Title :
A bipolar IF device for GSM mobile telephone
Author :
Kwan, K.W. ; Marshall, K.
Author_Institution :
Orbitel Mobile Commun. Ltd., Basingstoke, UK
Abstract :
The authors describe an IF device used in a telephone handset for the European GSM cellular network. It carries out frequency down-conversion from 65.8 MHz to the 812.5-kHz baseband signal. It has a maximum system gain of 90 dB and a dynamic range of 56 dB. A system noise figure of 7-8 dB was achieved at maximum gain setting. Output was maintained within the midrange of analog-to-digital-converter (ADC) input levels by employing a digital baseband automatic gain control (AGC) technique
Keywords :
analogue processing circuits; automatic gain control; bipolar integrated circuits; frequency convertors; linear integrated circuits; mobile radio systems; radiotelephony; 65.8 MHz; 7 to 8 dB; 812.5 kHz; 90 dB; AGC; European GSM cellular network; GSM mobile telephone; bipolar IF device; digital baseband automatic gain control; frequency down-conversion; telephone handset; Base stations; Dynamic range; Frequency; GSM; Noise figure; RF signals; Radio spectrum management; Switches; Telephony; Voltage;
Conference_Titel :
Bipolar/BiCMOS Circuits and Technology Meeting, 1992., Proceedings of the 1992
Conference_Location :
Minneapolis, MN
Print_ISBN :
0-7803-0727-5
DOI :
10.1109/BIPOL.1992.274083
