Circuit system for wireless communications

Details Circuit system for wireless communications Circuit system for wireless communications

2006-12-26

2006-12-26

Nguyen, Tony T. (Department: 2618)

Telecommunications

Transmitter

Diversity

C455S073000, C455S095000, C455S168100, C379S429000

Reexamination Certificate

active

07155178

ABSTRACT:
A circuit system for wireless communications via two antennas. The circuit system includes a printed circuit board having a predetermined area devoid of a solder mask. According to the invention, an antenna switch, filter, and power amplifier are mounted on the printed circuit board within the predetermined area. The antenna switch connects the filter and the power amplifier with the two antennas. The filter blocks unwanted frequency components in an RF receive signal from either of the antennas. A transceiver is responsible for down-converting the RF receive signal a baseband receive signal and up-converting a baseband transmit signal to an RF transmit signal. A first matching network coupled between the filter and the transceiver transforms the RF receive signal from single-ended to differential. Likewise, a second matching network coupled between the transceiver and the power amplifier transforms the RF transmit signal from differential to single-ended.

REFERENCES:
patent: 5715525 (1998-02-01), Tarusawa et al.
patent: 6075995 (2000-06-01), Jensen
patent: 6560448 (2003-05-01), Baldwin et al.
patent: 6735422 (2004-05-01), Baldwin et al.
patent: 6876836 (2005-04-01), Lin et al.
patent: 2004/0018814 (2004-01-01), Lin et al.

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