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为了解决传统DDS信号发生器的输出波形种类少、幅频控制精度低等缺点,设计了基于SDIO与SPI接口的高精度信号发生器。首先,采用STM32F103作为核心控制器,SDIO接口作为用户波形数据交互口。其次,采用SPI接口将数据传送至WAV数据流解码芯片VS1053,解码后18位D/A输出。然后,采用程控放大器对输出波形进行幅值控制。最后,采用功率放大器进行功率放大。相比于传统信号发生器,可实现任意波形输出,且幅频可控。
In order to solve the shortcomings of the traditional DDS signal generator such as few output waveforms and low amplitude and frequency control precision, a high-precision signal generator based on SDIO and SPI interface is designed. First of all, using STM32F103 as the core controller, SDIO interface as the user waveform data interface. Second, using SPI interface to send data to WAV stream decoder chip VS1053, decoding 18 D / A output. Then, the use of programmable amplifier output waveform amplitude control. Finally, using a power amplifier for power amplification. Compared with the traditional signal generator, arbitrary waveform output can be achieved, and the amplitude and frequency control.