GB2450063A - Amplified gain control - Google Patents

Amplified gain control Download PDF

Info

Publication number
GB2450063A
GB2450063A GB0818986A GB0818986A GB2450063A GB 2450063 A GB2450063 A GB 2450063A GB 0818986 A GB0818986 A GB 0818986A GB 0818986 A GB0818986 A GB 0818986A GB 2450063 A GB2450063 A GB 2450063A
Authority
GB
United Kingdom
Prior art keywords
amplifier
input
gain control
amplified gain
gain
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.)
Withdrawn
Application number
GB0818986A
Other versions
GB0818986D0 (en
Inventor
Richard Peter Apsey
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.)
Agere Systems UK Ltd
Original Assignee
Agere Systems UK 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 Agere Systems UK Ltd filed Critical Agere Systems UK Ltd
Publication of GB0818986D0 publication Critical patent/GB0818986D0/en
Publication of GB2450063A publication Critical patent/GB2450063A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/342—Muting when some special characteristic of the signal is sensed which distinguishes it from noise, e.g. using speech detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

There is described a method and an apparatus for controlling gain adjustment in an amplification stage including an amplifier comprising the steps of: muting an input to the amplifier; and whilst the input is muted, adjusting the amplifier gain. The step of adjusting the gain of the amplifier comprises a step adjustment. The step of muting the input to the amplifier comprises ramping down the input to the amplifier.
GB0818986A 2006-03-28 2008-10-16 Amplified gain control Withdrawn GB2450063A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB2006/001131 WO2007110556A1 (en) 2006-03-28 2006-03-28 Amplifier gain control

Publications (2)

Publication Number Publication Date
GB0818986D0 GB0818986D0 (en) 2008-11-26
GB2450063A true GB2450063A (en) 2008-12-10

Family

ID=37102412

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0818986A Withdrawn GB2450063A (en) 2006-03-28 2008-10-16 Amplified gain control

Country Status (2)

Country Link
GB (1) GB2450063A (en)
WO (1) WO2007110556A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2507096B (en) 2012-10-19 2016-03-23 Cirrus Logic Int Semiconductor Ltd Digital/analogue conversion
EP3276825B1 (en) * 2016-07-27 2021-05-26 Nxp B.V. Gain calibration controller

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5757940A (en) * 1994-01-24 1998-05-26 Fujitsu Limited Electric volume controller
US5915030A (en) * 1996-07-26 1999-06-22 Stmicroelectronics, Gmbh Electric muting circuit
EP0932253A2 (en) * 1998-01-15 1999-07-28 Texas Instruments Incorporated Soft gain update method & apparatus
WO2001052409A1 (en) * 2000-01-13 2001-07-19 Acoustic Technologies, Inc. Soft mute circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5757940A (en) * 1994-01-24 1998-05-26 Fujitsu Limited Electric volume controller
US5915030A (en) * 1996-07-26 1999-06-22 Stmicroelectronics, Gmbh Electric muting circuit
EP0932253A2 (en) * 1998-01-15 1999-07-28 Texas Instruments Incorporated Soft gain update method & apparatus
WO2001052409A1 (en) * 2000-01-13 2001-07-19 Acoustic Technologies, Inc. Soft mute circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"13. Tonmeistertagung Muenchen 1984" November 1984. Bildungswerk des Verbands Deutcher Tonmeister, Berlin, XP002406394 page 470 par.2 - par.3; fig.6 *

Also Published As

Publication number Publication date
GB0818986D0 (en) 2008-11-26
WO2007110556A1 (en) 2007-10-04

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)