Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2007-06-12
2007-06-12
Trinh, Sonny (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S234100, C455S253200
Reexamination Certificate
active
10939472
ABSTRACT:
Disclosed is a variable gain control circuit for executing automatic-gain-control on a variable gain amplification block composed of a plurality of amplifiers on which discrete gain setting is executed by a programmable-gain-amp method. A baseband amplifier (a variable gain amplifier) is composed of a plurality of amplifiers on which discrete gain setting is executed by a programmable-gain-amp method. A programmable-gain-amp control processing block references a programmable-gain-amp control data table on the basis of a difference between a current receive signal level and a predetermined receive signal level to determine the gain of the baseband amplifier, thereby making a programmable-gain-amp data generator generate programmable-gain-amp data. A programmable-gain-amp control processing block references a direct-current offset cancel table on the basis of current programmable-gain-amp data and next programmable-gain-amp data to generate corresponding direct-current offset cancel data, converts the generated direct-current offset cancel data into an analog voltage, and adds the analog voltage to the baseband amplifier output.
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Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Ericsson Mobile Communications Japan Inc.
Trinh Sonny
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