SiGe Bipolar VCO With Ultra-Wide Tuning Range at 80 GHz Center Frequency

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 outp...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2009-10, Vol.44 (10), p.2655-2662
Main Authors: Pohl, N., Rein, H.-M., Musch, T., Aufinger, K., Hausner, J.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Circuits
Decoupling
Design. Technologies. Operation analysis. Testing
Diodes
Electric potential
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Energy consumption
Exact sciences and technology
Frequency conversion
Frequency ranges
Germanium silicon alloys
Integrated circuits
Millimeter-wave VCOs
Oscillators, resonators, synthetizers
Phase noise
Power consumption
Power generation
regenerative frequency divider
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SiGe bipolar ICs
Signal convertors
Silicon germanides
Silicon germanium
Tuning
ultra-wideband
Varactors
Voltage
Voltage-controlled oscillators
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Summary: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.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2009.2026822