Direct synthesis transmitter
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United States of America Patent
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Jan 10, 2006
Grant Date -
Apr 24, 2003
app pub date -
Oct 4, 2002
filing date -
Oct 4, 2001
priority date (Note) -
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Abstract
A direct synthesis transmitter. A very efficient and highly linear direct synthesis transmitter is provided that can be used to directly synthesize and transmit any type of modulated signal. The direct synthesis transmitter includes a phase-locked loop (PLL) with controls phase modulation plus an accompanying variable gain amplifier for amplitude modulation. Also included is a system to align the phase and amplitude modulation signals. A transmitter constructed in accordance with the present invention is very efficient and suitable for use in portable radio equipment.
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