NDLI: Ultra-low-phase-noise CMOS LC quadrature voltage controlled oscillator with Colpitts topology

Content Provider	IET Digital Library
Author	Hemmati, M. J.
Abstract	A new low-phase-noise colpitts LC quadrature voltage controlled oscillator (QVCO) is presented. The proposed QVCO is realised by coupling two differential current-switching Colpitts oscillators in an ‘in-phase–anti-phase’ manner. The coupling technique between the two Colpitts LC-voltage controlled oscillators (VCOs) has significantly improved the phase noise of the proposed circuit without using any extra elements. The oscillation frequency of the proposed LC-QVCO is 4 GHz. The Colpitts QVCO exhibits a phase noise of −131.5 and −141.3 dBc/Hz at 1 and 3 MHz offset, respectively. By generalising the coupling scheme to more than two differential Colpitts VCOs in a loop, multiphase signals can be generated.
Starting Page	166
Ending Page	168
Page Count	3
ISSN	00135194
Volume Number	50
e-ISSN	1350911X
Issue Number	Issue 3, Jan (2014)
Journal	Electronics Letters
Publisher Date	2014-01-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	CMOS Integrated Circuit Colpitts Topology Coupling Scheme Differential Current-switching Colpitts Oscillators Frequency 4 GHz In-phase-anti-phase Manner Microwave IC Microwave Oscillator Multiphase Signal Oscillator Quadrature Voltage Controlled Oscillator Ultra-low-phase Noise CMOS LC QVCO Voltage-controlled Oscillator
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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Ultra-low-phase-noise CMOS LC quadrature voltage controlled oscillator with Colpitts topology