Transceiver Macro with Spread-Spectrum Clocking Capability for AC-Coupled Cable Interfaces

Takefumi YOSHIKAWA  Yoshihide KOMATSU  Tsuyoshi EBUCHI  Takashi HIRATA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.9   pp.1444-1452
Publication Date: 2008/09/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.9.1444
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced Processors Based on Novel Concepts in Computation)
Category: 
Keyword: 
interface,  spread-spectrum clocking,  AC coupling,  

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Summary: 
A transceiver macro for high-speed data transmission via cable in vehicles is proposed. The transceiver uses ac coupling and bi-directional interface topology for protecting LSIs against unexpected short of cable and harness/chassis and has a spread-spectrum-clocking (SSC) generator that reduces noise due to electromagnetic interference. A driver current control has been used for fast switching of data direction on ac-coupled interfaces. An adaptive bandwidth control has been used in a Δ ∑ PLL to improve SCC significantly. A test chip has been fabricated and shows stable and bi-directional data communication with data rate of 162 to 972 Mbps through 20-m cable. Thanks to an optimum calibration of the SSC-PLL bandwidth, it reduces peak power at 33 kHz by -23 dB and provides 2% modulation at a data rate of 810 Mbps.