| US 7,519,390 B2 | ||
| Transmitter and receiver architecture for multi-mode wireless device | ||
| Lawrence Jarrett Malone, Carlsbad, Calif. (US); and Lon Christensen, San Diego, Calif. (US) | ||
| Assigned to Spreadtrum Communications Inc., Grand Cayman (Cayman Islands) | ||
| Filed on Mar. 10, 2005, as Appl. No. 11/77,698. | ||
| Claims priority of provisional application 60/551344, filed on Mar. 10, 2004. | ||
| Prior Publication US 2006/0084469 A1, Apr. 20, 2006 | ||
| Int. Cl. H04M 1/00 (2006.01) | ||
| U.S. Cl. 455—552.1 [455/78; 455/88; 455/553.1] | 28 Claims |
| 1. A multi-mode wireless communication device capable of concurrent wireless communications with a plurality of wireless communication
systems, the device comprising:
a multi-mode transceiver having a single transmit signal path and a single receive signal path; and
a multi-mode baseband portion configured to configure an operating mode of the multi-mode transceiver in a time multiplex
manner to each of the plurality of wireless communication systems to permit the concurrent wireless communications with the
plurality of wireless communication systems, wherein the multi-mode transceiver comprises:
a local oscillator (LO) having a programmable frequency that can be tuned to frequencies spanning at least transmit and receive
operating bands corresponding to the plurality of wireless communication systems;
a transmitter configured to receive a baseband transmit signal from the multi-mode baseband portion and frequency convert
the baseband transmit signal, using the LO, to an RF transmit frequency in any one of the transmit operating bands of the
plurality of wireless communication systems; and
a receiver configured to receive RF signals from any one of the receive operating bands and frequency convert the RF signals,
using the LO, to a baseband receive signal.
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