Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2005-02-01
2005-02-01
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S066000, C360S067000, C327S055000, C330S127000, C330S252000
Reexamination Certificate
active
06850378
ABSTRACT:
A method and apparatus for providing quadrature biasing for coupled-pair circuits. A QBCP-circuit for quadrature amplifiers provides a new input common-mode sense point that separates the inputs for the differential-and-common mode feedback-control loops. The QBCP circuit biases all four transistors equivalently and reduces the feedback-loop interaction, thereby simplifying the bias control system and improves the voltage-transfer frequency-response performance.
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Chung Paul Wingshing
Conteras John Thomas
Jove Stephen Alan
Vannorsdel Kevin Roy
Crawford & Maunu PLLC
Faber Alan T.
Hitachi Global Storage Technologies Netherlands BV
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