A study of phase noise in colpitts and LC-tank CMOS oscillators

Pietro Andreani; Xiaoyan Wang; Luca Vandi; A. Fard

doi:10.1109/JSSC.2005.845991

A study of phase noise in colpitts and LC-tank CMOS oscillators

Pietro Andreani, Xiaoyan Wang, Luca Vandi, A. Fard

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Abstract

This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f(2) phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-mu m CMOS process. The best performance of the LC-tank oscillators shows a phase noise of -142 dBc/Hz at 3-MHz offset frequency from a 2.9-GHz carrier with a 16-mW power consumption, resulting in an excellent FoM of similar to 189 dBc/Hz. For the same oscillation frequency, the FoM displayed by the differential Colpitts oscillators is similar to 5 dB lower.

Original language	English
Journal	I E E E Journal of Solid State Circuits
Volume	40
Issue number	5
Pages (from-to)	1107-1118
ISSN	0018-9200
DOIs	https://doi.org/10.1109/JSSC.2005.845991
Publication status	Published - 2005

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Copyright: 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

Keywords

LC-tank
Colpitts
CMOS
phase noise
oscillators

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title = "A study of phase noise in colpitts and LC-tank CMOS oscillators",

abstract = "This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f(2) phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-mu m CMOS process. The best performance of the LC-tank oscillators shows a phase noise of -142 dBc/Hz at 3-MHz offset frequency from a 2.9-GHz carrier with a 16-mW power consumption, resulting in an excellent FoM of similar to 189 dBc/Hz. For the same oscillation frequency, the FoM displayed by the differential Colpitts oscillators is similar to 5 dB lower.",

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AU - Andreani, Pietro

AU - Wang, Xiaoyan

AU - Vandi, Luca

AU - Fard, A.

N1 - Copyright: 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

PY - 2005

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N2 - This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f(2) phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-mu m CMOS process. The best performance of the LC-tank oscillators shows a phase noise of -142 dBc/Hz at 3-MHz offset frequency from a 2.9-GHz carrier with a 16-mW power consumption, resulting in an excellent FoM of similar to 189 dBc/Hz. For the same oscillation frequency, the FoM displayed by the differential Colpitts oscillators is similar to 5 dB lower.

AB - This paper presents a study of phase noise in CMOS Colpitts and LC-tank oscillators. Closed-form symbolic formulas for the 1/f(2) phase-noise region are derived for both the Colpitts oscillator (either single-ended or differential) and the LC-tank oscillator, yielding highly accurate results under very general assumptions. A comparison between the differential Colpitts and the LC-tank oscillator is also carried out, which shows that the latter is capable of a 2-dB lower phase-noise figure-of-merit (FoM) when simplified oscillator designs and ideal MOS models are adopted. Several prototypes of both Colpitts and LC-tank oscillators have been implemented in a 0.35-mu m CMOS process. The best performance of the LC-tank oscillators shows a phase noise of -142 dBc/Hz at 3-MHz offset frequency from a 2.9-GHz carrier with a 16-mW power consumption, resulting in an excellent FoM of similar to 189 dBc/Hz. For the same oscillation frequency, the FoM displayed by the differential Colpitts oscillators is similar to 5 dB lower.

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KW - phase noise

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DO - 10.1109/JSSC.2005.845991

M3 - Journal article

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JO - I E E E Journal of Solid State Circuits

JF - I E E E Journal of Solid State Circuits

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A study of phase noise in colpitts and LC-tank CMOS oscillators

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