SiGe Bipolar VCO With Ultra-Wide Tuning Range at 80 GHz Center Frequency
Pohl, N.
Rein, H.-M.
Musch, T.
Aufinger, K.
Hausner, J.
Ruhr-Univ. Bochum, Bochum, Germany;
This paper appears in: Solid-State Circuits, IEEE Journal of
Publication Date: Oct. 2009
Volume: 44,
Issue: 10
On page(s): 2655-2662
ISSN: 0018-9200
INSPEC Accession Number: 10880515
Digital Object Identifier: 10.1109/JSSC.2009.2026822
Current Version Published: 2009-09-22
Abstract
A SiGe millimeter-wave VCO with a center frequency around 80 GHz and an extremely wide (continuous) tuning range of 24.5 GHz ( ap 30%) is presented. The phase noise at 1 MHz offset is -97 dBc/Hz at the center frequency (and less than -94 dBc/Hz in a frequency range of 21 GHz). The maximum total output power is about 12 dBm. A cascode buffer improves decoupling from the output load at reasonable VCO power consumption (240 mW at 5 V supply voltage). 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 limitation of the tuning range in millimeter-wave VCOs are shown and the improvement by using two (instead of one) varactor pairs is demonstrated.
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