Volker Thomas
Siemens
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Publication
Featured researches published by Volker Thomas.
international microwave symposium | 1998
Shen Feng; Bernd Kolb; Helmut Herrmann; Werner Veit; Volker Thomas; Stefan Herzinger; Francesco Volpe; Georg Dipl Ing Lipperer; Josef Fenk
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.
Archive | 1992
Josef Fenk; Volker Thomas
Archive | 1995
Volker Thomas
Archive | 1997
Stephan Weber; Volker Thomas
Archive | 1997
Stephan Weber; Volker Thomas
Archive | 1997
Stephan Weber; Volker Thomas
Archive | 1997
Volker Thomas
Archive | 1992
Josef Fenk; Volker Thomas
Archive | 2013
Umut Basaran; Josef Schmal; Stefan Herzinger; Herbert Stockinger; Volker Thomas
Archive | 1999
Josef Fenk; Volker Thomas; Wolfgang Thomann
