DIGOTA architectures have attracted growing interest as a means of addressing the problems that arose with the extreme miniaturization of the MOS transistor in analog design. Despite the increasing number of proposed architectures, the literature remains fragmented, with differences in design goals, structural choices, and evaluation criteria that make direct comparison difficult. This paper presents a comprehensive survey of DIGOTA architectures reported in the literature so far. This review study is organized according to key architectural characteristics, including biomedical applications, flexible electronics, and low-power amplifiers. Based on this analysis, the paper discusses major trends, common trade-offs, strengths, and limitations across current approaches. The survey also identifies open issues and promising directions for future research. By providing a structured overview of the field, this work serves as a useful reference for researchers seeking to understand, compare, and develop DIGOTA architectures.
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