Bjoern Jelonnek

Solutions for highly integrated future generation software radio basestation transceivers

This paper discusses transceiver technologies for future mobile radio basestations. Software radio technology places demanding requirements on both bandwidth and dynamic range of the transceiver technology, especially on the data converters. These requirements and a number of solution options are presented. Delta-sigma principles are favored to overcome bandwidth limitation. Recent progress in digital-to-analog converters is reported in which a multi-carrier CDMA signal can be directly converted to RF with sufficient dynamic range for 3/sup rd/ generation mobile communications systems.

SiGe BiCMOS broadband phase-aligner circuit from 1 Gb/s to 11 Gb/s

The circuit is implemented as the interface between two BiCMOS chips for the TX frontend in second- and third-generation basestations. No clock recovery is necessary in these applications. The first chip translates the incoming IQ-data stream from the baseband into a serial output data stream with a bit rate up to 8.5Gb/s for CDMA-, GSM- and EDGE applications in the 2GHz range. This data stream already contains the antenna signal. To achieve this functionality, the first chip includes digital filters, interpolating stages and a /spl Sigma//spl Delta/ modulator. The second chip with input stage consisting of the presented phase-aligner circuit is a digital to analog converter (DAC).