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针对遥测PCM模拟源输出信号单一及参数不可调的问题,提出了一种多通道波形输出可调的PCM信号源的设计。设计中以FPGA作为逻辑控制芯片,充分利用其灵活性、内部资源与特点。在对信号源设计方案和硬件电路简要描述的基础上,重点介绍了其通信协议和软件实现方法,最后对信号源进行了试验。试验结果表明,该信号源能够实现1 024以内任意通道输出波形可调的功能,并支持8位和16位字长可选。
Aiming at the problem of single and non-adjustable parameters of telemetry PCM analog source, a design of PCM signal source with multi-channel waveform output is proposed. FPGA design as a logic control chip, make full use of its flexibility, internal resources and features. Based on the brief description of signal source design scheme and hardware circuit, the communication protocols and software implementation methods are introduced emphatically. At last, the signal source is tested. The test results show that the signal source can be achieved within 1 024 arbitrary channel output waveform adjustable function, and supports 8-bit and 16-bit word length optional.