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Construction of an RSFQ 4-Bit ALU With Half Adder Cells.
- Source :
-
IEEE Transactions on Applied Superconductivity . Jun2005 Part 1 of 3, Vol. 15 Issue 2, p308-311. 4p. - Publication Year :
- 2005
-
Abstract
- As part of the effort to develop a superconductive microprocessor, we constructed a rapid single flux quantum (RSFQ) 4-bit arithmetic and logic unit (ALU) in a pipelined structure. To speed up the circuit, we used a forward clocking scheme. The 4-bit ALU consisted of ten RSFQ Half Adders, four 2 × 2 switches, and several D flip-flops. By commutating output ports of the half adder, we were able to produce AND, OR, XOR, and ADD functions. The 4-bit ALU was fabricated using., the Korea Photonics Technology Institute's ten-level 1.0 kA/cm² Nb process. The size of the ALU was 3.0 mm × 1.5 mm, fitting in a 5 mm × 5 mm chip. The fabricated 1-bit ALU block was successfully tested at up to a 40 GHz clock frequency. The complete 4-bit ALU operated correctly at up to a 5 GHz clock frequency. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10518223
- Volume :
- 15
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Applied Superconductivity
- Publication Type :
- Academic Journal
- Accession number :
- 17399720
- Full Text :
- https://doi.org/10.1109/TASC.2005.849810