模拟到数字在次奈奎斯特速率
Xampling: Analog to Digital at Sub-Nyquist Rates
摘要：
提出了一种宽带输入的亚奈奎斯特模数转换器。我们的电路实现了最近提出的调制宽带转换器，这是一个灵活的平台，根据他们的实际带宽占用采样信号。理论工作使得，例如，一个子奈奎斯特宽带接收机，它没有事先的信息，发射机载波位置。我们的设计支持2 GHz奈奎斯特速率和120 MHz频谱占用的输入信号，具有任意传输频率。采样率低至280 MHz。据我们所知，这是第一个报告的亚奈奎斯特转换宽带硬件。此外，模块化设计在分辨率位和满量程范围方面可与最先进的奈奎斯特ADC相媲美。我们描述了各种电路设计考虑因素，重点是转换器引入的非常规挑战：将信号与多组正弦波（而不是单个本机振荡器）混频，以及生成高瞬态周期波形，瞬态间隔为奈奎斯特速率。一系列的硬件实验验证了该设计，并演示了欠奈奎斯特采样。
英文摘要：
We present a sub-Nyquist analog-to-digital converter of wideband inputs. Our circuit realizes the recently proposed modulated wideband converter, which is a flexible platform for sampling signals according to their actual bandwidth occupation. The theoretical work enables, for example, a sub-Nyquist wideband receiver, which has no prior information on the transmitter carrier positions. Our design supports input signals with 2 GHz Nyquist rate and 120 MHz spectrum occupancy, with arbitrary transmission frequencies. The sampling rate is as low as 280 MHz. To the best of our knowledge, this is the first reported wideband hardware for sub-Nyquist conversion. Furthermore, the modular design is proven to compete with state-of-the-art Nyquist ADCs in terms of resolution bits and full-scale range. We describe the various circuit design considerations, with an emphasis on the nonordinary challenges the converter introduces: mixing a signal with a multiple set of sinusoids, rather than a single local oscillator, and generation of highly-transient periodic waveforms, with transient intervals on the order of the Nyquist rate. A series of hardware experiments validates the design and demonstrate sub-Nyquist sampling.
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