System for generating broadband radio frequency signal

Abstract

The invention discloses a system for generating a broadband radio frequency signal, comprising a host computer, a PCIe bus, an FPGA main board and a DAC board, wherein the host computer is configuredto generate a digital signal and transmit an analog signal to the FPGA main board through the PCIe bus, the FPGA main board is configured to transmit the digital signal to the DAC board through a control logic unit, and the control logic unit includes a clock management module, a data cache module, a secondary data cache module, a data rate conversion module and an initialization configuration logic module. The invention has the advantages that the system is large in bandwidth of the generated radio frequency signal, high in precision, high in hardware design integration and less in device usage, the data transmission logic overcomes the shortage of clock rate mismatch of the FPGA and DAC, the host computer software supports rich signal patterns, the implementation manner is simple and flexible, and various types of wideband radio frequency signals can be generated in a relatively simple manner under a small volume to meet the needs of various application scenarios.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a broadband radio frequency signal generating system. Background technique [0002] For the development of broadband signal sources, Rao Ruinan implemented a 0.1-5GHz comb spectrum generator by building an analog circuit and using step recovery diodes. Although this type of method can generate signals with a larger bandwidth, the signal pattern that can be generated Insufficient richness; In view of the low flexibility of analog signal generation, Yan Guanghua, Liu Yujun and others used DDS technology to propose a method of using FPGA to generate baseband digital signal data to generate signals; Qing Hao further implemented this method, using Xilinx Virtex4 FPGA and AD9957 chip as the core, designed a signal source that can generate a maximum hop speed of 200Khops / s in the 40-240MHz bandwidth range, but it can only generate frequency hopping signals, which limit...

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Problems solved by technology

[0002] For the development of broadband signal sources, Rao Ruinan implemented a 0.1-5GHz comb spectrum generator by building an analog circuit and using step recovery diodes. Although this type of method can generate signals with a larger bandwidth, the signal pattern that can be generated Insufficient richness; In view of the low flexibility of analog signal generation, Yan Guanghua, Liu Yujun and others used DDS technology to propose a method of using FPGA to generate baseband digital signal data to generate signals; Qing Hao further implemented this method, using Xilinx Virtex4 FPGA and AD9957 chip as the core, designed a signal source that can generate a maximum hop speed of 200Khops/s in the 40-240MHz bandwidth range, but it can only generate frequency hopping signals, which limits the application range of the device; Dong Keqiang designed with AD9953 as the core 0-150MHz broadband signal source, but it can only generate baseband ...

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