Sub-band duplexer with active frequency tuning
AssigneeRF Micro Devices, Inc.
InventorsJoshua J. Caron, Julio Costa, Todd Gillenwater
Life of this patent
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Abstract
Embodiments disclosed herein relate to programmable duplexers. The frequency pass band of the programmable duplexer is changed according to a selection of a channel-pair selection to control or maximize the transition band between the receiver path and the transmitter path. The programmable duplexer permits selections of desired pass bands without the need for multiple duplexer filters. As an additional advantage, the transmission band requirements become less sensitive to manufacturing tolerances and temperature variations.
Claims17
A duplexer for a communication device comprising:
- a receiver path including a programmable receiver filter that provides a programmable receiver pass band;
- a transmitter path including a programmable transmitter filter that provides a programmable transmitter pass band, wherein the programmable receiver filter is separated from the programmable transmitter filter by a transition band, wherein the programmable receiver pass band has an edge adjacent to the transition band, and the programmable transmitter pass band has an edge adjacent to the transition band;
- and
- a controller configured to identify a channel pair selection provided for communication between the communication device and a base station, the controller further configured to adjust at least one of the edge of the programmable transmitter pass band, the edge of the programmable receiver pass band, and a combination thereof based upon the channel pair selection.
A programmable duplexer of a communication device comprising:
- a receiver filter including a receiver input and a receiver output, the receiver filter having a programmable receiver pass band;
- a transmitter filter including a transmitter input and a transmitter output, wherein the transmitter output is coupled to the receiver input, and wherein the transmitter filter has a programmable transmitter pass band;
- and
- a controller coupled to the receiver filter and the transmitter filter, the controller adapted to:
- identify a receiver-transmitter channel pair provided for communication between a mobile terminal and a base station;
- and
- adjust at least one of the programmable receiver pass band, the programmable transmitter pass band, and a combination thereof, to maintain at least a minimum transition band between the programmable receiver pass band and the programmable transmitter pass band based upon the receiver-transmitter channel pair.
A duplexer comprising:
- a receiver filter including a radio frequency receiver input and a radio frequency receiver output, wherein the receiver filter includes a receiver pass band having a programmable receiver pass band edge;
- a transmitter filter including a radio frequency transmitter input and a radio frequency transmitter output, wherein the radio frequency transmitter output is coupled to the radio frequency receiver input, and wherein the transmitter filter includes a transmitter pass band having a programmable transmitter pass band edge;
- and
- a controller coupled to the receiver filter and the transmitter filter, wherein the controller is configured to adjust at least one of the programmable receiver pass band edge and the programmable transmitter pass band edge based upon selection of a channel pair of a transmit frequency band and a receiver frequency band.
Dependencies are inferred from the claim text.