| US 7,522,016 B2 | ||
| Tunable surface acoustic wave resonators | ||
| Stanley Slavko Toncich, San Diego, Calif. (US); Aracely Williams, San Diego, Calif. (US); Raymond C. Wallace, San Diego, Calif. (US); Soon-Seng Lau, San Diego, Calif. (US); and Steven C. Ciccarelli, Ramona, Calif. (US) | ||
| Assigned to QUALCOMM, Incorporated, San Diego, Calif. (US) | ||
| Filed on Sep. 14, 2005, as Appl. No. 11/227,632. | ||
| Claims priority of provisional application 60/610327, filed on Sep. 15, 2004. | ||
| Prior Publication US 2006/0109064 A1, May 25, 2006 | ||
| Int. Cl. H03H 9/72 (2006.01); H03H 9/64 (2006.01) | ||
| U.S. Cl. 333—133 [333/193] | 15 Claims |
| 2. A transceiver, comprising:
a receiver;
a transmitter; and
a duplexer coupled to the receiver and transmitter;
wherein the transmitter or receiver includes a tunable SAW resonator, the SAW resonator has a Q, the transmitter or receiver
further comprises a resistor coupled to the SAW resonator to reduce the Q, and a tuning component configured to tune the SAW
resonator, the tuning component and the SAW resonator are arranged to form a filter, the filter comprises a notch filter wherein
the notch filter is used in the receiver to vary the transmit signal rejection of the duplexer.
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