标题： Xampling：亚奈奎斯特率下的模拟到数字转换 显示英文标题

标题： Xampling: Analog to Digital at Sub-Nyquist Rates

摘要： 我们提出了一种适用于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，这是一种灵活的平台，可根据信号的实际带宽占用情况进行采样。 理论工作使得例如亚奈奎斯特宽带接收器成为可能，该接收器无需事先了解发射机载波位置。 我们的设计支持具有2 GHz奈奎斯特率和120 MHz频谱占用的输入信号，且传输频率任意。 采样率低至280 MHz。 据我们所知，这是首个报道的亚奈奎斯特转换宽带硬件。 此外，模块化设计在分辨率位数和满量程范围方面已被证明可以与最先进的奈奎斯特ADC竞争。 我们描述了各种电路设计考虑因素，重点在于转换器引入的非典型挑战：将信号与多组正弦波混合，而不是单个本地振荡器，以及生成高度瞬态的周期性波形，其瞬态间隔与奈奎斯特率相当。 一系列硬件实验验证了设计并展示了亚奈奎斯特采样。 显示英文摘要

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.