Low Phase Noise and Wide-Range Class-C VCO Using Auto-Adaptive Bias Technique

This paper proposes a new structure of 24-GHz class-C voltage-controlled oscillator (VCO) using an auto-adaptive bias technique. The VCO in this paper uses a digitally controlled circuit to eliminate the possibility of start-up failure that a class-C structure can have and has low phase noise and a...

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Bibliographic Details
Published in:Electronics (Basel) 2020-08, Vol.9 (8), p.1290
Main Authors: Lee, Jeong-Yun, Kim, Gwang Sub, Ko, Goo-Han, Oh, Kwang-Il, Park, Jae Gyeong, Baek, Donghyun
Format: Article
Language:English
Subjects:
Bias
Circuits
CMOS
Frequency ranges
Noise
Phase noise
Power consumption
Simulation
Transistors
Tuning
Voltage controlled oscillators
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Summary:This paper proposes a new structure of 24-GHz class-C voltage-controlled oscillator (VCO) using an auto-adaptive bias technique. The VCO in this paper uses a digitally controlled circuit to eliminate the possibility of start-up failure that a class-C structure can have and has low phase noise and a wide frequency range. To expand the frequency tuning range, a 3-bit cap-bank is used and a triple-coupled transformer is used as the core inductor. The proposed class-C VCO implements a 65-nm RF CMOS process. It has a phase noise performance of −105 dBc/Hz or less at 1-MHz offset frequency and the output frequency range is from 22.8 GHz to 27.3 GHz, which consumes 8.3–10.6 mW of power. The figure-of-merit with tuning range (FoMT) of this design reached 191.1 dBc/Hz.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics9081290