JPS54107656A - Distortion compensation unit for predistortion - Google Patents

Distortion compensation unit for predistortion

Info

Publication number
JPS54107656A
JPS54107656A JP1516478A JP1516478A JPS54107656A JP S54107656 A JPS54107656 A JP S54107656A JP 1516478 A JP1516478 A JP 1516478A JP 1516478 A JP1516478 A JP 1516478A JP S54107656 A JPS54107656 A JP S54107656A
Authority
JP
Japan
Prior art keywords
variation
amplifier
gain
gain variation
distortion compensation
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.)
Granted
Application number
JP1516478A
Other languages
Japanese (ja)
Other versions
JPS5653881B2 (en
Inventor
Shigeharu Okamoto
Toshio Nojima
Toru Ooyama
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP1516478A priority Critical patent/JPS54107656A/en
Publication of JPS54107656A publication Critical patent/JPS54107656A/en
Publication of JPS5653881B2 publication Critical patent/JPS5653881B2/ja
Granted legal-status Critical Current

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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To perform stable kdistortion compensation for a long time, by providing the level adjuster between the predistorter circuit for distortion compensation and the compensated amplifier, and controlling the level adjuster depending on the gain variation of the compensated amplifier. CONSTITUTION:The compensation amount is greatly varied with the gain and position variation of the compensated amplifier. For example, the region to realize the compensating amount more than 25 dB is within + or - 0.8 dB for gain variation and within + or - 2.5 degrees for the phase variation. Accordingly, the means compensating the gain variation of the amplifier at the input is very effective to the distortion compensation. The signal distributed from the disributors 21 and 22 is monitored with the gain variation detector 23 and the level adjuster 16 is controlled depending on the variation and the input level of the compensated amplifier 13 is controlled, allowing to cancel the gain variation. Further, the gain variation of the amplifier is due to temperature, the level adjustment due to temperature detection can also be effective.
JP1516478A 1978-02-10 1978-02-10 Distortion compensation unit for predistortion Granted JPS54107656A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1516478A JPS54107656A (en) 1978-02-10 1978-02-10 Distortion compensation unit for predistortion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1516478A JPS54107656A (en) 1978-02-10 1978-02-10 Distortion compensation unit for predistortion

Publications (2)

Publication Number Publication Date
JPS54107656A true JPS54107656A (en) 1979-08-23
JPS5653881B2 JPS5653881B2 (en) 1981-12-22

Family

ID=11881152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1516478A Granted JPS54107656A (en) 1978-02-10 1978-02-10 Distortion compensation unit for predistortion

Country Status (1)

Country Link
JP (1) JPS54107656A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3002995A1 (en) * 1979-02-13 1980-08-14 Nippon Telegraph & Telephone ADJUSTABLE EQUALIZATION SYSTEM FOR NON-LINEARITIES
EP0132760A2 (en) * 1983-07-22 1985-02-13 Fujitsu Limited FET power amplifying apparatus
EP0359477A2 (en) * 1988-09-13 1990-03-21 Nokia Mobile Phones Ltd. Linearization of an amplification in an RF amplifier
US6275103B1 (en) 1998-09-02 2001-08-14 Fujitsu Limited Predistorter of amplifier and amplifying unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59182598A (en) * 1983-03-31 1984-10-17 三菱電機株式会社 Printed circuit board containing case
JPS59189292U (en) * 1983-06-02 1984-12-15 日本電気株式会社 electronic equipment structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3002995A1 (en) * 1979-02-13 1980-08-14 Nippon Telegraph & Telephone ADJUSTABLE EQUALIZATION SYSTEM FOR NON-LINEARITIES
EP0132760A2 (en) * 1983-07-22 1985-02-13 Fujitsu Limited FET power amplifying apparatus
EP0359477A2 (en) * 1988-09-13 1990-03-21 Nokia Mobile Phones Ltd. Linearization of an amplification in an RF amplifier
US6275103B1 (en) 1998-09-02 2001-08-14 Fujitsu Limited Predistorter of amplifier and amplifying unit

Also Published As

Publication number Publication date
JPS5653881B2 (en) 1981-12-22

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