SAR ADC (successive approximation register analog-to-digital converter) with resolution configurable

Abstract

The invention discloses an SAR ADC (successive approximation register analog-to-digital converter) with resolution configurable. The SAR ADC comprises a capacitive-type ADC, a comparator, a resolution rate-configuring SAR control logic circuit and a clock circuit. Compared with the conventional resolution rate configuring technical scheme of the SAR ADC, the SAR ADC has the advantages that a switch is not required to plug in the capacitive-type ADC to configure digits of the capacitive-type ADC, and the resolution rate of the ADC is directly configured based on the SAR control logic algorithm; a configuring switch is omitted in a capacitor array, thus locating and wiring of the layout is convenient and simple, and less stray capacitance and stray resistance is introduced among key nodes such as an upper plate and a lower plate of a capacitor; better performance is imparted, noise floor, outputting signal frequency spectrum, of the SAR ADC is decreased to the normal level under resolution rate modes, harmonic waves are eliminated, and dynamic behavior and static behavior of the ADC are remarkably improved.

Description

technical field [0001] The invention relates to the field of analog-to-digital converters, in particular to a successive approximation analog-to-digital converter with configurable resolution. Background technique [0002] With the continuous advancement of integrated circuit technology, the ability of digital circuits to process signals is getting stronger and stronger. However, in the real world, most of the signals that integrated circuits participate in processing are analog signals. For example, wireless signals received by antennas need to pass through low-noise amplifiers, mixers, filters, etc., and also need to pass through analog-to-digital converters (ADC, analog-to-digital converter) can be handed over to the digital circuit for processing. The analog voltage signal generated by the light signal, sound signal, temperature signal, and pressure signal after passing through the sensor also needs to be converted by ADC before being handed over to the digital circuit ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a resolution configurable SAR ADC, the present invention can solve the problem of low performance of SAR ADC in the existing resolution configurable scheme

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