GB2496664B - Amplifier circuit with offset control - Google Patents

Amplifier circuit with offset control

Info

Publication number
GB2496664B
GB2496664B GB1119956.9A GB201119956A GB2496664B GB 2496664 B GB2496664 B GB 2496664B GB 201119956 A GB201119956 A GB 201119956A GB 2496664 B GB2496664 B GB 2496664B
Authority
GB
United Kingdom
Prior art keywords
amplifier circuit
offset control
offset
control
amplifier
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.)
Active
Application number
GB1119956.9A
Other versions
GB201119956D0 (en
GB2496664A (en
Inventor
John Paul Lesso
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.)
Cirrus Logic International Semiconductor Ltd
Original Assignee
Cirrus Logic International Semiconductor Ltd
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 Cirrus Logic International Semiconductor Ltd filed Critical Cirrus Logic International Semiconductor Ltd
Priority to GB1119956.9A priority Critical patent/GB2496664B/en
Publication of GB201119956D0 publication Critical patent/GB201119956D0/en
Publication of GB2496664A publication Critical patent/GB2496664A/en
Application granted granted Critical
Publication of GB2496664B publication Critical patent/GB2496664B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
    • 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
    • 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
    • H03F3/45484—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with bipolar transistors as the active amplifying circuit
    • H03F3/45596—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with bipolar transistors as the active amplifying circuit by offset reduction
    • H03F3/456—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with bipolar transistors as the active amplifying circuit by offset reduction by using a feedback circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
GB1119956.9A 2011-11-18 2011-11-18 Amplifier circuit with offset control Active GB2496664B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1119956.9A GB2496664B (en) 2011-11-18 2011-11-18 Amplifier circuit with offset control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1119956.9A GB2496664B (en) 2011-11-18 2011-11-18 Amplifier circuit with offset control

Publications (3)

Publication Number Publication Date
GB201119956D0 GB201119956D0 (en) 2012-01-04
GB2496664A GB2496664A (en) 2013-05-22
GB2496664B true GB2496664B (en) 2016-03-23

Family

ID=45475391

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1119956.9A Active GB2496664B (en) 2011-11-18 2011-11-18 Amplifier circuit with offset control

Country Status (1)

Country Link
GB (1) GB2496664B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9673762B2 (en) 2014-10-24 2017-06-06 Cirrus Logic, Inc. Amplifier with adjustable ramp up/down gain for minimizing or eliminating pop noise
GB2534440B (en) * 2014-10-24 2019-01-09 Cirrus Logic Inc Amplifier with adjustable ramp up/down gain for minimizing or eliminating pop noise
US9503023B2 (en) 2015-04-01 2016-11-22 Nxp B.V. Class-D amplifier
US10236827B2 (en) * 2017-01-20 2019-03-19 Cirrus Logic, Inc. Offset calibration for amplifier and preceding circuit
US10224877B2 (en) 2017-01-20 2019-03-05 Cirrus Logic, Inc. Closed-loop digital compensation scheme
GB2562125B (en) * 2017-01-20 2019-09-18 Cirrus Logic Int Semiconductor Ltd Closed-loop digital compensation scheme
US11799426B2 (en) * 2021-11-30 2023-10-24 Cirrus Logic Inc. Class D amplifier circuitry

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004208216A (en) * 2002-12-26 2004-07-22 Yamaha Corp Pulse width modulator/amplifier
GB2459865A (en) * 2008-05-07 2009-11-11 Wolfson Microelectronics Plc Audio amplifier with dc offset compensation
US20110080217A1 (en) * 2009-10-01 2011-04-07 Lee Yong-Hee Audio amplifier
EP2323254A1 (en) * 2009-11-16 2011-05-18 Nxp B.V. A plop-free amplifier
WO2011064787A1 (en) * 2009-11-30 2011-06-03 ST-Ericsson India Pvt. Ltd. Pop-up noise reduction in a device
EP2375566A1 (en) * 2010-04-12 2011-10-12 Dialog Semiconductor GmbH Duplicate feedback network in class D amplifiers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004208216A (en) * 2002-12-26 2004-07-22 Yamaha Corp Pulse width modulator/amplifier
GB2459865A (en) * 2008-05-07 2009-11-11 Wolfson Microelectronics Plc Audio amplifier with dc offset compensation
US20110080217A1 (en) * 2009-10-01 2011-04-07 Lee Yong-Hee Audio amplifier
EP2323254A1 (en) * 2009-11-16 2011-05-18 Nxp B.V. A plop-free amplifier
WO2011064787A1 (en) * 2009-11-30 2011-06-03 ST-Ericsson India Pvt. Ltd. Pop-up noise reduction in a device
EP2375566A1 (en) * 2010-04-12 2011-10-12 Dialog Semiconductor GmbH Duplicate feedback network in class D amplifiers

Also Published As

Publication number Publication date
GB201119956D0 (en) 2012-01-04
GB2496664A (en) 2013-05-22

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20150820 AND 20150826