A Low-Power SiGe Tunable Synchronous Oscillator for UMTS Downlink

Jean-Baptiste BEGUERET  Thierry TARIS  Herve LAPUYADE  Yann DEVAL  

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.8   pp.1422-1426
Publication Date: 2003/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
synchronous oscillator,  frequency synthesis,  UMTS,  SiGe technology,  

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An ultra-low power 4.3 GHz Synchronous Oscillator (SO) is presented, integrated in a 0.25 µm BiCMOS SiGe technology, to act as the RF loop of an UMTS double-loop synthesizer. This SO is tunable in order to counteract technology discrepancies. Hence, the synchronization range is smaller, reducing unwanted synchronization and improving the frequency generation accuracy. This 1.8 V SO provides a -115 dBc/Hz phase noise at 100 kHz offset, consuming only 3.6 mW.