RSFQ arithmetic blocks for DSP applications

Author

Polonsky, S.V. ; Jao Ching Lin ; Rylyakov, A.V.

Author_Institution

Dept. of Phys., State Univ. of New York, Stony Brook, NY, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2823

Lastpage

2826

Abstract

We have designed a Rapid Single-Flux-Quantum (RSFQ) bit-serial real-time pipeline multiplier for digital signal processing (DSP) applications. A single-bit module of this multiplier consists of 96 Josephson junctions and uses a B-flip-flop-based carry-save adder (CSA). For HYPRES´ standard 1-kA/cm/sup 2/ Nb process with 3.5 /spl mu/m-diameter Josephson junctions the module occupies all area of 350/spl times/600 /spl mu/m/sup 2/. Simulations show that the circuit should dissipate 28 /spl mu/W of power at 2.6 mV dc supply voltage and operate at frequencies of up to 25 GHz. We have successfully tested all cells of the module and verified correct operation of a simplified version of the module at low frequencies. According to numerical simulations, the speed of the multiplier is limited by the CSA. In order to overcome this bottleneck we have developed a concept of a fast carry-save pipeline adder based on XOR gates which uses an RSFQ-specific algorithm for carry bit calculation.<>

Keywords

Josephson effect; adders; carry logic; digital signal processing chips; flip-flops; multiplying circuits; niobium; pipeline arithmetic; superconducting processor circuits; type II superconductors; 2.6 mV; 25 GHz; 28 muW; 3.5 micron; B-flip-flop-based carry-save adder; DSP applications; Josephson junctions; Nb; RSFQ arithmetic blocks; XOR gates; bit-serial real-time pipeline multiplier; carry bit calculation; rapid single-flux-quantum; single-bit module; Adders; Arithmetic; Circuit simulation; Digital signal processing; Frequency; Josephson junctions; Niobium; Pipelines; Signal design; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403179

Filename

403179