Superconducting single flux quantum 20 Gb/s clock recovery circuit
作者:
V. Kaplunenko,
V. Borzenets,
N. Dubash,
T. Van Duzer,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 71,
issue 1
页码: 128-130
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119449
出版商: AIP
数据来源: AIP
摘要:
A clock recovery circuit has been successfully tested at frequencies up to 20 GHz. This cell is designed for a rapid-single-flux-quantum (RSFQ) telecommunication data switch. It serves to set the receiver clock in phase with the incoming digital signal. The circuit consists of a dc-to-SFQ converter, ring oscillator [(RO) is a closed-loop RSFQ Josephson transmission line], confluence buffer, and an 8-bit binary counter. The input signal transforms to SFQ pulses, and each pulse resets the phase of the ring oscillator, giving a locking time of 1 bit. Thus, the pull-in (capture) range and hold-in (tracking) range are the same, and strictly depend on the encoding of the input signal. This range is estimated to be about 1 GHz at frequency 20 GHz, if the sequence of consecutive ONEs or ZEROs does not exceed 20 bits. The quality factorQROof ring oscillator is about 2000, which gives a jitter of 50 fs for a 35-junction RO. A sampling technique was used to demonstrate phase recovery (phase locking) with only one incoming pulse per 512 clock periods. ©1997 American Institute of Physics.
点击下载:
PDF
(75KB)
返 回