Non-linear analog/digital conversion linearization processing method based on FPGA (field-programmable gate array) control

Abstract

The present invention discloses a non-linear analog / digital conversion linearization processing method based on FPGA (field-programmable gate array) control. The method comprises the following steps: controlling an analog / digital converter to convert signals by a finite-state machine in an FPGA, wherein the conversion state of the analog / digital converter comprises an initial state, a conversion starting state, a conversion completing judgment state and a data output state; transmitting converted data signals to the FPGA to implement linearization processing by the analog / digital converter; implementing repeated measurement for a plurality of times to compute an average value of multiple groups of obtained data which are subjected to linearization processing; and transmitting averaged data signals to an upper computer to implement denoising. According to the non-linear analog / digital conversion linearization processing method disclosed by the invention, the data signals are subjected to linearization processing through the FPGA, and then are measured for a plurality of times to obtain the average value so as to ensure that troubled division calculation can be saved, and white noises mixed in the signals can be finally removed, and thus a data exception phenomenon existing in a process of averaging A / D output when the non-linear A / D output is about 0V can be eliminated, and a stable data output can be obtained.

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 GateArray: 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 future a development trend. Here we tak...

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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