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为给微弱信号检测中的锁定放大器提供高性能的相关信号源,采用C8051F005单片机直接教字频率合成产生了2路4相相关正弦波信号。为保证所有输出信号满足相关性要求,在单片机程序中必须采用同一个长的正弦波数据表。本文介绍了用MATLAB生成这种任意长度的数据表的方法。
In order to provide a high-performance signal source for the lock-in amplifier in weak signal detection, the 2-phase 4-phase sine wave signal is generated by directly synthesizing the C8051F005 single-chip word frequency synthesizer. To ensure that all output signals meet the dependencies, the same long sine wave data sheet must be used in the microcontroller program. This article describes the use of MATLAB to generate this arbitrary length of the data sheet.