The output bandwidth and the capacity to generate multiple analog outputs with high-accuracy synchronization are essential specifications of an arbitrary waveform generator (AWG). The popularity of high-speed digital-...
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The output bandwidth and the capacity to generate multiple analog outputs with high-accuracy synchronization are essential specifications of an arbitrary waveform generator (AWG). The popularity of high-speed digital-to-analog converter (DAC) and high data throughput double data rate synchronous dynamic random access memory (DDR SDRAM) has led to current AWG reaching the output wideband with gigahertz level. However, as the operating frequency increases, the signal propagation delay in the AWG becomes more sensitive to the clock signals, the trigger signal, and the channel differences, making the AWG's output synchronization more challenging. For the accuracy synchronization of high-speed wideband AWG outputs, this article establishes a propagation model by analyzing the effects of clock signals, the trigger signal, and the channel differences on the propagation delay of waveform signals in the AWG channel. The corresponding synchronization design methods are discussed for each factor, and a synchronizationstructure of scalable multichannel high-speed AWG is proposed. Furthermore, a channel delay adjustment technique based on the digital method is used to correct the time skew between outputs. Finally, an experimental platform for eight-channel AWG and two-channel AWG has been designed according to the proposed method. The experimental results show that the number of output channels of AWG can be adjusted quickly according to the proposed scalablestructure, and the synchronization accuracy can reach +/- 5 ps at 5-GS/s sampling rate.
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