SFQ balanced comparators at a finite sampling rate

V. K. Semenov; T. V. Rlippov; Yu A. Polyakov; K. K. Likharev

doi:10.1109/77.622189

SFQ balanced comparators at a finite sampling rate

V. K. Semenov
, T. V. Rlippov
, Yu A. Polyakov
, K. K. Likharev

Physics and Astronomy

Stony Brook University

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

We have extended our previous study of SFQ balanced comparators which use two overdamped Josephson junctions to (a) finite sampling rate and (b) junctions with higher critical current density. The effective width AIX of the gray zone of the comparators fabricated using the niobium-trilayer technology of HYPRES Inc. (j_c-l kA/cm²) and Stony Brook's domestic planarized process (j_c-5 kA/cm²) has been measured as a function of the SFQ pulse rate (from 2.5 to 55 GHz) and temperature (from 1.6 to 4.2 K) for various drivers which determine the SFQ pulse shape and external impedance. The data have been compared with available theories of Josephson junction dynamics in the presence of thermal and quantum fluctuations. We have found that AI_X can be substantially reduced by using relatively broad ("soft") SFQ pulses. For high-y_c comparators fed by short (-2ps) SFQ pulses the temperature dependence is practically negligible indicating the dominance of quantum fluctuations.

Original language	English
Pages (from-to)	3617-3621
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	7
Issue number	2 PART 3
DOIs	https://doi.org/10.1109/77.622189
State	Published - 1997

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abstract = "We have extended our previous study of SFQ balanced comparators which use two overdamped Josephson junctions to (a) finite sampling rate and (b) junctions with higher critical current density. The effective width AIX of the gray zone of the comparators fabricated using the niobium-trilayer technology of HYPRES Inc. (jc-l kA/cm2) and Stony Brook's domestic planarized process (jc-5 kA/cm2) has been measured as a function of the SFQ pulse rate (from 2.5 to 55 GHz) and temperature (from 1.6 to 4.2 K) for various drivers which determine the SFQ pulse shape and external impedance. The data have been compared with available theories of Josephson junction dynamics in the presence of thermal and quantum fluctuations. We have found that AIX can be substantially reduced by using relatively broad ({"}soft{"}) SFQ pulses. For high-yc comparators fed by short (-2ps) SFQ pulses the temperature dependence is practically negligible indicating the dominance of quantum fluctuations.",

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T1 - SFQ balanced comparators at a finite sampling rate

AU - Semenov, V. K.

AU - Rlippov, T. V.

AU - Polyakov, Yu A.

AU - Likharev, K. K.

PY - 1997

Y1 - 1997

N2 - We have extended our previous study of SFQ balanced comparators which use two overdamped Josephson junctions to (a) finite sampling rate and (b) junctions with higher critical current density. The effective width AIX of the gray zone of the comparators fabricated using the niobium-trilayer technology of HYPRES Inc. (jc-l kA/cm2) and Stony Brook's domestic planarized process (jc-5 kA/cm2) has been measured as a function of the SFQ pulse rate (from 2.5 to 55 GHz) and temperature (from 1.6 to 4.2 K) for various drivers which determine the SFQ pulse shape and external impedance. The data have been compared with available theories of Josephson junction dynamics in the presence of thermal and quantum fluctuations. We have found that AIX can be substantially reduced by using relatively broad ("soft") SFQ pulses. For high-yc comparators fed by short (-2ps) SFQ pulses the temperature dependence is practically negligible indicating the dominance of quantum fluctuations.

AB - We have extended our previous study of SFQ balanced comparators which use two overdamped Josephson junctions to (a) finite sampling rate and (b) junctions with higher critical current density. The effective width AIX of the gray zone of the comparators fabricated using the niobium-trilayer technology of HYPRES Inc. (jc-l kA/cm2) and Stony Brook's domestic planarized process (jc-5 kA/cm2) has been measured as a function of the SFQ pulse rate (from 2.5 to 55 GHz) and temperature (from 1.6 to 4.2 K) for various drivers which determine the SFQ pulse shape and external impedance. The data have been compared with available theories of Josephson junction dynamics in the presence of thermal and quantum fluctuations. We have found that AIX can be substantially reduced by using relatively broad ("soft") SFQ pulses. For high-yc comparators fed by short (-2ps) SFQ pulses the temperature dependence is practically negligible indicating the dominance of quantum fluctuations.

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JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2 PART 3

ER -

SFQ balanced comparators at a finite sampling rate

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