This paper presents an overview of SiGe technologies and their correspondin
g noise properties both in the high frequency and low frequency range. We d
emonstrate that SiGe bipolar technology exhibits impressive low frequency n
oise performance with an excess corner noise frequency in the I kHz range.
These results have been validated by low phase noise microwave oscillators
based on SiGe material. (C) 2001 Elsevier Science Ltd. All rights reserved.