Systematic design of supply regulated LC-tank voltage-controlled oscillators

Xuejin Wang; Bertan Bakkaloglu

doi:10.1109/TCSI.2008.918004

Systematic design of supply regulated LC-tank voltage-controlled oscillators

Xuejin Wang, Bertan Bakkaloglu

Research output: Contribution to journal › Article

10 Scopus citations

Abstract

Systematic design of low-dropout-regulator (LDO) regulated low-phase-noise LC-tank voltage controlled oscillators (VCOs) is presented. Low-frequency sensitivity profile of power supply induced phase noise of a typical cross-coupled LC-tank VCO is investigated. The relationship between frequency pushing and power supply-induced phase noise is derived. Systematic codesign of VCO sensitivity to low-frequency supply noise with respect to an LDO output noise and power supply rejection profile is introduced. To demonstrate the design approach experimentally, two 2.4-GHz LC-tank VCOs with pMOS and nMOS switching devices powered by PFET LDOs are designed and fabricated on an 0.18-μm, 7-layer metal CMOS process. By using an integrated LDO, it is shown that the VCO phase-noise sensitivity to low frequency improves by 55 dB at 100-kHz offset.

Original language	English (US)
Pages (from-to)	1834-1844
Number of pages	11
Journal	IEEE Transactions on Circuits and Systems I: Regular Papers
Volume	55
Issue number	7
DOIs	https://doi.org/10.1109/TCSI.2008.918004
State	Published - Aug 1 2008

Keywords

DC-DC power conversion
Phase noise
Power supply rejection (PSR)
Voltage regulators
Voltage-controlled oscillators (VCOs)

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/TCSI.2008.918004

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Wang, X., & Bakkaloglu, B. (2008). Systematic design of supply regulated LC-tank voltage-controlled oscillators. IEEE Transactions on Circuits and Systems I: Regular Papers, 55(7), 1834-1844. https://doi.org/10.1109/TCSI.2008.918004

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title = "Systematic design of supply regulated LC-tank voltage-controlled oscillators",

abstract = "Systematic design of low-dropout-regulator (LDO) regulated low-phase-noise LC-tank voltage controlled oscillators (VCOs) is presented. Low-frequency sensitivity profile of power supply induced phase noise of a typical cross-coupled LC-tank VCO is investigated. The relationship between frequency pushing and power supply-induced phase noise is derived. Systematic codesign of VCO sensitivity to low-frequency supply noise with respect to an LDO output noise and power supply rejection profile is introduced. To demonstrate the design approach experimentally, two 2.4-GHz LC-tank VCOs with pMOS and nMOS switching devices powered by PFET LDOs are designed and fabricated on an 0.18-μm, 7-layer metal CMOS process. By using an integrated LDO, it is shown that the VCO phase-noise sensitivity to low frequency improves by 55 dB at 100-kHz offset.",

keywords = "DC-DC power conversion, Phase noise, Power supply rejection (PSR), Voltage regulators, Voltage-controlled oscillators (VCOs)",

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N2 - Systematic design of low-dropout-regulator (LDO) regulated low-phase-noise LC-tank voltage controlled oscillators (VCOs) is presented. Low-frequency sensitivity profile of power supply induced phase noise of a typical cross-coupled LC-tank VCO is investigated. The relationship between frequency pushing and power supply-induced phase noise is derived. Systematic codesign of VCO sensitivity to low-frequency supply noise with respect to an LDO output noise and power supply rejection profile is introduced. To demonstrate the design approach experimentally, two 2.4-GHz LC-tank VCOs with pMOS and nMOS switching devices powered by PFET LDOs are designed and fabricated on an 0.18-μm, 7-layer metal CMOS process. By using an integrated LDO, it is shown that the VCO phase-noise sensitivity to low frequency improves by 55 dB at 100-kHz offset.

AB - Systematic design of low-dropout-regulator (LDO) regulated low-phase-noise LC-tank voltage controlled oscillators (VCOs) is presented. Low-frequency sensitivity profile of power supply induced phase noise of a typical cross-coupled LC-tank VCO is investigated. The relationship between frequency pushing and power supply-induced phase noise is derived. Systematic codesign of VCO sensitivity to low-frequency supply noise with respect to an LDO output noise and power supply rejection profile is introduced. To demonstrate the design approach experimentally, two 2.4-GHz LC-tank VCOs with pMOS and nMOS switching devices powered by PFET LDOs are designed and fabricated on an 0.18-μm, 7-layer metal CMOS process. By using an integrated LDO, it is shown that the VCO phase-noise sensitivity to low frequency improves by 55 dB at 100-kHz offset.

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KW - Phase noise

KW - Power supply rejection (PSR)

KW - Voltage regulators

KW - Voltage-controlled oscillators (VCOs)

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