中文摘要：

波形发生电路为开关线性复合式功率放大器的功率放大单元提供所需频率范围的柔性波形信号。介绍了一种基于直接数字频率合成技术的波形发生电路的设计方案。给出了系统设计的整体思路、主要功能模块电路的硬件电路设计及软件设计。设计中充分利用了单片机的控制管理功能和DSP快速处理能力，采用单片机作为波形发生电路的控制核心，DSP作为波形生成核心。通过对系统输出进行测试证明，该系统输出的波形信号具有较高的精度，可以满足开关线性复合式功率放大器对柔性信号的要求。

英文摘要：

Waveform generating circuit generates flexible waveforms of required frequency for power amplifying circuit in switch-linear hybrid power amplifier. A design of arbitrary waveform generating circuit based on DDS was presented, the overall design of the system, the hardware circuit of the main parts and the software design were given. MCU （micro-control-unit） acted as main control part because of its control and management ability while DSP worked as waveform generating part with its fast handling speed were used in the design. The test outputs of the proposed system prove the output waveforms of the system have high precision and meet the requirements of the switched linear hybrid power amplifier.