Wireless transmitter incorporating a synchronous oscillator...

Details Wireless transmitter incorporating a synchronous oscillator... Wireless transmitter incorporating a synchronous oscillator...

2005-11-01

2005-11-01

Milord, Marceau (Department: 2682)

Telecommunications

Transmitter

Frequency conversion

C455S076000, C455S086000, C455S106000, C455S075000, C455S110000, C455S102000, C455S126000, C455S180300, C455S260000, C332S103000, C332S119000, C330S149000, C330S010000, C375S216000, C375S261000, C375S224000, C375S296000

Reexamination Certificate

active

06961547

ABSTRACT:
A translation loop signal upconverter is disclosed. Embodiments of the invention minimize nthorder harmonics and spurious tones in the radio frequency output spectrum of a portable transceiver. In one embodiment, the invention is a signal upconverter, comprising a modulator configured to develop a modulated intermediate frequency (IF) signal at a fundamental frequency, the modulated IF signal also including a plurality of nthorder components, a synchronous oscillator configured to receive the modulated IF signal, the synchronous oscillator also configured to operate at the fundamental frequency of the modulated IF signal, thereby providing an IF signal substantially free of the nthorder components, and a translation loop having a phase locked loop, the translation loop configured to receive the IF signal output of the synchronous oscillator, and supply a radio frequency (RF) output signal to a power amplifier.

REFERENCES:
patent: 6526265 (2003-02-01), Damgaard et al.
patent: 6529712 (2003-03-01), Domino et al.
patent: 6560297 (2003-05-01), Broughton
patent: 6650875 (2003-11-01), Rozenblit et al.
patent: 6658065 (2003-12-01), Delta Torre et al.
patent: 6658237 (2003-12-01), Rozenblit et al.
patent: 6671500 (2003-12-01), Damgaard et al.
patent: 6731693 (2004-05-01), Damgaard

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