多通道高采样率任意波形发生器的设计

任意波形发生器是一种可以产生任意激励信号的测量仪器。输出波形带宽、通道数目以及通道间同步精度是任意波形发生器的关键指标。为了实现高带宽、多存储器并行的结构，并行存储技术被用来突破相位累加器和波形查找表工作速度的限制，然而该结构却存在比传统结构更加复杂的同步误差。针对此问题，该文分析了采用多存储器并行结构的任意波形发生器的同步需求，通过时钟、触发信号的精密分配以及内嵌相位校准模块设计，消除了数据时钟的随机初始相位、随机触发位置以及分频造成的随机相位差。最后对设计的任意波形发生器的相应指标进行测试验证。

Design of High Speed Multi-Channel Arbitrary Waveform Generator

Arbitrary waveform generator (AWG) is a instrument which can generate arbitrary excitation signal. Output bandwidth, the number of channels and synchronous accuracy between different channels are the key specifications of AWG. In order to achieve high bandwidth, a multi-memories parallel structure is proposed to break through operation speed limitation of phase accumulator and look-up table. However, this structure introduces more complex synchronous error than traditional structures. The synchronization requirements of AWG with multi-memories parallel is analyzed emphatically in this article. The random initial phase of data clock and random trigger position are eliminated by deliberate distributing clock and trigger signal. The design of embedded phase calibration module is used to eliminate the random phase difference. Finally, the specifications of AWG are verified.