Low input signal crosstalk multipath time division multiplexing SAR ADC circuit system

Abstract

The invention provides a low input signal crosstalk multipath time division multiplexing an SAR ADC circuit system. The circuit system comprises a special multi-input crosstalk model circuit, a single-ended to double-ended circuit, a successive approximation type analog-to-digital converter SAR ADC, latches Latch _ A, Latch _ B and Latch _ C and a sequential control circuit. By adding the specialmulti-input crosstalk model circuit to the input ends of the SAR ADC, the interference of crosstalk signals between the input ends on sampling signals is suppressed, and the accuracy of SAR ADC outputsignals is improved. According to the invention, the integration level of three-dimensional acceleration is improved, and the area of a chip is reduced; due to the adoption of the special multi-inputcrosstalk model circuit, the problem of crosstalk of multiple paths of sampling signals at the input end is solved; a fully differential structure is adopted to design a multi-channel time division multiplexing SAR ADC, and the interference of input common-mode noise on an SAR ADC circuit is reduced.

Description

technical field [0001] The invention relates to the field of low input signal crosstalk, in particular to a multi-channel time-division multiplexing SAR ADC circuit system with low input signal crosstalk. Background technique [0002] An accelerometer is an inertial sensor that measures acceleration. It is widely used in spacecraft navigation, missile guidance, and automotive automatic driving. An analog-to-digital converter (ADC), a device that converts an analog signal into a digital signal, plays a key role in an accelerometer. A three-dimensional accelerometer usually uses three analog-to-digital converters (ADCs) to sample the acceleration signals of each dimension and then convert them into digital signals. Since the use of three ADCs will increase the chip design area, which is not conducive to the integration of the three-dimensional accelerometer, so using one ADC to sample the three-dimensional acceleration signals at different time periods can save the chip area....

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem of crosstalk occurring at the signal input end of multi-channel time-division multiplexing ADC, and invents a low-input signal crosstalk multi-channel time-division multiplexing SAR ADC circuit system applied to three-dimensional accelerometers

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