Title :
A bipolar upconversion modulation loop transmitter for dual-band mobile communications
Author :
Shen Feng ; Kolb, B. ; Herrmann, H. ; Veit, W. ; Thomas, V. ; Herzinger, S. ; Volpe, F. ; Lipperer, G. ; Fenk, J.
Author_Institution :
Siemens AG, Munich, Germany
Abstract :
This paper presents design considerations and measurement results of an upconversion modulation loop transmitter IC (PMB 2255) implemented in Siemens 26 GHz Si bipolar technology B6HF. The device consists of a vector modulator, downconversion mixer, a modulation phase-locked loop (PLL) and a three-wire programming bus. Besides power-down and standby modes, added values of switchable filter cutoff frequency and precharge function are also realized for dual- and multi-band digital mobile communication systems such as GSM900, GSM1800 and GSM1900. Based on measurements the device provides an excellent performance in designed intermediate frequency range from 300 to 550 MHz with supply voltage from 2.7 to 4.5 V, ambient temperature from -30 to 85/spl deg/C, and local and RF frequencies up to 2.0 GHz.
Keywords :
UHF frequency convertors; UHF integrated circuits; bipolar digital integrated circuits; digital radio; mobile radio; radio transmitters; -30 to 85 C; 2.7 to 4.5 V; 300 to 550 MHz; B6HF; GSM1800; GSM1900; GSM900; PMB 2255; Si; Siemens Si bipolar technology; downconversion mixer; dual-band mobile communication; modulation phase-locked loop; multi-band digital mobile communication; power-down mode; precharge function; standby mode; switchable filter cutoff frequency; three-wire programming bus; upconversion modulation loop transmitter IC; vector modulator; Bipolar integrated circuits; Communication switching; Cutoff frequency; Digital filters; Dual band; Mobile communication; Modulation coding; Phase locked loops; Phase modulation; Transmitters;
Conference_Titel :
Microwave Symposium Digest, 1998 IEEE MTT-S International
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-4471-5
DOI :
10.1109/MWSYM.1998.689329
