A low-power binary-search ADC system based on full dynamic structure

Abstract

The present invention claims to protect a low-power Binary-Search ADC system based on a full dynamic structure, which includes a bootstrap sampling circuit, a full dynamic comparator array with a preamplifier and a decoder array, wherein the bootstrap sampling circuit includes a charge pump circuit, bootstrap sampling switch and sampling capacitor; decision array includes dynamic preamplifier, dynamic comparator and back end decoder array for each stage. The purpose of the present invention is to improve all the main modules in the circuit into a dynamic structure, when there is no control timing input, the circuit does not work, and most of the timing signals for the control circuit operation are generated by the circuit structure itself, so that the power consumption can be further improved. reduce. The innovation is that compared with the traditional structure, the present invention has a significant effect on reducing the power consumption of the circuit based on the full dynamic structure. The full dynamic structure of the present invention can not only reduce the power consumption of the circuit, but also reduce the influence of the offset voltage of the circuit by the dynamic amplifier and ensure the accuracy.

Description

technical field [0001] The invention belongs to the field of analog integrated circuits, and mainly relates to a method of changing the traditional ADC preamplifier array structure into a full dynamic preamplifier structure, and using the output of the pre-stage comparator array to control the operation of the pre-amplifier array, so as to reduce the circuit complexity and reduce circuit power consumption. Background technique [0002] With the rapid development of modern CMOS integrated circuit technology, the society's demand for analog integrated circuits has not been completely replaced by digital circuits as predicted by experts at the end of the last century, but has shown a booming trend. The reason is that the use of circuits In the process of work, it is inevitable to encounter the conversion between analog signals and digital signals. The signals in nature are analog quantities from a macro perspective, while the computer processes digital signals. How to convert t...

AI Technical Summary

Problems solved by technology

Compared with the fastest and simplest Flah ADC, because its area and power consumption increase exponentially with the accuracy, and there is little room for improvement, it has basically not been further developed.

The most popular SAR ADC itself has unique advantages in low power consumption and medium and high precision, but the speed can only be improved by changing the architecture and adding channels.

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