矢量信号源中IQ调制器的设计与实现

Design and implementation of IQ modulator in vector signal generator

实现了一种应用于矢量信号源中的新型IQ调制器。其中,硬件电路包括FPGA电路,滤波、放大、输出电路以及控制器电路,软件设计主要有基带信号发生器和基于改进型CORDIC算法的IQ调制。该调制器不但可以直接实现MASK,MFSK,MPSK,QPSK,MSK以及QAM等调制,还可以产生正交载波信号。仿真与实际测试结果证明了该设计的正确性和优越性。

A novel IQ modulator used in vector signal generator was implemented,whose hardware circuit includes FPGA circuit,filtering circuit,amplification circuit,output circuit and controller circuit,and software design mainly includes baseband signal generator and IQ modulator based on modified-CORDIC algorithm. The IQ modulator can not only implement the modulation of MASK,MFSK,MPSK,QPAK,MSK and QAM directly,but also generate orthogonal carrier signal. Simulation and practical testing results demonstrate the correctness and superiority of the design.