ) If the mismatch and noise are large, the redundant space obtained in a single calculation process is small; (3) If the noise is small and the average value is relatively normalized, the algorithm will introduce two quantitative statistical errors

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