The paper presents a novel loopback test method for frequency response characterization of Digital-to-Analog Converters (DACs). As in traditional loopback test method, the DAC output is acquired by means of a digitizer. However, by relying on Compressive Sampling (CS), the proposed method reduces the sampling frequency requirements for the digitizer allowing to embed it in the DAC. In this case, an automatic compensation of the DAC frequency response can be implemented. In the paper, the mathematical formulation of the method and its experimental evaluation are presented. The obtained results demonstrate that the proposed measurement method based on CS could benefit from a significant sampling rate reduction respect to the Nyquist one.

本文提出了一种用于数模转换器 (DAC) 频率响应特性的新型环回测试方法。与传统的环回测试方法一样，DAC 输出是通过数字化仪获取的。然而，通过依赖压缩采样 (CS)，所提出的方法降低了数字化仪的采样频率要求，允许将其嵌入 DAC。在这种情况下，可以实现 DAC 频率响应的自动补偿。文中介绍了该方法的数学公式及其实验评价。获得的结果表明，所提出的基于 CS 的测量方法可以受益于相对于 Nyquist 方法的显着采样率降低。