Low Power Current-Cut Switched-Current Matched Filter for CDMA

Kenji TOGURA  Hiroyuki NAKASE  Koji KUBOTA  Kazuya MASU  Kazuo TSUBOUCHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.2   pp.212-219
Publication Date: 2001/02/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Low-Power High-Performance VLSI Processors and Technologies)
Category: 
Keyword: 
switched-current (SI) circuit,  matched filter,  code division multiple access (CDMA),  current-cut,  

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Summary: 
We have proposed a current-cut switched-current matched filter (CC-SIMF) for direct-sequence code-division multiple-access (DS-CDMA). The 256-chip CC-SIMF can achieve low power consumption of less than 10 mW under high-speed operation of more than 16 Mcps. To reduce the current transfer error accumulation, we propose a parallel SIMF configuration. A 128-chip SIMF using 0.8-µm Complementally Metal Oxide Semiconductor (CMOS) process has been designed and fabricated. Optimization of the current memory cell structure has been described. The correlation operation at 16 Mcps has been obtained using a 128-chip orthogonal m-sequence. The code phase separation performance for path diversity has been clearly observed. The power consumption has been significantly reduced using the current-cut method.