Pipelined-successive approximation register analog-to-digital converter applying open-loop gain stage

Abstract

The invention relates to a pipelined-successive approximation register analog-to-digital converter applying an open-loop gain stage. A signal channel is formed by connecting a first-level successive approximation register analog-to-digital converter circuit, a voltage gain which is used for amplifying a surplus voltage output by the first-level successive approximation register analog-to-digital converter circuit, a tunable gain for carrying out gain calibration on the voltage gain, and a second-level successive approximation register analog-to-digital converter circuit in sequence. The pipelined-successive approximation register analog-to-digital converter also comprises a pseudo-random number generator and a background calibration engine circuit, which are used for calibrating various simulation mismatches of the signal channel. The voltage gain is the open-loop gain stage. According to the converter, a relatively high signal to noise ratio can be obtained, a signal conversion speed and resolution can be improved, the system power consumption can be reduced, and the system robustness can be improved.

Description

technical field [0001] The invention belongs to the field of analog-to-digital converters, in particular to a pipeline successive approximation analog-to-digital converter using an open-loop gain stage. Background technique [0002] The wireless communication industry and large-scale digital integrated circuit technology have developed rapidly in the past ten years, and the analog-to-digital converter (ADC), as a bridge between the analog world and the digital world, has also achieved a qualitative leap in performance. However, as commonly used pipelined analog-to-digital converters (Pipeline ADC) and successive approximation analog-to-digital converters (SAR ADC), they are still limited by their system structures and have different shortcomings. Traditional Pipeline ADCs use multiple serial operations for data processing, which often requires multiple high-precision operational amplifiers with high power consumption, which is not conducive to low-cost and miniaturized desig...

AI Technical Summary

Problems solved by technology

However, the existing pipeline successive approximation analog-to-digital converters need to accurately amplify the residual voltage of the first-stage successive approximation analog-to-digital converters, and the capacitor matching requirements in the first and second-stage successive approximation analog-to-digital converters Very stringent, which leads to greater power consumption and area

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