无线电工程

数字正交调制器是软件无线电体系中关键组成部分,小型化、通用化、参数可配置是数字正交调制器发展需求。基于ADI公司正交上变频器AD9957芯片特点,提出了一种基于AD9957的通用数字正交调制器的设计方案,具有参数可变、硬件结构简单、集成度高、数字成形的特点。给出了核心硬件电路框图,进行了设计实现和测试,与参考数据进行了对比,实测结果与参考数据基本一致。

Digital quadrature modulator is one of the key parts of Software Radio system.Now the miniature、universal and parameter-configured digital quadrature modulator is required.Based on the features of QDUC chip-AD9957,a new design solution of universal digital quadrature modulator based on AD9957 is proposed,and it features variable parameters,simple hardware structure,high-degree integration,and digital shaping,etc.Finally,the core hardware circuit theory diagram and the experiment results of are given.Test results show that the actual signal performance is basically in consistent with reference data.