RSFQ asynchronous serial multiplier and spreading codes generator for multiuser detector

Author

Kidiyarova-Shevchenko, Anna Yu ; Platov, Konstantin Yu ; Tolkacheva, Elena M. ; Kataeva, Irina A.

Author_Institution

Microelectron. & Nanoscience Dept., Chalmers Univ. of Technol., Gothenburg, Sweden

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

429

Lastpage

432

Abstract

Serial multiplier and serial spreading code generators are vital elements of the RSFQ multiuser detector. We have designed different versions of both circuits to achieve maximum speed and at the same time minimize Josephson junction count. Comparison of different serial multipliers architectures supporting signed multiplication favored for asynchronous shifting over zero circuits based on carry save adder and co-flow distribution of the partial product and the clock. A 25-bit spreading code generator supporting parallel input/output has been designed for 4 kA/cm² (TRW) and for 1 kA/cm² (HYPRES) processes. The corresponding maximum simulated clock speed of 52 GHz and 26 GHz and effective device area of 1×0.12 mm² and 1.9×0.2 mm².

Keywords

adders; asynchronous circuits; code division multiple access; multiplying circuits; multiuser detection; signal generators; spread spectrum communication; superconducting logic circuits; 25 bit; 26 GHz; 52 GHz; HYPRES processes; Josephson junction count minimization; RSFQ asynchronous serial multiplier; RSFQ multiuser detector; RSFQ spreading code generator; asynchronous shifting; parallel input/output; pseudo-noise generator; serial spreading code generator; signed multiplication; Adders; Base stations; Circuit simulation; Clocks; Delay estimation; Detectors; Hardware; Interference; Josephson junctions; Silicon carbide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.813889

Filename

1211633