BBTRX : A BASEBAND TRANCEIVER FOR A ZERO IF GSM HAND PORTABLE STATION
Alcatel Bell · 1992
The BBTRX ( base band transmission and reception ) is a multi functional, CMOS, mixed analog/digitalVLSI circuit conceived to support the different ASIC's on the radio sub-assembly in the interfaces the zero IF 900 MHz RF quadrature modulator/demodulator chip and the base band GMSK modulator/demodulator circuits as well as the synthesizer and control unit. The BBTRX also controls the TX RF power amplifier output level and the burst shaping. base band transceiver is a mixed analog - digital design, developed in a 1.2 um analog cmos technology with a 38 mm2 die area. GSM handportable terminal. It