Automatic gain control circuit

1. Field of the Invention In a state where a PLL circuit is not locked, a gain control signal according to the difference between a peak value of a reproduced signal and the upper or lower limit value of the dynamic range of an A/D converter is given to a variable gain amplifier. In a state where th...

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Main Authors Kawabe, Akira, Okamoto, Kouji
Format Patent
LanguageEnglish
Published 19.08.2003
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Abstract 1. Field of the Invention In a state where a PLL circuit is not locked, a gain control signal according to the difference between a peak value of a reproduced signal and the upper or lower limit value of the dynamic range of an A/D converter is given to a variable gain amplifier. In a state where the PLL circuit is locked, a gain control signal according to the difference between the reproduced signal and a reference value that corresponds to a level to which the reproduced signal belongs is given to the variable gain amplifier for each sampling point of the A/D converter. The variable gain amplifier amplifies the reproduced signal with a gain according to the gain control signal.
AbstractList 1. Field of the Invention In a state where a PLL circuit is not locked, a gain control signal according to the difference between a peak value of a reproduced signal and the upper or lower limit value of the dynamic range of an A/D converter is given to a variable gain amplifier. In a state where the PLL circuit is locked, a gain control signal according to the difference between the reproduced signal and a reference value that corresponds to a level to which the reproduced signal belongs is given to the variable gain amplifier for each sampling point of the A/D converter. The variable gain amplifier amplifies the reproduced signal with a gain according to the gain control signal.
Author Kawabe, Akira
Okamoto, Kouji
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References Matsumoto et al. (4673970) 19870600
Chambers et al. (5901347) 19990500
Tuttle et al. (5796535) 19980800
Young (4665402) 19870500
Kovacs et al. (5422601) 19950600
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Snippet 1. Field of the Invention In a state where a PLL circuit is not locked, a gain control signal according to the difference between a peak value of a reproduced...
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Title Automatic gain control circuit
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