Linearization Processing Method of Nonlinear Analog/Digital Conversion Based on FPGA Control

Abstract

The invention discloses a linearization processing method of nonlinear analog / digital conversion based on FPGA control. The analog / digital converter is controlled by the finite state machine in the FPGA to convert the signal. The conversion state of the analog / digital converter includes initial state, conversion start state, conversion completion judgment state, and data output state; the A / D converter transmits the converted data signal to the FPGA for linearization processing; repeated measurements are performed multiple times, and the obtained multiple sets of linearized data Calculate the average; transmit the averaged data signal to the host computer for denoising processing. Linearize the data signal through the FPGA, and then average it for multiple measurements, saving the troublesome division calculation, and finally remove the white noise mixed in the signal, so as to eliminate when the nonlinear A / D input is in the Around 0V, the data abnormal phenomenon occurs when the A / D output is averaged, so as to obtain stable data output.

Description

technical field [0001] The invention relates to the field of signal simulation, in particular to a linearization processing method for nonlinear analog / digital conversion based on FPGA control for thermopile detectors. Background technique [0002] In various fields of modern production and life, it is often necessary to measure multiple signals, and the measured signals are mostly analog signals, which must first undergo A / D (analog / digital) conversion and become digital signals before they can be sent to the computer for corresponding processing. Processing, so as to realize the control of the system, this process involves the acquisition and processing of signals. Today's FPGA (Field-Programmable Gate Array: Field Programmable Gate Array) chips not only have strong logic control capabilities, but also have strong digital signal processing capabilities, so applying FPGAs to the field of signal acquisition and processing has become a A future development trend. Here we ta...

AI Technical Summary

Problems solved by technology

The thermopile detector is a temperature-sensitive detector. When there is no external incident light, the output voltage often hovers around 0V due to the existence of noise voltage. Therefore, on the thermopile detector type optical power meter, when there is no light Under irradiation, data abnormalities often appear after multiple measurements and averaging

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