GB2333197B - Operational transconductance amplifier - Google Patents

Operational transconductance amplifier

Info

Publication number
GB2333197B
GB2333197B GB9800179A GB9800179A GB2333197B GB 2333197 B GB2333197 B GB 2333197B GB 9800179 A GB9800179 A GB 9800179A GB 9800179 A GB9800179 A GB 9800179A GB 2333197 B GB2333197 B GB 2333197B
Authority
GB
United Kingdom
Prior art keywords
transconductance amplifier
operational transconductance
operational
amplifier
transconductance
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.)
Expired - Fee Related
Application number
GB9800179A
Other versions
GB2333197A (en
GB9800179D0 (en
Inventor
Heinz Maeder
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Priority to GB9800179A priority Critical patent/GB2333197B/en
Publication of GB9800179D0 publication Critical patent/GB9800179D0/en
Publication of GB2333197A publication Critical patent/GB2333197A/en
Application granted granted Critical
Publication of GB2333197B publication Critical patent/GB2333197B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
    • 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
    • H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
    • H03F3/4521—Complementary long tailed pairs having parallel inputs and being supplied in parallel
    • H03F3/45219—Folded cascode stages
    • 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
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
    • H03F3/45632—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit
    • H03F3/45636—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by using feedback means
    • H03F3/45641—Measuring at the loading circuit of the differential amplifier
    • H03F3/45654—Controlling the active amplifying circuit of the differential amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/331—Sigma delta modulation being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45028—Indexing scheme relating to differential amplifiers the differential amplifier amplifying transistors are folded cascode coupled transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45122—Indexing scheme relating to differential amplifiers the folded cascode stage of the folded cascode differential amplifier being controlled by a controlling signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45398—Indexing scheme relating to differential amplifiers the AAC comprising a voltage generating circuit as bias circuit for the AAC
GB9800179A 1998-01-07 1998-01-07 Operational transconductance amplifier Expired - Fee Related GB2333197B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9800179A GB2333197B (en) 1998-01-07 1998-01-07 Operational transconductance amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9800179A GB2333197B (en) 1998-01-07 1998-01-07 Operational transconductance amplifier

Publications (3)

Publication Number Publication Date
GB9800179D0 GB9800179D0 (en) 1998-03-04
GB2333197A GB2333197A (en) 1999-07-14
GB2333197B true GB2333197B (en) 2002-09-25

Family

ID=10824869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9800179A Expired - Fee Related GB2333197B (en) 1998-01-07 1998-01-07 Operational transconductance amplifier

Country Status (1)

Country Link
GB (1) GB2333197B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6300831B1 (en) * 1999-12-21 2001-10-09 Texas Instruments Incorporated Compensating a Gm-boosted folded-cascode amplifier
CN103973243B (en) * 2013-01-24 2016-12-28 西安电子科技大学 Have the cmos operational amplifier of very big direct current open-loop voltage gain

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0397240A1 (en) * 1989-05-08 1990-11-14 Koninklijke Philips Electronics N.V. Amplifier arrangement
EP0643478A1 (en) * 1993-09-13 1995-03-15 Nec Corporation Cascode circuit operable at a low working voltage and having a high output impedance
EP0649218A1 (en) * 1993-10-15 1995-04-19 Hewlett-Packard Company Gain enhancement technique for operational amplifiers
US5469104A (en) * 1994-03-28 1995-11-21 Elantec, Inc. Active folded cascode

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0397240A1 (en) * 1989-05-08 1990-11-14 Koninklijke Philips Electronics N.V. Amplifier arrangement
EP0643478A1 (en) * 1993-09-13 1995-03-15 Nec Corporation Cascode circuit operable at a low working voltage and having a high output impedance
EP0649218A1 (en) * 1993-10-15 1995-04-19 Hewlett-Packard Company Gain enhancement technique for operational amplifiers
US5469104A (en) * 1994-03-28 1995-11-21 Elantec, Inc. Active folded cascode

Also Published As

Publication number Publication date
GB2333197A (en) 1999-07-14
GB9800179D0 (en) 1998-03-04

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20110107