A Low-Power Write Driver for Hard Disk Drives

Tatsuya KAWASHIMO  Hiroki YAMASHITA  Masayoshi YAGYU  Fumio YUKI  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.11   pp.1670-1673
Publication Date: 2006/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.11.1670
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Novel Device Architectures and System Integration Technologies)
write driver,  preamplifier,  MOS transistor,  reflection cancellation,  

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This paper describes a new low-power write driver circuit for mobile hard disk drive preamplifiers. To achieve low power consumption, we developed a write driver circuit with a single-stage MOS transistor as the current driver, which both switches and controls the write current. We also developed a reflection cancellation method to suppress the distortion of the write current waveform during write transition. Fabricated using 0.35-µm SOI-BiCMOS technology, this write driver circuit consumes low power, 380 mW (at 100 MHz).