Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-08-25
2011-11-22
Huber, Paul (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053280
Reexamination Certificate
active
08064300
ABSTRACT:
In order to cancel an offset caused by a variation of a signal inputted from an optical pickup, variations of elements in an integrated circuit, etc., a calibration circuit which generates and feeds back an offset adjustment amount that makes the offset zero by a comparison with a reference value, and an offset adjustment circuit that makes the offset zero using the fed-back control signal are provided in an analog front-end LSI. The offset adjustment by the calibration circuit is automatically done in response to commands supplied from a digital signal processing LSI, a host control device, etc. On the other hand, as for a signal on which arithmetic processing such as gain control, addition and subtraction, is performed, the offset adjustment is performed by sending the offset adjustment amount obtained by an arithmetic operation performed by software processing of the digital signal processing LSI to the analog front-end.
REFERENCES:
patent: 2004/0252599 (2004-12-01), Sasaki et al.
patent: 2005/0063287 (2005-03-01), Suzuki et al.
patent: 2004-348843 (2004-12-01), None
patent: 2005-92999 (2005-04-01), None
Abe Hiroshi
Umeyama Takehiko
Huber Paul
Mattingly & Malur, PC
Renesas Electronics Corporation
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