Design and Implementation of a Preprocessing Circuit for Bandpass Signals Acquisition
Design and Implementation of a Preprocessing Circuit for Bandpass Signals Acquisition
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DOI：
10.1109/tim.2013.2278564
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发表时间：
2014-02-01
影响因子：
5.6
通讯作者：
Vadursi, Michele
中科院分区：
文献类型：
--
作者：
D'Arco, Mauro;Genovese, Mariangela;Vadursi, Michele
实时数字示波器采集模块中包含的处理能力在很大程度上决定了仪器的整体性能。他们的显着改善，使其能够提高性能方面的测量速率，自动化，并减少测量不确定性相关的量化和噪声。本文提出了一种新的带通信号采集模式的预处理电路的实现，其特点是增加了垂直分辨率。虽然最近提出的理论基础与模拟结果，在这里，电路实现这样的采集模式。重点是中或低成本的数字示波器，可以提高其垂直分辨率在一个微不足道的额外成本。首先，一个初步的现场可编程门阵列实现被认为是从理论的角度来看，并在整个实验测试评估可实现的性能。然后，一个定制的专用集成电路实现，在28纳米互补金属氧化物半导体技术进行了分析。沿着参数的优化，工作实验测试的采集模式和评估的非理想特性，如有限字长和非理想滤波的影响。有效位数（ENoB）的增加高达2.5位，而由于字长和非理想滤波导致的ENoB劣化被量化为类似于1.1和0.5位。该设计强调，有大量的利润率并行实现的基础候选人提出的解决方案作为一个显着的选择，为下一代示波器。
The processing capabilities that are included into the acquisition block of the real-time digital oscilloscopes largely contribute to determine the overall performance of the instrument. Their remarkable improvement has made it possible to enhance the performance in terms of increased measurement rate, automation, and reduced measurement uncertainty related to quantization and noise. This paper presents the implementation of a preprocessing circuit for a novel acquisition mode of bandpass signals, which is characterized by an increased vertical resolution. Although the theoretical foundations were recently presented with simulative results, here, the circuital implementation of such an acquisition mode is presented. The focus is on mid or low cost digital oscilloscopes that can improve their vertical resolution at a negligible additional cost. First, a preliminary field programmable gate array implementation is considered to evaluate the achievable performance both from a theoretical point of view and throughout experimental tests. Then, a custom application specific integrated circuit implementation, in 28-nm complementary metal-oxide-semiconductor technology is analyzed. Along with the parameter optimization, the work experimentally tests the acquisition mode and evaluates the effects of nonideal characteristics such as finite word length and nonideal filtering. The increase in the effective number of bit (ENoB) is up to 2.5 bit, whereas the ENoB degradation because of word length and nonideal filtering is quantified as similar to 1.1 and 0.5 bit. The design highlights that there is substantial margin for parallel implementation that is the base to candidate the proposed solution as a remarkable option for the next generation oscilloscopes.