A Broadband Radio Frequency Signal Generation System

Abstract

The invention discloses a broadband radio frequency signal generating system, which includes a host computer, a PCIe bus, an FPGA mainboard, and a DAC board. The host computer is used to generate digital signals and transmit analog signals to the FPGA mainboard through the PCIe bus. The FPGA The main board transmits the digital signal to the DAC board through the 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 radio frequency signal generated by the present invention has large bandwidth, high precision, high integration of hardware design, less use of devices, data transmission logic overcomes the lack of clock rate mismatch between FPGA and DAC, host computer software supports rich signal styles, and the implementation method is simple and flexible , and can generate various wide-band radio frequency signals in a relatively simple way with 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 generation 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...

AI Technical Summary

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 signals, not radio frequency signals; in order to further expand the performance of the equipment, Hu Maohai, Yu Yong, Xiang Yunlong and others adopted the multi-channel splicing technology, using the AD9910 chip to build The DDS signal source with multiple signals can form a wide-band signal through the synthesis of multiple signals, expanding the maximum bandwidth of the signal to 400MHz, but due to the performance limitation of the DDS chip, it cannot directly generate radio frequency signals; Tang Shuwei, Feng Relying on the AD9910 chip, Yuan Yuan, Bao Xiaoqi and others built a wide-band frequency generator using DDS and Pll technology, and realized frequency synthesis and widening through multiple local oscillators of different frequencies, realizing the output of radio frequency signals, but it is still based on The traditional superheterodyne structure needs to rely on the upconverter to realize the output of the radio frequency signal

Images