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A precision spectrometer for measuring signals from the Epoch of Cosmological Recombination

机译：一种精密光谱仪，用于测量来自宇宙重组时代的信号

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The rapid advances in processing capabilities of modern Field Programmable Gate Array (FPGAs) combined with high-speed analog-to-digital converters (ADC) make high-resolution, high dynamic range spectroscopy for verifying the signature of the Epoch of Recombination possible. A prototype 4 GHz precision spectrometer, based on quadrature sampling of analog signals followed by an efficient, parallelizable FFT architecture amenable to implementation inside an FPGA is described. Quadrature sampling of two analog signals, each having a bandwidth of about 2 GHz, is implemented using 10-bit, time-interleaved ADCs that has features for correction of gain, offset and phase mismatches. A combination of pipelined FFT IP-cores and a custom-designed parallel FFT engine provide 8192 spectral channels across each of the 2 GHz bands. Since the spectral purity of the sampling clock is an important consideration in precision applications, the effect of normally distributed jitter in the sampling clock on the deviations from a flat spectrum while sampling a band-limited white noise is presented.
机译：现代领域可编程门阵列（FPGA）的加工能力的快速进步与高速模数转换器（ADC）结合生产高分辨率，高动态范围光谱，用于验证可能的重组时期的签名。一种原型4 GHz精密光谱仪，基于模拟信号的正交采样，然后描述了可在FPGA内部的有效，并行化的FFT架构进行了高效的，并行化的FFT架构。使用10位，时间交织的ADC来实现两个具有约2GHz的带宽的模拟信号的正交采样，该ADC具有用于校正增益，偏移和相位不匹配的特征。流水线FFT IP-CORE和定制的并行FFT引擎的组合在2 GHz带中提供了8192个频谱通道。由于采样时钟的光谱纯度是精密应用中的重要考虑因素，因此呈现了在采样在采样带限量的白噪声的平板上的偏差上的采样时钟中的正常分布抖动的影响。

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