基于直接数字频率合成的可编程遥测信号源

针对传统的遥测信号源缺乏灵活可配置性、通用性差的问题,提出采用FPGA和DDS技术为核心设计灵活可配置的可编程遥测信号源。该信号源的硬件电路主要由低成本FPGA芯片和DDS芯片组成,采用Verilog语言进行编程,使FPGA控制核心输出不同的相位、频率、波形等控制字信息给DDS芯片,经DDS芯片后输出所需波形。仿真表明,该信号源能够输出频率范围在0～12.5MHz的频率、相位可调的正弦波、三角波、方波等波形信号,具有一定的通用性。

Programmable telemetry signal source based on direct digital frequency synthesis

Traditional telemetry signal source lacks of flexibility and universality.In order to solve this problem,a telemetry signal source based on field programmable gate array(FPGA) and direct digital frequency synthesis(DDS) chip is proposed.The hardware circuits of the signal source are mainly composed by low-cost FPGA Cyclone chip and DDS chip,and the software is designed by Verilog HDL.FPGA can send different control words of phase,frequency and wave to DDS chip,and output the wave.The simulation result shows that the system can output various wave in the range of 0~12.5 MHz,and can be used generally.