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WO2004042782A3 - Apparatus and method for implementing a constant transconductance circuit - Google Patents

Apparatus and method for implementing a constant transconductance circuit Download PDF

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Publication number
WO2004042782A3
WO2004042782A3 PCT/SG2002/000235 SG0200235W WO2004042782A3 WO 2004042782 A3 WO2004042782 A3 WO 2004042782A3 SG 0200235 W SG0200235 W SG 0200235W WO 2004042782 A3 WO2004042782 A3 WO 2004042782A3
Authority
WO
WIPO (PCT)
Prior art keywords
resistance
mosfet
generating
constant transconductance
implementing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SG2002/000235
Other languages
French (fr)
Other versions
WO2004042782A2 (en
Inventor
Kok Lim Chan
Teck Hwee Lim
Chin Yong Edwin Lam
Piew Yoong Chee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National University of Singapore
Original Assignee
National University of Singapore
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National University of Singapore filed Critical National University of Singapore
Priority to AU2002349859A priority Critical patent/AU2002349859A1/en
Priority to PCT/SG2002/000235 priority patent/WO2004042782A2/en
Publication of WO2004042782A2 publication Critical patent/WO2004042782A2/en
Publication of WO2004042782A3 publication Critical patent/WO2004042782A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is DC
    • G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/205—Substrate bias-voltage generators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/34—DC amplifiers in which all stages are DC-coupled
    • H03F3/343—DC amplifiers in which all stages are DC-coupled with semiconductor devices only
    • H03F3/345—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with field-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/447—Indexing scheme relating to amplifiers the amplifier being protected to temperature influence

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)

Abstract

A circuit for generating constant transconductance using an on-chip resistance equivalent circuit in place of an off-chip resistor. The on-chip resistance equivalent circuit includes first and second MOSFETs. The first MOSFET is configured to operate in a triode region for generating a first resistance. The second MOSFET is configured to operate in a triode region and to mirror the first resistance of the first MOSFET, thereby generating a second resistance. The second resistance generated by the second MOSFET is then used for biasing a transconductance generating circuit to provide a biasing voltage with constant transconductance.
PCT/SG2002/000235 2002-10-15 2002-10-15 Apparatus and method for implementing a constant transconductance circuit Ceased WO2004042782A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002349859A AU2002349859A1 (en) 2002-10-15 2002-10-15 Apparatus and method for implementing a constant transconductance circuit
PCT/SG2002/000235 WO2004042782A2 (en) 2002-10-15 2002-10-15 Apparatus and method for implementing a constant transconductance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SG2002/000235 WO2004042782A2 (en) 2002-10-15 2002-10-15 Apparatus and method for implementing a constant transconductance circuit

Publications (2)

Publication Number Publication Date
WO2004042782A2 WO2004042782A2 (en) 2004-05-21
WO2004042782A3 true WO2004042782A3 (en) 2004-10-07

Family

ID=32310988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2002/000235 Ceased WO2004042782A2 (en) 2002-10-15 2002-10-15 Apparatus and method for implementing a constant transconductance circuit

Country Status (2)

Country Link
AU (1) AU2002349859A1 (en)
WO (1) WO2004042782A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011021070A1 (en) * 2009-08-19 2011-02-24 Nxp B.V. Circuit with reference source to control the small signal transconductance of an amplifier transistor
CN109062317B (en) 2018-09-07 2020-08-07 无锡华润矽科微电子有限公司 Constant current driving circuit and corresponding photoelectric smoke alarm circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5777518A (en) * 1996-10-30 1998-07-07 Lucent Technologies Inc. Method of biasing mosfet amplifiers for constant transconductance
US6323725B1 (en) * 1999-03-31 2001-11-27 Qualcomm Incorporated Constant transconductance bias circuit having body effect cancellation circuitry
US6407623B1 (en) * 2001-01-31 2002-06-18 Qualcomm Incorporated Bias circuit for maintaining a constant value of transconductance divided by load capacitance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5777518A (en) * 1996-10-30 1998-07-07 Lucent Technologies Inc. Method of biasing mosfet amplifiers for constant transconductance
US6323725B1 (en) * 1999-03-31 2001-11-27 Qualcomm Incorporated Constant transconductance bias circuit having body effect cancellation circuitry
US6407623B1 (en) * 2001-01-31 2002-06-18 Qualcomm Incorporated Bias circuit for maintaining a constant value of transconductance divided by load capacitance

Also Published As

Publication number Publication date
AU2002349859A8 (en) 2004-06-07
WO2004042782A2 (en) 2004-05-21
AU2002349859A1 (en) 2004-06-07

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