Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-02-08
2005-02-08
Shingleton, Michael B (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S258000, C330S305000
Reexamination Certificate
active
06853249
ABSTRACT:
A method and apparatus for calibrating a Gm cell using a Gm replica cell. A digital to analog converter receives a Gm setting code and generates a reference current. The Gm replica cell adjusts the tuning voltage until the difference between a pair of drain currents is substantially equal to the reference current. Where this condition is satisfied, the proper tuning voltage has been acquired. This results in proper calibration for the tuning voltage, which then may be utilized by a Gm cell connected with the Gm replica cell.
REFERENCES:
patent: 4833422 (1989-05-01), Atwell
patent: 5384501 (1995-01-01), Koyama et al.
patent: 5612648 (1997-03-01), McClellan et al.
patent: 6271688 (2001-08-01), Marchese et al.
patent: 6480064 (2002-11-01), Cyrusian
patent: 6737919 (2004-05-01), Cyrusian
patent: 101174 (1984-02-01), None
patent: 0 308 000 (1988-09-01), None
patent: 0 695 030 (1996-01-01), None
patent: 1 020 990 (2000-07-01), None
patent: WO 9742704 (1997-11-01), None
Hashimi et al. “New Duel Output Transconductance Amplifier Based Biquad” IEEE International Symposium on Connecting the World vol. 1 May 12-15, 1996 pp 274-276.*
“An Analog Front-End Signal Processor for a 64 Mbits/s PRML Hard-Disk Drive Channel,” IEEE Journal of Solid-State Circuits, 29, 1994, Dec., No. 12.
“Synchronous Recording Channels—PRML & Beyond,” rev. 5.61 14.E.18, 1999, published by Knowledge Tek, Inc., Broomfield, Colorado.
“PRML: Seagate Uses Space Age Technology” available on the Internet at http://www.seagate.com/support/kb/disc/prml.html, 2 pages, last accessed Apr. 9, 2001.
“Technologies—PRML” available on the Internet at http://www.idema.org/about/industry/ind_tech_prml.html, 1 page, last accessed Apr. 9, 2001.
“Reference Guide—Hard Disk Drives” available on the Internet at http://www.storagereview.com/guide2000/ref/hdd, 13 pages, last accessed Apr. 9, 2001.
“MR and PRML: Technologies in Synergy” available on the Internet at http://www.lionsgate.com/Home/Baden/public_html_index/SCSI/Quantum_White_Papers/MR_Head/MR, 4 pages, last accessed Apr. 9, 2001.
“A Tutorial on Convolutional Coding with Viterbi Decoding” available on the Internet at http://pw1.netcom.com/˜chip.f/viterbi/tutorial.html, 10 pages, last accessed Apr. 9, 2001.
“A Linear Operational Transconductance Amplifier for Instrumentation Applications,” Chung et al., IEEE Transactions on Instrumentation and Measurement, vol. 41, Issue 3, Jun. 1992, pp. 441-443.
Brinks Hofer Gilson & Lione
Infineon - Technologies AG
Shingleton Michael B
LandOfFree
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