Linearity of Bulk-Controlled Inverter Ring VCO in Weak and Strong Inversion

Ulrik Sørensen Wismar; Dag T. Wisland; Pietro Andreani

doi:10.1109/NORCHP.2005.1597010

Linearity of Bulk-Controlled Inverter Ring VCO in Weak and Strong Inversion

Ulrik Sørensen Wismar, Dag T. Wisland, Pietro Andreani

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Abstract

Frequency modulation in ring VCOs is investigated. Primarily, the linearity of conversion from input voltage to output frequency is considered. Bulk-voltage control of the threshold voltage of the VCO transistors is found to be a very promising approach for applications in frequency ΔΣ converters. Different approaches apply in presence of high supply voltages, when transistors work in strong inversion, compared to low supply voltages, when transistors are in weak inversion. In strong inversion, second-order effects controlled by the supply voltage linearize the VCO modulation, while in weak inversion an improved linearity can be obtained using soft rails, at the expense of a reduced sensitivity.

Original language	English
Title of host publication	Norchip 2005
Publisher	IEEE
Publication date	2005
Pages	145-148
ISBN (Print)	1-4244-0064-3
DOIs	https://doi.org/10.1109/NORCHP.2005.1597010
Publication status	Published - 2005
Event	2005 IEEE 23rd NORCHIP Conference - Oulu, Finland Duration: 21 Nov 2005 → 22 Nov 2005 https://ieeexplore.ieee.org/xpl/conhome/10643/proceeding

Conference

Conference	2005 IEEE 23rd NORCHIP Conference
Country/Territory	Finland
City	Oulu
Period	21/11/2005 → 22/11/2005
Internet address	https://ieeexplore.ieee.org/xpl/conhome/10643/proceeding

Bibliographical note

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

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title = "Linearity of Bulk-Controlled Inverter Ring VCO in Weak and Strong Inversion",

abstract = "Frequency modulation in ring VCOs is investigated. Primarily, the linearity of conversion from input voltage to output frequency is considered. Bulk-voltage control of the threshold voltage of the VCO transistors is found to be a very promising approach for applications in frequency ΔΣ converters. Different approaches apply in presence of high supply voltages, when transistors work in strong inversion, compared to low supply voltages, when transistors are in weak inversion. In strong inversion, second-order effects controlled by the supply voltage linearize the VCO modulation, while in weak inversion an improved linearity can be obtained using soft rails, at the expense of a reduced sensitivity.",

author = "Wismar, {Ulrik S{\o}rensen} and Wisland, {Dag T.} and Pietro Andreani",

note = "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; 2005 IEEE 23rd NORCHIP Conference ; Conference date: 21-11-2005 Through 22-11-2005",

year = "2005",

doi = "10.1109/NORCHP.2005.1597010",

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isbn = "1-4244-0064-3",

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AU - Wismar, Ulrik Sørensen

AU - Wisland, Dag T.

AU - Andreani, Pietro

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

Y1 - 2005

N2 - Frequency modulation in ring VCOs is investigated. Primarily, the linearity of conversion from input voltage to output frequency is considered. Bulk-voltage control of the threshold voltage of the VCO transistors is found to be a very promising approach for applications in frequency ΔΣ converters. Different approaches apply in presence of high supply voltages, when transistors work in strong inversion, compared to low supply voltages, when transistors are in weak inversion. In strong inversion, second-order effects controlled by the supply voltage linearize the VCO modulation, while in weak inversion an improved linearity can be obtained using soft rails, at the expense of a reduced sensitivity.

AB - Frequency modulation in ring VCOs is investigated. Primarily, the linearity of conversion from input voltage to output frequency is considered. Bulk-voltage control of the threshold voltage of the VCO transistors is found to be a very promising approach for applications in frequency ΔΣ converters. Different approaches apply in presence of high supply voltages, when transistors work in strong inversion, compared to low supply voltages, when transistors are in weak inversion. In strong inversion, second-order effects controlled by the supply voltage linearize the VCO modulation, while in weak inversion an improved linearity can be obtained using soft rails, at the expense of a reduced sensitivity.

U2 - 10.1109/NORCHP.2005.1597010

DO - 10.1109/NORCHP.2005.1597010

M3 - Article in proceedings

SN - 1-4244-0064-3

SP - 145

EP - 148

BT - Norchip 2005

PB - IEEE

T2 - 2005 IEEE 23rd NORCHIP Conference

Y2 - 21 November 2005 through 22 November 2005

ER -

Linearity of Bulk-Controlled Inverter Ring VCO in Weak and Strong Inversion

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