Analog/digital conversion using successive approximation and redundant weighting

Abstract

Illustrative binary networks for analog / digital converters are described. For instance, an analog / digital converter may operate in accordance with a principle of successive approximation, and may include a plurality of N+1 circuit nodes each representing one of N binary weights and M>=1 redundant binary weights, wherein each binary weight corresponds to a different position of a redundant binary code formed as part of the approximation. Illustrative methods of operation of the binary network and / or the analog / digital converter are also described.

Description

technical field [0001] The invention relates to a binary network for digital / analog conversion of an analog / digital converter operating on the principle of the successive approximation method. The invention also relates to an analog / digital converter comprising a corresponding binary network and a corresponding method involving digital / analog conversion according to the principle of the successive approximation method. Background technique [0002] The functional principle of the successive approximation method represents an important method of operation for analog / digital converters. In this method, the required numerical value is determined in an iterative search process. For this purpose, the analog input voltage to be converted is compared with an analog threshold voltage by a comparator. The digital input word of the digital / analog converter is generated by an approximation register, also called SAR (Successive Approximation Register), connected downstream of the comp...

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Problems solved by technology

[0014] Non-binary networks have their disadvantages compared to binary networks: with non-binary networks, the individual weights in principle present a poorer match, and any self-calibration of the weights is complicated

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