Characterizing the performance of high-speed data converters for RFSoC-based radio astronomy receivers

Characterizing the performance of high-speed data converters for RFSoC-based radio astronomy receivers
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表征基于 RFSoC 的射电天文接收器的高速数据转换器的性能

DOI:
10.1093/mnras/staa3895
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发表时间:
2021
影响因子:
4.8
通讯作者:
Liu C
Liu C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu C

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射频片上系统 (RFSoC) 器件提供了在单板上实现完整射电天文接收器的潜力,但集成模数转换器 (ADC) 的性能至关重要。我们评估了 Xilinx ZU28DR RFSoC 中数据转换器的性能,这些转换器是 12 位、8 倍交错转换器,最大采样速度为每秒 4.096 千兆采样 (GSPS)。我们测量了 2.048 GHz 带宽上的无杂散动态范围 (SFDR)、信噪比和失真 (SINAD)、有效位数 (ENOB)、互调失真 (IMD) 以及相邻通道之间的串扰。我们都使用浮点运算捕获数据进行离线分析,并在 RFSoC 上实现了实时整数运算光谱仪。 ADC 的性能足以满足射电天文学应用的需求,并且在大多数情况下接近供应商的规格。我们进行了长达 100 秒的光谱积分和数十小时的稳定性测试,发现在这些时间尺度上热噪声限制性能。
RF system-on-chip (RFSoC) devices provide the potential for implementing a complete radio astronomy receiver on a single board, but performance of the integrated analogue-to-digital converters (ADCs) is critical. We have evaluated the performance of the data converters in the Xilinx ZU28DR RFSoC, which are 12-bit, 8-fold interleaved converters with a maximum sample speed of 4.096 Giga-sample per second (GSPS). We measured the spurious-free dynamic range (SFDR), signal-to-noise and distortion (SINAD), effective number of bits (ENOB), intermodulation distortion (IMD), and cross-talk between adjacent channels over the bandwidth of 2.048 GHz. We both captured data for off-line analysis with floating-point arithmetic, and implemented a real-time integer arithmetic spectrometer on the RFSoC. The performance of the ADCs is sufficient for radio astronomy applications and close to the vendor specifications in most of the scenarios. We have carried out spectral integrations of up to 100 s and stability tests over tens of hours and find thermal noise-limited performance over these time-scales.
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