Radio front end with resonant transmit/receive switch

Details Radio front end with resonant transmit/receive switch Radio front end with resonant transmit/receive switch

2011-04-05

2011-04-05

Anderson, Matthew D (Department: 2618)

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

Reexamination Certificate

active

07920833

ABSTRACT:
A device having a radio front end is provided. The radio front end includes an inductor having a first end and a second end. A capacitor having a first end and a second end is connected to the second end of the inductor. An antenna is connected to the second end of the inductor and the second end of the capacitor. A first switch is connected to the first end of the inductor and the first end of the capacitor, wherein the inductor and capacitor form a resonant circuit when the first switch is closed. A second switch is connected to the resonant circuit, the second switch connecting the resonant circuit to ground through a low impedance when the first switch is closed. A third switch is connected to a transmit power amplifier connecting the transmit power amplifier to ground through a low impedance when the first switch is closed.

REFERENCES:
patent: 4577171 (1986-03-01), Heigl et al.
patent: 5697069 (1997-12-01), Boehm et al.
patent: 2005/0107043 (2005-05-01), Avasarala et al.
patent: 2004036788 (2004-04-01), None
J. Jeon and W.B. Kuhn, “A UHF CMOS Transceiver Front-end with Resonant TR Switch,” in Proc. IEEE Radio Wireless Symp, Jan. 2007, pp. 71-74.
Tokumitsu et al., “A Low-Voltage, High-Power T/R Switch MMIC Using LC Resonators,”IEEE Transactions on Microwave Theory and Techniques, vol. 43, No. 4, May 1995.
Kuhn et al., “A Resonant Switch for LNA Protection in Watt-Level CMOS Transceivers,”IEEE Transactions on Microwave Theory and Techniques, vol. 53, No. 9, Sep. 2005.
International Search report and Written Opinion for Corresponding PCT Application No. PCT/US2008/069609, mailed Jan. 26, 2001, Applicant: Axiom Microdevices, Inc., Jul. 10, 2008.

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