1、 摘摘 要要 随着数字集成电路、微电子技术和 EDA 技术的深入研究，现代频率合成技 术具有很大研究性。根据题目要求，我们以单片机 LM3S811 为核心，辅以必要 的模拟电路，设计合成信号发生器。该系统主要由 LM3S811 单片机、方波发生 器、分频电路、滤波电路、调理电路、加法电路等模块组成。本系统采用 TLC083 芯片产生方波振荡电路，通过施密特触发器 CD40106 芯片进行波形变换后得到 300KHz方波信号，经过 30 分频、10 分频、6 分频电路后得到 10KHz、30KHz、 50KHz信号，经过 TLC04 芯片进行滤波，得到相应频率但不同幅值的正弦信号， 再通过由 T
2、LC085 构成的调理电路对相位和幅度进行调节， 最后通过加法电路将 三路正弦信号合成近似方波和三角波。测试表明，其结构紧凑，电路简单，可扩 展性强，统功能完善，很好的实现了各项设计指标。 关键词关键词：信号波形合成 分频器 滤波器 2 Abstract Along with the digital integrated circuits, microelectronics technology and EDA technology research, has great modern frequency synthesis technology research. According to
3、the topic request, we LM3S811 as the core, with single-chip microcomputer with necessary analog circuits, design and synthesize signal generator. This system mainly consists of LM3S811 single-chip microcomputer and square-wave generator frequency circuit, filtering, points circuit and regulate circu
4、it, addition circuit module. The system USES the TLC083 chip produce square-wave oscillating circuit, through CD40106 chips for waveform Schmitt toggle 300KHz square wave signal transformation, after get 30 points frequency, 10 points frequency, 6 points frequency circuit 10KHz, 30KHz, after we get TLC04 50KHz signals, after filtering, obtained corresponding chip frequency but different amplitude of the sine signals, then TLC085 constitute by the modulation circuit to phase and amplitude adj
