基于FPGA的脉压信号采集卡设计
Pulse Pressure Signal Acquisition Card Design Based on FPGA
刘忠睿 1任勇峰 1贾兴中1
作者信息
- 1. 中北大学电子测试技术重点实验室仪器科学与动态测试教育部重点实验室 太原 030051
- 折叠
摘要
由于频带较宽的脉压信号在采集和传输过程中容易受到噪声的干扰而导致信号失真,论文针对这一问题,设计了一种高精度的脉压信号采集电路,从脉压信号的频率特性出发,分别从硬件电路和逻辑控制两方面对信号调理滤波及采样量化做了优化处理.采集信号在经过LTC1569的组合滤波电路后,在250kHz处衰减在3dB以内,且通带内信号波形稳定.同时通过优化采样电路,采用大于输入信号频率的8倍过采样和去极值算法滤波算法,经过多次实验,该采集卡的通道采集精度均优于0.1%,满足设计要求.
Abstract
As the pulse voltage signal with wide frequency band is easily distorted by noise interference in the acquisition and transmission process,this paper addresses this problem by designing a high-precision pulse voltage signal acquisition circuit,start-ing from the frequency characteristics of the pulse voltage signal,and optimizing the signal conditioning filtering and sampling quan-tization from both the hardware circuit and logic control.The acquired signal can be attenuates within 3dB at 250kHz after the com-bined filtering circuit of LTC1569,and the signal waveform is stable in the passband.At the same time,by optimizing the sampling circuit,oversampling and de extreme algorithm filtering algorithms that are 8 times larger than the input signal frequency are used.After many experiments,the channel acquisition accuracy of the acquisition card is better than 0.1%,which meets the design re-quirements.
关键词
脉压信号/频率响应/过采样/FPGAKey words
pulse pressure signal/frequency response/oversampling/FPGA引用本文复制引用
基金项目
国家自然科学基金重点项目(62131018)
山西省基础研究计划(202103021222012)
出版年
2024
国家科技期刊平台
NSTL
万方数据