Two-step incremental analog-digital converter and two-step conversion method

Abstract

The invention provides a two-step incremental analog-digital converter. The two-step incremental analog-digital converter comprises a trigonometric integral modulator and a decimation filter, wherein the trigonometric integral modulator is composed of an adding circuit, N-1 cascade integrators, stepped selection integrators, a comparator, re-selectors and a digital-analog converter; the decimation filter is composed of an N-order digital filter and an decimator; one input end of the first re-selector is connected to an input signal Vin; the output end of the first re-selector is connected to the adding circuit; the output end of the adding circuit is connected to the N-1 cascade integrators; the output ends of the N-1 cascade integrators are connected to the input end of the second re-selector; the output end of the second re-selector is respectively connected with the first stepped selection integrator and the second stepped selection integrator; the output ends of the first stepped selection integrator and the second stepped selection integrator are connected to the input end of the third re-selector; simultaneously, the output end of the first stepped selection integrator is connected to another input end of the first re-selector; the output end of the third re-selector is connected to the comparator; and the output end of the comparator is respectively connected with the adding circuit and the decimation filter. The two-step incremental analog-digital converter disclosed by the invention is high in precision, low in power consumption, rapid to convert and high in signal-to-noise ratio.

Description

technical field [0001] The invention relates to a two-step incremental analog-to-digital converter and a two-step conversion method using the converter, belonging to the technical field of electronic circuit design and manufacture. Background technique [0002] The role of the analog-to-digital converter (Analog-to-Digital Converter, ADC) is to convert an analog signal into a corresponding digital signal, and is widely used in electronic systems. High-performance sensors require the used analog-to-digital converter (ADC) to achieve high conversion accuracy, meet low power consumption, small size requirements, and increase conversion speed at the same time. [0003] In the existing technology, such as figure 1 , for discrete-time input systems, the incremental delta-sigma analog-to-digital converter (Sigma-Delta ADC) has the advantage of high precision over other types of converters, but the conversion speed and power consumption are large. The incremental delta-sigma analo...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a two-step incremental analog-to-digital converter, which is applied to high-performance sensors. While achieving high precision, the conversion speed is i

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