System and method for filtering signals in a transceiver

Details System and method for filtering signals in a transceiver System and method for filtering signals in a transceiver

2006-02-21

2006-02-21

Nguyen, Lee (Department: 2682)

Telecommunications

Transmitter and receiver at same station

C455S078000, C333S103000

Reexamination Certificate

active

07003265

ABSTRACT:
A system and method for filtering signals in a communications system reduces hardware and chip size requirements by selectively connecting a filter along transmitter and receiver paths of a transceiver. In operation, a controller generated signals for connecting the filter along the transmitter path when the transceiver is in transmitter mode and for connecting the filter along the receiver path when the transmitter is in receiver mode. The controller then generates additional signals for setting one or more parameters of the filter based on the path connected, or put differently based on the operational mode of the transceiver. In a variation, the controller sets the parameters of additional elements coupled to the filter as a way of further controlling processing of the transmitter and receiver signals. The system and method are particularly well suited to controlling the filtering of signals at the front-end of the transceiver having a direct-conversion architecture and in general ones performing time-multiplexing applications.

REFERENCES:
patent: 5521561 (1996-05-01), Yrjola et al.
patent: 2003/0078011 (2003-04-01), Cheng et al.

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