Transmitter and radio communication terminal using the same
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United States of America Patent
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Issued Date -
Mar 30, 2006
app pub date -
Aug 25, 2005
filing date -
Aug 26, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A radio communication terminal is provided, in which the noise reduction and the cost reduction of a dual-mode transmitter handling two types of modulation systems of a non-constant amplitude modulation and a constant amplitude modulation can be realized. By applying a phase synchronization loop to the output signal of an orthogonal modulator and a synchronization loop to an envelope, a low-noise transmitter adapted to the constant amplitude modulation and the non-constant amplitude modulation is realized. Moreover, by preparing a variable gain amplifier for realizing the envelope modulation and a variable gain amplifier for realizing the output power control of a power amplifier, it becomes possible to use a general purpose PA with a fixed gain, and therefore, the cost reduction of the radio communication terminal can be achieved.
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