TW200514349A - Linear-in-decibel variable gain amplifier - Google Patents

Linear-in-decibel variable gain amplifier

Info

Publication number
TW200514349A
TW200514349A TW092127224A TW92127224A TW200514349A TW 200514349 A TW200514349 A TW 200514349A TW 092127224 A TW092127224 A TW 092127224A TW 92127224 A TW92127224 A TW 92127224A TW 200514349 A TW200514349 A TW 200514349A
Authority
TW
Taiwan
Prior art keywords
voltage
linear
controlling
gain
variable gain
Prior art date
Application number
TW092127224A
Other languages
Chinese (zh)
Other versions
TWI234924B (en
Inventor
Ying-Yao Lin
Chao-Cheng Lee
Tung-Ming Su
Original Assignee
Realtek Semiconductor Corp
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 Realtek Semiconductor Corp filed Critical Realtek Semiconductor Corp
Priority to TW92127224A priority Critical patent/TWI234924B/en
Priority to US10/709,197 priority patent/US7078972B2/en
Priority to DE102004036525.3A priority patent/DE102004036525B4/en
Publication of TW200514349A publication Critical patent/TW200514349A/en
Application granted granted Critical
Publication of TWI234924B publication Critical patent/TWI234924B/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
    • 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
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Abstract

A linear-in-decibel variable gain amplifier comprises: an amplifying stage, for generating an output voltage according to a differential input voltage; and a gain-controlling stage, for outputting a gain-controlling voltage to the amplifying stage according to a first controlling voltage and a second controlling voltage. A voltage gain of the linear-in-decibel variable gain amplifier is inverse proportional to a simple exponential function, and the value of the simple exponential function is determined by the difference between the first controlling voltage and the second controlling voltage. The value of the voltage gain is irrelevant to the change of the thermal voltage.
TW92127224A 2003-10-01 2003-10-01 Linear-in-decibel variable gain amplifier TWI234924B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
TW92127224A TWI234924B (en) 2003-10-01 2003-10-01 Linear-in-decibel variable gain amplifier
US10/709,197 US7078972B2 (en) 2003-10-01 2004-04-20 Linear decibel-scale variable gain amplifier
DE102004036525.3A DE102004036525B4 (en) 2003-10-01 2004-07-28 Control amplifier with linear decibel scale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW92127224A TWI234924B (en) 2003-10-01 2003-10-01 Linear-in-decibel variable gain amplifier

Publications (2)

Publication Number Publication Date
TW200514349A true TW200514349A (en) 2005-04-16
TWI234924B TWI234924B (en) 2005-06-21

Family

ID=34433018

Family Applications (1)

Application Number Title Priority Date Filing Date
TW92127224A TWI234924B (en) 2003-10-01 2003-10-01 Linear-in-decibel variable gain amplifier

Country Status (2)

Country Link
DE (1) DE102004036525B4 (en)
TW (1) TWI234924B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI573391B (en) * 2016-02-18 2017-03-01 晶豪科技股份有限公司 Variable gain amplifying circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5999053A (en) * 1998-07-02 1999-12-07 Philips Electronics North America Corporation Current steering variable gain amplifier with linearizer
JP2000269757A (en) * 1999-03-12 2000-09-29 Mitsubishi Electric Corp Gain control circuit
TW589784B (en) * 2003-09-01 2004-06-01 Realtek Semiconductor Corp Linear-in-decibel variable gain amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI573391B (en) * 2016-02-18 2017-03-01 晶豪科技股份有限公司 Variable gain amplifying circuit

Also Published As

Publication number Publication date
DE102004036525B4 (en) 2016-09-01
TWI234924B (en) 2005-06-21
DE102004036525A1 (en) 2005-05-12

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Legal Events

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MK4A Expiration of patent term of an invention patent