基于DDS的信号发生器设计

摘要

Abstract

冯熙璇

mppt兴利

摘要

马斯洛

随着数字集成电路、微电子技术和EDA技术的深入研究，DDS技术以其有别于其它频率合成技术的优越性能和特点，成为现代频率合成技术中的佼佼者。它是将先进的数字信号处理理论与方法引入到信号合成领域的一项新技术，它的出现为进一步提高信号的频率稳定度提供了新的解决方法。同时，随着微电子技术的迅速发展，尤其是单片机技术的发展，智能仪器也有了新的进展，功能更加完善，性能也更加可靠，智能程度也不断提高直接数字式频率合成技术的出现,导致了频率合成领域的一次重大革命。根据题目要求，我们以单片机AT89S52芯片和AD9850芯片为核心，辅以必要的模拟电路，设计一台信号发生器，使之能产生正弦波、方波和三角波。该系统频率、幅值均可调节，相比传统信号发生器的性能，具有频带宽、频率稳定、波形良好、接口简单、编程方便、成本低、易小型化等优点。

关键词：信号发生器；单片机；直接数字式频率合成技术

Abstract

As digital integrated circuits, microelectronic technology and EDA technology in-depth study, DDS technology is different from other frequency synthesis technology for its superior performance features .It becomes a better modern frequency synthesis technology in the crowd.财会月刊 It is a new technology of bringing the advanced digital signal processing theory and methods to the field of signal synthesis. Its appearance provides a new solution to further improve the frequency stability of the signal. Meantime, with the rapid development of microelectronics technology, particularly the development of microcomputer technology, intelligent instrument also made new progress, and more complete features, more reliable performance, with the intelligent degree increasing the appearance of direct digital frequency synthesis which led to the emergence of a major revolution of Synthesis in the field. Under the title, we use AT89S52 microcontroller chip and AD9850 chip as the core, supplemented by the essential analog circuits, designing a

signal generator, so that it can produce sine, square and triangular wave. The system’s frequency and amplitude can be adjusted, compared by the performance of the traditional signal generator, with a frequency bandwidth, a stable frequency, wave good, simple interface, programming easily, low cost, easy miniaturization.

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