High-Speed Bandwidth Acquisition System Based on Intermediate Frequency Signal Processing
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Keywords

Software radio
IF signal
Digital down-conversion
FPGA
AD9680

DOI

10.26689/ssr.v7i3.10014

Submitted : 2025-03-04
Accepted : 2025-03-19
Published : 2025-04-03

Abstract

In the high-speed bandwidth acquisition and playback system, due to the current hardware conditions, it is impossible to directly sample the signal at the RF end. Therefore, first complete the down-conversion in the RF module, reduce the signal to the intermediate frequency, and then realize the digitization of the intermediate frequency signal. In response to this problem, a field programmable logic array chip (FPGA) and AD9680 were selected to process the intermediate frequency signal. Use AD9680 to collect the mid-band pass signal with a center frequency of 750 MHz and a bandwidth of 400 MHz as a signal source for test verification, and then pass through a parallel multiphase digital down-conversion module to achieve spectrum shifting. It is verified by testing that the design can normally process the intermediate frequency signal, and the out-of-band suppression reaches 60 dB, which meets the design requirements, has high stability, and has high application value in engineering applications.

References

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Li ZJ, 2019, Development of PXIe Intermediate Frequency Digitizer, thesis, Harbin Institute of Technology.

Zhao YL, 2008, Design and Implementation of Signal Acquisition and Processing System based on FPGA, thesis, Nanjing University of Science and Technology.

Peng DL, Wang X, Chen XH, et al., 2013, Hardware Circuit Design of High-speed Data Acquisition System based on Band-pass Sampling Theorem. Instrumentation Technology and Sensors, 2013(5): 72–74.

Wu NX, 2020, Research on FPGA-based High-speed and High-precision ADC/DAC Data Deep Storage and Digital Frequency Conversion System, thesis, University of Chinese Academy of Sciences (School of Artificial Intelligence, Chinese Academy of Sciences).