Data processing: generic control systems or specific application – Generic control system – apparatus or process – Specific compensation or stabilization feature
Reexamination Certificate
1998-08-03
2001-05-22
Grant, William (Department: 2121)
Data processing: generic control systems or specific application
Generic control system, apparatus or process
Specific compensation or stabilization feature
C700S030000, C375S334000
Reexamination Certificate
active
06236898
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Application No. 37102/1997, filed Aug. 2, 1997, in the Korean Patent Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compensation circuit for parameter errors (or processing errors) of elements, which may be generated in the fabrication process of an integrated circuit (IC) chip, and in particular, to an error compensation circuit for compensating for a frequency error of a filter and a boosting error of a boost circuit in an equalizer IC chip for use in an optical disk player.
2. Description of the Related Art
An optical disk player such as a DVD (Digital Video Disk) player includes an equalizer filter for use in a read channel. As to the equalizer filter, it is necessary to reduce a permissible error of a frequency characteristic and a boosting gain, as much as possible. However, during the process of fabricating an IC chip including the equalizer filter, parameters of the elements such as resistors, capacitors and transistors may be deviated by over +/−20% from the designed parameters. As a result, in the worst case, the frequency characteristic and the boosting gain of the equalizer filter may greatly deviate from the designed values, exceeding the permissible error. Accordingly, prior to the shipment of the IC chip, it is necessary to detect parameter errors (i.e., processing errors) generated during the manufacturing process and compensate for the deviation (i.e., the parameter errors), so as to optimize the frequency characteristic and the boosting level.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an error compensation circuit capable of detecting parameter errors generated in the process of manufacturing an IC chip having a filter and a boost circuit and automatically compensating for deviation from designed parameters thereof.
It is another object of the present invention to provide an error compensation circuit for optimally maintaining a frequency characteristic and a boost level of an IC chip having an equalizer filter for use in a read channel of an optical disk player.
To achieve the above and other objects of the present invention, there is provided an error compensation circuit for compensating for a frequency error and a boost error of an IC chip having a filter and a boost circuit. The error compensation circuit includes a frequency compensation circuit, a boost compensation circuit, and a switch being switchable to a first reference signal in an error compensation mode and to an input signal in a normal signal processing mode. The frequency compensation circuit includes a first level detector to detect a level of a signal output from the filter; a first level comparator to compare an output level of the first level detector with a second reference signal level; a first integrator to integrate an output of the first level comparator to generate a frequency error signal; and a first data converter and storage and to convert the frequency error signal into digital data, store the digital data, convert the stored digital data into an analog frequency compensation signal in the normal signal processing mode, and provide the frequency compensation signal to the filter. The boost compensation circuit includes a second level detector to detect a level of a signal output from the boost circuit; a second level comparator to compare an output level of the second level detector with the second reference signal level, a second integrator to integrate an output of the second level comparator to generate a boost error signal; and a second data converter and storage to convert the boost error signal into digital data, store the digital data, convert the stored digital data into an analog boost compensation signal in the normal signal processing mode, and provide the boost compensation signal to the boost circuit.
REFERENCES:
patent: 3959770 (1976-05-01), Schaefer
patent: 4457471 (1984-07-01), Herwig
patent: 4490688 (1984-12-01), Borras et al.
patent: 4924226 (1990-05-01), Adams
patent: 5732111 (1998-03-01), Walley
patent: 5781588 (1998-07-01), Abe et al.
patent: 6023491 (2000-02-01), Saka et al.
patent: 6067332 (2000-05-01), Taura et al.
Bahta Kidest
Grant William
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
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