High-speed analog quantity acquisition board card based on FPGA + MCU

Abstract

The invention discloses a high-speed analog quantity acquisition board card based on FPGA + MCU. The high-speed analog quantity acquisition board card comprises a signal conditioning circuit, an ADC sampling circuit, an FPGA chip, an MCU processor and a communication module. The FPGA chip comprises an ADC controller, a front end FIFO memory, a DDR3 controller, a rear end FIFO memory and a DDR3 SDRAM memory. The signal conditioning circuit comprises a differential circuit, an 8-bit dial switch, an instrument amplifier, a low-pass filter circuit and a voltage follower circuit, and the signal conditioning circuit receives analog signals sent by sending equipment, filters noise of the analog signals, conditions the analog signals into + / -10V analog signals and outputs the + / -10V analog signals. According to the invention, the signal conditioning circuit is used for differential input; the voltage drop on the ground wire can be compensated; the input ranges of + / -50V, + / -25V and + / -12.5 V signals and the three low-pass filtering cut-off frequencies of 20Hz, 300Hz and 10kHz can be configured by toggling corresponding switches of the 8-bit dial switch, so that the detection of signals indifferent ranges and the filtering of noise in different frequency bands are realized.

Description

technical field [0001] The invention relates to the technical field of automobile detection, in particular to a high-speed analog acquisition board based on FPGA+MCU. Background technique [0002] When testing electronic components such as automotive controllers, it is necessary to collect various analog quantities. With the development of detection technology, automobile detection system puts forward higher requirements for parameters such as sampling accuracy and collection rate of data collection. Industrial on-site detection signals have the characteristics of strong real-time performance, high frequency, complex processing, huge amount of pre-processed data, and on-site processing. Perform high-speed transfers. For data acquisition systems, MCU and FPGA are currently the most widely used processors. Although the MCU has advantages in power consumption and cost, the processing speed cannot meet the requirements. The FPGA chip can realize high-speed data collection, ...

AI Technical Summary

Problems solved by technology

The existing signal conditioning circuit has the following defects: the conditioning circuit is often adjusted for a specific voltage input range, which cannot meet the conditioning of signals in different voltage ranges, and filters noise above a fixed frequency, and cannot switch the filter circuit as required cutoff frequency

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