Fruitwala Neelay, Strader Paschal, Cancelo Gustavo, Zmuda Ted, Treptow Ken, Wilcer Neal, Stoughton Chris, Walter Alex B, Zobrist Nicholas, Collura Giulia, Lipartito Isabel, Bailey John I, Mazin Benjamin A
Department of Physics, University of California, Santa Barbara, California 93106, USA.
Dominican School of Philosophy and Theology, 2301 Vine St., Berkeley, California 94708, USA.
Rev Sci Instrum. 2020 Dec 1;91(12):124705. doi: 10.1063/5.0029457.
We present the development of a second generation digital readout system for photon counting microwave kinetic inductance detector (MKID) arrays operating in the optical and near-infrared wavelength bands. Our system retains much of the core signal processing architecture from the first generation system but with a significantly higher bandwidth, enabling the readout of kilopixel MKID arrays. Each set of readout boards is capable of reading out 1024 MKID pixels multiplexed over 2 GHz of bandwidth; two such units can be placed in parallel to read out a full 2048 pixel microwave feedline over a 4 GHz-8 GHz band. As in the first generation readout, our system is capable of identifying, analyzing, and recording photon detection events in real time with a time resolution of order a few microseconds. Here, we describe the hardware and firmware, and present an analysis of the noise properties of the system. We also present a novel algorithm for efficiently suppressing IQ mixer sidebands to below -30 dBc.
我们展示了一种用于在光学和近红外波段工作的光子计数微波动态电感探测器（MKID）阵列的第二代数字读出系统的开发情况。我们的系统保留了第一代系统的许多核心信号处理架构，但带宽显著更高，能够读出千像素的MKID阵列。每组读出板能够读出在2 GHz带宽上复用的1024个MKID像素；两个这样的单元可以并行放置，以在4 GHz - 8 GHz频段读出完整的2048像素微波馈线。与第一代读出系统一样，我们的系统能够以几微秒量级的时间分辨率实时识别、分析和记录光子探测事件。在此，我们描述硬件和固件，并对系统的噪声特性进行分析。我们还提出了一种新颖的算法，可有效地将IQ混频器边带抑制到低于 -30 dBc。
