Binary-Search ADC system with low power consumption based on full-dynamic structure

Abstract

The invention requests to protect a low-power-consumption Binary-Search ADC system based on a full-dynamic structure. The low-power-consumption Binary-Search ADC system comprises a bootstrap samplingcircuit, a full-dynamic comparator array with a pre-amplifier and a decoder array, and the bootstrap sampling circuit comprises a charge pump circuit, a bootstrap sampling switch and a sampling capacitor; a decision array comprises a dynamic preamplifier, a dynamic comparator and a rear-end decoder array of each stage. The invention aims to enable all main modules in the circuit to be improved into a dynamic structure, the circuit does not work when no control time sequence is input, and most of time sequence signals for controlling the circuit to work are generated by the circuit structure, so that the power consumption is further reduced. The innovation point is that compared with a traditional architecture, the system has a remarkable effect of reducing the circuit power consumption based on a full-dynamic structure. According to the full-dynamic structure, the power consumption of the circuit can be reduced, the offset voltage influence of the circuit is reduced by the dynamic amplifier, and the precision is ensured.

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 work of the preamplifier array to reduce the circuit complexity and reduce circuit power consumption. Background technique [0002] With the rapid development of modern CMOS integrated circuit technology, 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 trend of vigorous development. It is inevitable to encounter the conversion between analog signals and digital signals in the process of work. The signals in nature are all analog quantities from a macro point of view, while the computer processes digital signals. How to convert the analog quantities in nature into...

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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