Design of Large Dynamic Range Data Acquisition System Based on FPGA
A large dynamic range multi-channel data acquisition system based on FPGA was designed to address the limita-tions of traditional data acquisition systems,such as signal overload for large signals and signal loss for small signals during meas-urements.The impact of noise correlation and amplifier gain on the dynamic range was discussed.The system employed a discrete architecture with synchronized dual ADC acquisition units and combined the high-speed parallel processing capabilities of FPGA for data fusion,real-time control of the front-end variable-gain amplification circuit was implemented,enabling high-resolution ac-quisition of small signals and high tolerance for large signals in the multi-channel data acquisition system.An experimental proto-type using the AD7768 chip with a maximum dynamic range of 108 dB was tested,demonstrating a dynamic range exceeding 160 dBat a sampling frequency of 64 kHz.The system achieved a sampling accuracy of 0.1％,linearity better than 0.005％,and inter-channel phase accuracy of±0.05°.
dynamic rangedata acquisitionFPGAmultichannelreal-time controlparallel processingvariable gain
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