Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
September 22, 2009
Patent Application Number
10598695
Date Filed
March 9, 2005
Patent Primary Examiner
Patent abstract
A transmission device having a preferable power efficiency and a wide control range of transmission output power. A pre-stage side of a high-frequency power amplifier changes an amplitude of a high-frequency phase modulation signal according to a base band amplitude modulation signal and a gain control signal. A variable gain amplifier changes the amplitude of the high-frequency phase modulation signal according to the base band amplitude modulation signal and the gain control signal, so that the base band amplitude modulation signal is supplied to an amplifier via a linear-log converter.
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