基于奈奎斯特采样定理和FPGA器件设计了一款采样率自适应分配的双踪数字示波器.采用双通道共享双A/D,按照输入信号带宽比自适应分配二通道采样率的方案,有效地解决了传统模式下二通道采样率无法相互调剂的弊端,从而显著提高了示波器的带宽上限和采样效率.在总采样率约束下,较传统采样模式,带宽上限提高近2倍,对高斯分布下的信号带宽采样效率提高约1.5倍.%Based on the Nyquist sampling theorem and FPGA devices,a sampling rate adaptively-allocating dual-trace digi-tal oscilloscope was designed. The two channels sharing dual A/Ds are adopted to allocate two channels′ sampling rates in accor-dance with the bandwidth ratios of input signals,and overcome the disadvantage that the sampling rates cannot be mutually sup-ported between two channels in the traditional mode,thereby the bandwidth upper limit and sampling efficiency of the oscillo-scope are significantly raised. Under the constraint of the total sampling rate,the upper limit of the bandwidth is nearly dou-bled,and the sampling efficiency is increased by roughly 1.5 times for signals′ bandwidths in Gaussian distribution,in compari-son with the traditional sampling mode.
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