基于FPGA的数控移相正弦信号发生器的设计

摘要

This paper present an approach of designing a digital phase shifting sine wave generator based on FPGA technology with VHDL and the simple periphery circuit. The generator is a frequency and phase controllable sine signal generator using DDS with FPGA chip and DA converter. The paper also show the work principle of DDS, circuit structure ,and the idea of designing and realizing method. The digital phase shifting sine wave generator can generate two sine waves with preconcerted and adjusted frequency and phase difference. The frequency is from 20Hz to 20kHz,and the range of phase difference has achieved 0-359° step up 1 °.%本文介绍了基于FPGA技术，利用VHDL编程并加以简单的外围电路构成的数控移相正弦信号发生器。具体应用FPGA芯片及D／A转换器，采用直接数字频率合成技术（DDS），设计实现了一个频率、相位可控的正弦信号发生器。采用此方法设计的数控移相正弦信号发生器能够产生频率、相位均可数字式预置并可调节的两路正弦波信号，频率范围为20Hz至20kHz，相位差范围为0．359°，步进为1°。