Second-order lowpass sigma-delta modulator with parallel multiple-flux-quantum feedback driver

被引：4
|
作者：
Hirano, S [1 ]
Hasegawa, H [1 ]
Nagasawa, S [1 ]
Miyahara, K [1 ]
Enomoto, Y [1 ]
Tanabe, K [1 ]
机构：
[1] Int Superconduct Technol Ctr, Superconduct Res Lab, Div 7, Koto Ku, Tokyo 1350062, Japan
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2003年 / 392卷
关键词：
analog-to-digital converter; Josephson devices; single flux quantum; sigma-delta modulator;
D O I：
10.1016/S0921-4534(03)00851-7
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have made a prototype superconducting double-loop lowpass sigma-delta modulator with a parallel multiple-flux-quantum feedback driver. The feedback driver consists of multi-stage SFQ splitters and SQUID-gates connected in series. The multi-stage splitters forming a binary-tree structure produce multiple numbers of flux quanta for the feedback gain and switching of the SQUID-gates gives feedback to the first integrator. A simulation showed that the feedback duration of the SQUID-gate type was only 20 ps, whereas our earlier type with a ladder circuit of gain 20 requires 526 ps. This reduction of the feedback duration enables much higher speed operation. The fabricated modulator with SQUID-gates was operated at the sampling frequency of 1.2 GHz and showed noise shaping roughly of the second-order. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：1456 / 1460
页数：5
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