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US 2002/0176375 A1Published application
Filtering method to allow FDD and TDD operations in PCS transreceivers
AssigneeIntel Corporation
InventorsDarrell W. Barabash, Russell A. Morris
Life of this patent
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Abstract
A transreceiver allows efficient operation in a full or half-duplex TDD or FDD system. The preferred transreceiver includes a common set of filters used for both FDD (Frequency Division Duplex) and TDD (Time Division Duplex) operation in a given range of frequencies thereby reducing circuitry count and implementation costs. Thus, the transreceiver of the present invention can operate in FDD operation or TDD operation.
Claims26
An apparatus, comprising:
- a first filter tuned to a first PCS band;
- a second filter to second PCS band;
- and
- a mode select switch to couple between said first filter and said second filter, the apparatus to operate in a first mode when said mode select switch is open, and the apparatus to operate in a second mode when said mode select switch is closed.
1 more element
An apparatus, comprising:
- a first filter tuned to a first PCS frequency band;
- a second filter tuned to a second PCS frequency band;
- a third filter tuned to a third frequency band;
- a first mode select switch disposed between said first filter and said third filter;
- and
- a second mode select switch disposed between said second filter and said third filter, the apparatus to operate in a first mode when said first mode switch and said second mode switch are open, and the apparatus to operate in a second mode when at least one of said first mode switch and said second mode switch is closed.
3 more elements
A method, comprising:
- operating an apparatus in a first mode when a first filter tuned to a first frequency band is uncoupled from a second filter tuned to a second frequency band;
- and
- operating the apparatus in a second mode when the first filter and the second filter are coupled.
Dependencies are inferred from the claim text.