ADC multi-input signal crosstalk model circuit

Abstract

The invention provides an ADC multi-input signal crosstalk model circuit. A circuit structure and a connection relationship are provided .Capacitance value and a coupling coefficient of a coupling capacitor are determined by the distance between two input ends. The capacitance value of the coupling capacitor is reduced by changing the distance between the two input ends; the crosstalk amplitude between the signal input ends can be reduced; the distance is calculated between the signal input ends corresponding to the crosstalk amplitude by using the model circuit; and curve fitting is performedon crosstalk amplitude test results corresponding to different distances between the signal input ends to obtain a fitting formula, and the distance between the corresponding signal input ends is calculated by using the obtained fitting formula according to crosstalk amplitude index requirements. Due to the fact that the ADC design is used, the integration degree of the three-dimensional acceleration is improved, and the design area of the chip is reduced. The optimal distance between the signal input ends can be quickly determined according to the crosstalk model circuit fitting graph, and the design efficiency of the circuit is improved.

Description

technical field [0001] The invention relates to the field of signal crosstalk, in particular to an ADC multi-input signal crosstalk model circuit. 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 occupy a large chip 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. However, the three-dimensional acceleration signal has crosst...

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes an ADC multi-input signal crosstalk model circuit for the above-mentioned multi-channel signal crosstalk at the ADC input terminal

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