Successive approximation analog-to-digital conversion transpose

Abstract

The invention discloses a successive approximation type analog-to-digital conversion device which comprises a comparison device, a successive approximation register logic circuit and two digital-to-analog conversion devices. The digital-to-analog conversion device comprises a capacitor array and a plurality of multipath selection devices; the capacitor array comprises a bridge capacitor, and an LSB array and an MSB array which are connected through the bridge capacitor; each of the LSB array and the MSB array comprises at least one first capacitor; each first capacitor is correspondingly connected with one multi-path selection device; the comparison device and each multi-path selection device are respectively connected with the successive approximation register logic circuit; and the two digital-to-analog conversion devices are respectively connected with the positive input end and the negative input end of the comparison device. According to the successive approximation type analog-to-digital conversion device, the capacitor array is divided into the LSB array and the MSB array, differential nonlinearity can be improved, exponential increase of the number of capacitors is reduced, and therefore the total area and power consumption of the capacitor array are greatly reduced.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to a successive approximation analog-to-digital conversion transpose. Background technique [0002] SARADC (Successive Approximation Analog-to-Digital Converter) is a widely used circuit. In recent years, with the development of circuit technology, implantable biosensor interface and multi-channel neural recording technology have been widely used in various biological experiments. An analog-to-digital converter (ADC), which is a basic circuit block, is one of the key components in the design of such sensing systems. Due to the limited power budget and area constraints, the implant solution faces great challenges. For the regular demand of 8-12 bit slow sampling rate, SARADC (Successive Approximation Analog-to-Digital Converter) is widely used in implantable biological data acquisition circuits. [0003] Implantable biological data acquisition circuits have high require...

AI Technical Summary

Problems solved by technology

The SAR ADC in the prior art has the defects of excessive power consumption and excessive area, and cannot well meet the needs of implantable biological data acquisition circuits in practical applications.

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