Single-chip multiband WCDMA/HSDPA/HSUPA/EGPRS transceiver with diversity receiver and 3G DigRF interface without SAW filters in transmitter / 3G receiver paths
Tirdad Sowlati, BIPUL AGARWAL, J. Cho, T. Obkircher, M. El Said, J. Vasa, B. Ramachandran, Masoud Kahrizi, Elias H. Dagher, Weihong Chen, M. Vadkerti, Georgi Taskov, U. Seckin, H. Firouzkouhi, Behzad Saeidi, Hasan Akyol, Yun‐Young Choi, A. Mahjoob, S. D'Souza, Chieh-Yu Hsieh · 2009
There has been an increased demand for 3G cell phones that support multiple bands of operation and are backward compatible with the 2G/2.5G standard to provide coverage where 3G networks have not yet been fully deployed. The transceiver design for such a handset becomes complicated with the need for separate transceivers for 3G and 2G/2.5G or for multiple inter-stage receive / transmit SAW filters. A single-chip transceiver that operates as a multimode multiband radio and eliminates the inter-stage receive/transmit SAW filters is presented. The transceiver has 7 primary and 4 diversity bands in WCDMA, and quad band in GSM. The transceiver is designed to operate in any of the UTRA bands 1 to 10, with the exception of band 7. It supports HSDPA (Cat 1-12), HSUPA (Cat 1-6), EGPRS (Classes 1-12, 30-39), and compressed mode of EGPRS / WCDMA operation. The transceiver is compliant with 3G DigRF interface 3.09.