Direct synthesis transmitter

Details Direct synthesis transmitter Direct synthesis transmitter

2006-01-10

2006-01-10

Vo, Nguyen T. (Department: 2685)

Telecommunications

Transmitter

Amplitude modulation

C455S113000, C332S145000

Reexamination Certificate

active

06985703

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.

REFERENCES:
patent: 5991605 (1999-11-01), Rapeli
patent: 2002/0071497 (2002-06-01), Bengtsson et al.
patent: 2003/0118143 (2003-06-01), Bellaouar et al.

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