Superconducting second-order sigma-delta modulators utilizing multi-flux-quantum generators

被引：10
|
作者：
Hashimoto, T [1 ]
Hasegawa, H [1 ]
Nagasawa, S [1 ]
Suzuki, H [1 ]
Miyahara, K [1 ]
Enomoto, Y [1 ]
机构：
[1] Int Superconduct Technol Ctr, Superconduct Res Lab, Inzai 2701382, Japan
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2001年 / 11卷 / 01期
关键词：
A/D converter; Josephson devices; rapid single flux quantum circuit; sigma-delta modulator;
D O I：
10.1109/77.919405
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We have been developing a superconducting second-order sigma-delta analog-to-digital converter with a large bandwidth and a large dynamic range for software radio applications. In a superconducting second-order sigma-delta modulator utilizing a passive integrator and single-flux-quantum (SFQ) feedback, gain to compensate the large attenuation in the passive integrator of the modulator is required to obtain a large dynamic range, In this paper, a second-order modulator utilizing multi-flux-quantum (MFQ) generators creating the needed gain is reported and the design and experimental test results of the elementary circuits including a comparator, a first-order modulator, and the MFQ generator are described, The digital outputs of the comparator and the first-order modulator were experimentally evaluated, where the input dependence of the comparator switching probability and the noise-shaping properties of the modulator were clearly observed. The low speed operation of the MFQ generator creating three SFQ pulses was experimentally confirmed, The other circuits were also tested at low frequencies.
引用
收藏
页码：554 / 557
页数：4
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