Development of a superconductive digital RF receiver by the sub-Terahertz circuit block implementation

我们尝试用块实现技术在Nb单通量量子(SFQ)集成电路(IC)上实现高温超导(HTS)电路，以实现带宽更宽、灵敏度更高的数字射频接收器。关键部件是这种接收器中的模数转换器(ADC)。在这项研究中，我们演示了基于HTS电路的调制器的120 GHz工作，调制器是ADC的前端部分。我们还成功地演示了基于SFQ IC的抽取过滤器和ADC。我们已经完成了块实现技术的开发。

We tried to implement high-temperature-superconductor (HTS) circuits on Nb single flux quantum (SFQ) integrated circuits (ICs) with a block implementation technique for a digital RF receiver having wider band widths and higher sensitivity. The key component is an analog-to-digital converter (ADC) in such a receiver. In this study, we demonstrated 120-GHz operation of a modulator, the front-end part of an ADC, based on an HTS circuit. We also successfully demonstrated decimation filters and ADCs based on the SFQ ICs under a cryocooler. We have already finished development of a block implementation technique.