An 80 GHz SiGe Bipolar VCO with Wide Tuning Range Using Two Simultaneously Tuned Varactor Pairs
- 1 October 2008
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 15508781,p. 1-4
- https://doi.org/10.1109/csics.2008.46
Abstract
A SiGe millimeter-wave VCO with a center frequency of 80 GHz and an extremely wide (continuous) tuning range of 23 GHz (29%) is presented. The phase noise is ap -95.5 dBc/Hz (at 1 MHz offset frequency) and the total output power ap 12 dBm. A cascode buffer improves decoupling from the output load at reasonable VCO power consumption (240 mW). A low- power frequency divider (operating up to 100 GHz) provides, in addition, a divided-by-four signal. As a further intention of this paper, the basic reasons for the limitations of the tuning range in MMW-VCOs are shown and the improvement by using two (instead of one) varactor pairs is demonstrated.Keywords
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