Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1997-10-23
2000-10-31
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
330260, G11B 502, H03F 345
Patent
active
061411698
ABSTRACT:
A system and method for an amplifier control circuit is provided which does not require the use of a large off-chip or on-chip capacitor for achieving a low frequency coupling corner, while still effectively allowing AC coupling the data detection circuit. In addition, the input offset voltage to the amplifier may be compensated and the inherent random low frequency input voltages provided to the amplifier may be controlled or canceled. Further, the amplifier control circuitry includes a freeze capability which allows the control circuitry to halt all updates to the input offset/low frequency control circuit when the voltage input signal is interrupted. In addition low frequency control and offset compensation updates may be performed without causing large output signal glitches so that the integrity of the received signal will not be compromised. In a preferred embodiment the system and method may be utilized for data detection circuits utilized in conjunction with optical disks.
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Bliss William G.
Feyh German S.
Hein Jerrell P.
Pietruszynski David M.
Cirrus Logic Inc.
Eagan Richard D.
Kim W. Chris
Shifrin Dan
Violette J. P.
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