准确的高速等效时间采样接收器:架构和性能指标

IF 5.9 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Aaron D. Pitcher;Charl W. Baard;Mihail S. Georgiev;Natalia K. Nikolova
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引用次数: 0

摘要

提出了一种采用现场可编程门阵列(FPGA)控制的等时间采样超宽带(UWB)双通道接收机。它具有可编程的重复周期和ET采样率[高达每秒20千兆样本(GSa/s)]。该架构采用可编程延迟芯片(PDC),在典型的$1~ $ 5的重复周期内实现超过8900走线/秒的超高速。与先前报道的高速(基于pdc)接收器相比,它提供了更高的时间采样精度。该设计集成了一个定制的双通道射频(RF)前端和一个低抖动时钟源,这对于实现时间采样稳定性至关重要。重要的是,提出了一种简单而有效的方法来纠正由PDC引起的系统时基失真,其延迟精度是实现皮秒采样间隔的ET接收机的主要信号退化因素。所实现的低成本系统作为一个高速示波器运行,其10db接收器带宽为6ghz,精度可与台式高速示波器相媲美。提出了性能指标和测量程序来评估和比较时间采样接收器。这些应用于拟议的接收机,包括作为紧凑型脉冲雷达的一部分的测试。将其性能与两个高速台式示波器以及先前报道的ET接收器原型进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Accurate High-Speed Equivalent-Time Sampling Receiver: Architecture and Performance Metrics
An equivalent-time (ET) sampling ultra-wideband (UWB) dual-channel receiver is proposed, which is controlled by a field-programmable gate array (FPGA). It has a programmable repetition period and ET sampling rate [up to 20 gigasamples per second (GSa/s)]. The architecture employs a programmable delay chip (PDC) to achieve ultra-high speed of over 8900 traces/s for a typical $1~\mu $ s repetition period. Compared with previously reported high-speed (PDC-based) receivers, it offers superior time-sampling accuracy. The design incorporates a custom dual-channel radio frequency (RF) front end with a low-jitter clock source, critical in achieving time-sampling stability. Importantly, a simple yet effective method is proposed to correct the systematic timebase distortions due to the PDC, whose delay inaccuracies are the main signal-degradation factor in ET receivers realizing picosecond sampling intervals. The realized low-cost system operates as a high-speed oscilloscope with a 10-dB receiver bandwidth of 6 GHz and with accuracy comparable to that of bench-top high-speed oscilloscopes. Performance metrics and measurement procedures are proposed to evaluate and compare time-sampling receivers. These are applied to the proposed receiver, including tests as part of a compact pulsed radar. Its performance is compared with two high-speed bench-top oscilloscopes as well as previously reported ET receiver prototypes.
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来源期刊
IEEE Transactions on Instrumentation and Measurement
IEEE Transactions on Instrumentation and Measurement 工程技术-工程:电子与电气
CiteScore
9.00
自引率
23.20%
发文量
1294
审稿时长
3.9 months
期刊介绍: Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications. The scope of these papers may encompass: (1) theory, methodology, and practice of measurement; (2) design, development and evaluation of instrumentation and measurement systems and components used in generating, acquiring, conditioning and processing signals; (3) analysis, representation, display, and preservation of the information obtained from a set of measurements; and (4) scientific and technical support to establishment and maintenance of technical standards in the field of Instrumentation and Measurement.
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