Logic control circuit for SAR analog-to-digital converter and SAR analog-to-digital converter

Abstract

The invention discloses a logic control circuit for an SAR (Synthetic Aperture Radar) type analog-to-digital converter and the SAR type analog-to-digital converter, which are used for storing obtained digital codes and controlling the digital-to-analog converter to perform level switching, and comprise two or more than two logic modules connected in series; wherein a trigger signal (Di) of the first logic module in the series connection of the modules is connected with a first clock control signal, and the trigger signal of the logic module in the series connection of the modules is connected with an output signal (S) of the output end of the logic module connected before the series connection of the logic module; wherein a control signal of each logic module is used for being connected with a second clock control signal and a third clock control signal; an input signal of each logic module is used for being connected with a comparator output (VOUTP); and an output signal (Di.Vref) of each logic module is used for being connected with a lower polar plate of a capacitor of a digital-to-analog converter. The logic control circuit for the SAR type analog-to-digital converter is simple in structure, the common-mode level of the input voltage of a comparator can be kept unchanged, the number of components is reduced, power consumption is reduced, and the power consumption and complexity of the analog-to-digital converter can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a logic control circuit for a SAR type analog-to-digital converter. Background technique [0002] Analog to Digital Converter (ADC), as a key interface circuit between analog circuits and digital circuits, is an important bridge connecting analog systems and digital signal processing systems. Among them, the successive approximation type (Successive Approximation Register, SAR) ADC has the characteristics of small size, medium and high resolution, low power consumption, and relatively simple structure, which makes the SAR ADC widely used. In recent years, the rapid development of portable devices has made microelectronic systems with low power consumption and simple structure more and more favored, and how to reduce the power consumption and the complexity of circuit structure has become a research focus in recent years. [0003] The SAR ADC mainly includes a samplin...

AI Technical Summary

Problems solved by technology

[0004] For high-speed SAR ADCs, the traditional logic control circuit is mainly composed of D flip-flop basic units, which account for a large proportion of the power consumption of the entire system

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