Low Phase Noise Differential CMOS VCO Based on Tapped-Inductor Resonator

The design of a low phase noise 4 GHz voltage controlled oscillator (VCO) based on tapped inductor with 10% frequency tuning range fabricated in 0.18-um 1P6M CMOS technology is reported. The LC resonator consists of two tapped inductors and varactors. The varactors have one control terminal to vary...

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Bibliographic Details
Main Authors: Yun-Hsueh Chuang, Sheng-Lyang Jang, Chien-Feng Lee, Shao-Hua Lee, Cheng-Bing Liu
Format: Conference Proceeding
Language:English
Subjects:
Capacitance
CMOS technology
Frequency measurement
Inductors
Noise measurement
Phase noise
Tuning
Varactors
Voltage measurement
Voltage-controlled oscillators
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Summary:The design of a low phase noise 4 GHz voltage controlled oscillator (VCO) based on tapped inductor with 10% frequency tuning range fabricated in 0.18-um 1P6M CMOS technology is reported. The LC resonator consists of two tapped inductors and varactors. The varactors have one control terminal to vary the effective resonator capacitance, which is used to fine tune VCO output frequency. The VCO core consumes power of 7.5 mW at 1.5 V supply voltage. The measured phase noise is -121 dBc/Hz at 1MHz offset from the oscillation frequency of 4.4 GHz. The oscillation frequency can be tuned from to 4.05 GHz to 4.47 GHz. This topology can reduce the drain-to-body junction capacitance and can increase the tuning range.
DOI:10.1109/VDAT.2007.373249