Pulse Pressure Signal Acquisition Card Design Based on FPGA
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.
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