NDLI: Linearly frequency-tunable and low-phase noise ring VCO using varactors with optimally-spaced bias voltages

Content Provider	IET Digital Library
Author	Lee, J. Choi, S. H. Cho, Y. Choi, J. H.
Abstract	A linearly frequency-tunable and low-phase noise ring voltage-controlled oscillator (VCO) is presented. Using multiple varactors, of which the bias voltages can be optimally controlled, the voltage-to-frequency gain, K VCO, can be kept constant over control voltages in all frequency bands. Since the noise contribution and the power consumption of the proposed frequency-tuning method are minimal, the ring VCO also can achieve low phase noise and an excellent figure-of-merit (FOM). The prototype ring VCO was fabricated in a 180-nm CMOS technology. In measurements, the variation of K VCO over the full range of control voltages was restricted to less than ±12%, even in the worst case. The 1-MHz phase noise and the FOM of a 1.22-GHz signal were –108.7 dBc/Hz and 161.3 dB, respectively, when the power consumption was 8.5 mW.
Starting Page	342
Ending Page	344
Page Count	3
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 6, Mar (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.4394
Journal	Electronics Letters
Publisher Date	2018-02-02
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bias Voltage Capacitor CMOS Analogue Integrated Circuit CMOS Integrated Circuit CMOS Technology Control Voltage Figure of Merit FOM Frequency 1.22 GHz Frequency Band Junction And Barrier Diode Linearly Frequency-tunable VCO Low-phase Noise Ring Voltage-controlled Oscillator Microwave IC Multiple Varactors Noise Contribution Oscillator Phase Noise Power 8.5 MW Power Consumption Size 180 Nm UHF Integrated Circuit UHF Oscillator Varactors Voltage-controlled Oscillator Voltage-to-frequency Gain
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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