JPS5592009A - Variable gain amplifier - Google Patents

Variable gain amplifier

Info

Publication number
JPS5592009A
JPS5592009A JP16512178A JP16512178A JPS5592009A JP S5592009 A JPS5592009 A JP S5592009A JP 16512178 A JP16512178 A JP 16512178A JP 16512178 A JP16512178 A JP 16512178A JP S5592009 A JPS5592009 A JP S5592009A
Authority
JP
Japan
Prior art keywords
switches
agc voltage
variable gain
gain amplifier
dynamic range
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.)
Pending
Application number
JP16512178A
Other languages
Japanese (ja)
Inventor
Takeshi Takano
Yasuyuki Tokumitsu
Yoichi Arai
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16512178A priority Critical patent/JPS5592009A/en
Publication of JPS5592009A publication Critical patent/JPS5592009A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a wide dynamic range by switching selector switches or circulators and switching selectively selection switches by an AGC voltage to control the number of cascaded unit amplifiers. CONSTITUTION:A part of the output of micro wave output terminal 29 is detected by detector 30 and is applied to switch controller 31 as an AGC voltage. Controller 31 switches selector switches 251-25n-1 and selection switch 26 according to the AGC voltage so that the output level of terminal 29 may be fixed and controls the number of cascaded unit amplifiers 24-1-24-n. Consequently, a variable gain amplifier which has a wide dynamic range and no degradation of noise factor can be obtained.
JP16512178A 1978-12-29 1978-12-29 Variable gain amplifier Pending JPS5592009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16512178A JPS5592009A (en) 1978-12-29 1978-12-29 Variable gain amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16512178A JPS5592009A (en) 1978-12-29 1978-12-29 Variable gain amplifier

Publications (1)

Publication Number Publication Date
JPS5592009A true JPS5592009A (en) 1980-07-12

Family

ID=15806307

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16512178A Pending JPS5592009A (en) 1978-12-29 1978-12-29 Variable gain amplifier

Country Status (1)

Country Link
JP (1) JPS5592009A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735668A1 (en) * 1995-03-30 1996-10-02 AT&T IPM Corp. High-efficient configurable power amplifier for use in a portable unit
US5606284A (en) * 1994-08-26 1997-02-25 Matsushita Electric Industrial Co., Ltd. Automatic gain control device for producing constant amplitude output signal
US6265935B1 (en) * 1998-02-19 2001-07-24 Ntt Mobile Communications Network Inc. Amplifier for radio transmission
JP2009127864A (en) * 2007-11-23 2009-06-11 Dr Ing Hcf Porsche Ag Device for encapsulating main bearing of crankshaft

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5606284A (en) * 1994-08-26 1997-02-25 Matsushita Electric Industrial Co., Ltd. Automatic gain control device for producing constant amplitude output signal
EP0735668A1 (en) * 1995-03-30 1996-10-02 AT&T IPM Corp. High-efficient configurable power amplifier for use in a portable unit
US6265935B1 (en) * 1998-02-19 2001-07-24 Ntt Mobile Communications Network Inc. Amplifier for radio transmission
JP2009127864A (en) * 2007-11-23 2009-06-11 Dr Ing Hcf Porsche Ag Device for encapsulating main bearing of crankshaft

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