A gate-modulated CMOS LC quadrature VCO

Kuang-Wei Cheng; David J. Allstot

doi:10.1109/RFIC.2009.5135537

A gate-modulated CMOS LC quadrature VCO

Kuang-Wei Cheng, David J. Allstot

Department of Electrical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

18 Citations (Scopus)

Abstract

A quadrature voltage-controlled oscillator (QVCO) based on the time-varying gate-modulated coupling of two LC tank VCOs is introduced. Using a standard 0.18μm CMOS process, the new topology is compared to the conventional series QVCO in terms of start-up loop gain, quadrature phase accuracy, phase noise, tuning range, and voltage headroom characteristics. In addition to comparable phase noise performance, the gate-modulated QVCO (GM-QVCO) also exhibits superior quadrature phase accuracy, and suitability for low power supply voltage designs that use cascode current sources and active loads. It draws 2.4 mA from a 1.8 V power supply, displays a phase noise of -122 dBc/Hz @ 1MHz offset, and has a quadrature phase error of 0.4°.

Original language	English
Title of host publication	Proceedings of the 2009 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2009
Pages	267-270
Number of pages	4
DOIs	https://doi.org/10.1109/RFIC.2009.5135537
Publication status	Published - 2009 Oct 27
Event	2009 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2009 - Boston, MA, United States Duration: 2009 Jun 7 → 2009 Jun 9

Publication series

Name	Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
ISSN (Print)	1529-2517

Other

Other	2009 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2009
Country	United States
City	Boston, MA
Period	09-06-07 → 09-06-09

All Science Journal Classification (ASJC) codes

Engineering(all)

Access to Document

10.1109/RFIC.2009.5135537

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Cite this

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title = "A gate-modulated CMOS LC quadrature VCO",

abstract = "A quadrature voltage-controlled oscillator (QVCO) based on the time-varying gate-modulated coupling of two LC tank VCOs is introduced. Using a standard 0.18μm CMOS process, the new topology is compared to the conventional series QVCO in terms of start-up loop gain, quadrature phase accuracy, phase noise, tuning range, and voltage headroom characteristics. In addition to comparable phase noise performance, the gate-modulated QVCO (GM-QVCO) also exhibits superior quadrature phase accuracy, and suitability for low power supply voltage designs that use cascode current sources and active loads. It draws 2.4 mA from a 1.8 V power supply, displays a phase noise of -122 dBc/Hz @ 1MHz offset, and has a quadrature phase error of 0.4°.",

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Cheng, K-W & Allstot, DJ 2009, A gate-modulated CMOS LC quadrature VCO. in Proceedings of the 2009 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2009., 5135537, Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium, pp. 267-270, 2009 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2009, Boston, MA, United States, 09-06-07. https://doi.org/10.1109/RFIC.2009.5135537

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N2 - A quadrature voltage-controlled oscillator (QVCO) based on the time-varying gate-modulated coupling of two LC tank VCOs is introduced. Using a standard 0.18μm CMOS process, the new topology is compared to the conventional series QVCO in terms of start-up loop gain, quadrature phase accuracy, phase noise, tuning range, and voltage headroom characteristics. In addition to comparable phase noise performance, the gate-modulated QVCO (GM-QVCO) also exhibits superior quadrature phase accuracy, and suitability for low power supply voltage designs that use cascode current sources and active loads. It draws 2.4 mA from a 1.8 V power supply, displays a phase noise of -122 dBc/Hz @ 1MHz offset, and has a quadrature phase error of 0.4°.

AB - A quadrature voltage-controlled oscillator (QVCO) based on the time-varying gate-modulated coupling of two LC tank VCOs is introduced. Using a standard 0.18μm CMOS process, the new topology is compared to the conventional series QVCO in terms of start-up loop gain, quadrature phase accuracy, phase noise, tuning range, and voltage headroom characteristics. In addition to comparable phase noise performance, the gate-modulated QVCO (GM-QVCO) also exhibits superior quadrature phase accuracy, and suitability for low power supply voltage designs that use cascode current sources and active loads. It draws 2.4 mA from a 1.8 V power supply, displays a phase noise of -122 dBc/Hz @ 1MHz offset, and has a quadrature phase error of 0.4°.

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