A hardware prototype of wideband high‐dynamic range analog‐to‐digital converter

• Published in: IET circuits, devices & systems devices & systems, 2023-07, Vol.17 (4), p.181-192
• Main Authors: Mulleti, Satish, Reznitskiy, Eliya, Savariego, Shlomi, Namer, Moshe, Glazer, Nimrod, Eldar, Yonina C.
• Format: Article
• Language: English
• Subjects: Algorithms; Analog to digital converters; analog‐to‐digital conversion; automatic gain control; Design; Dynamic range; Fourier transforms; Hardware; Prototypes; sample and hold circuits; Sampling; sampling methods; signal reconstruction; signal sampling
• ISSN: 1751-858X; 1751-8598
• DOI: 10.1049/cds2.12156

Key parameters of analog‐to‐digital converters (ADCs) are their sampling rate and dynamic range. Power consumption and cost of an ADC are directly proportional to the sampling rate; hence, it is desirable to keep it as low as possible. The dynamic range of an ADC also plays an important role, and ideally, it should be greater than the signal's; otherwise, the signal will be clipped. To avoid clipping, modulo folding can be used before sampling, followed by an unfolding algorithm to recover the true signal. Here, the authors present a modulo hardware prototype that can be used before sampling to avoid clipping. The authors’ modulo hardware operates prior to the sampling mechanism and can fold higher frequency signals compared to existing hardware. The authors present a detailed design of the hardware and also address key issues that arise during implementation. In terms of applications, the authors show the reconstruction of finite‐rate‐of‐innovation signals, which are beyond the dynamic range of the ADC. The authors’ system operates at six times below the Nyquist rate of the signal and can accommodate eight times larger signals than the ADC's dynamic range. The authors present a hardware prototype of a high‐dynamic range analog‐to‐digital converter (ADC) where a folding operation enhances the dynamic range. The authors show sampling and perfect reconstruction of different classes of signals whose dynamic ranges are larger than that of ADC's dynamic range.