JPS54140856A - Linearity compensator - Google Patents

Linearity compensator

Info

Publication number
JPS54140856A
JPS54140856A JP4895678A JP4895678A JPS54140856A JP S54140856 A JPS54140856 A JP S54140856A JP 4895678 A JP4895678 A JP 4895678A JP 4895678 A JP4895678 A JP 4895678A JP S54140856 A JPS54140856 A JP S54140856A
Authority
JP
Japan
Prior art keywords
circuit
output
level
input
signal
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
JP4895678A
Other languages
Japanese (ja)
Other versions
JPS6119131B2 (en
Inventor
Shizuo Yao
Akio Murakami
Satoru Azuma
Kimio Narahara
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4895678A priority Critical patent/JPS54140856A/en
Publication of JPS54140856A publication Critical patent/JPS54140856A/en
Publication of JPS6119131B2 publication Critical patent/JPS6119131B2/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 obtain a linearity compensator which can make adequate correction following up quickly to easy-to-vary non-linear characteristics. CONSTITUTION:An input signal is outputted by way of delay circuit 7, programmable attenuator 8 and amplifier circuit 9 with non-linear characterstics; and the input signal is branched at the input side, level-adjusted after passing through delay circuit 13, and then applied to error detector 14 which detects an amplitude error. The output of amplifier circuit 9 is also applied to the error detection circuit after being level-adjusted. Further, signal levels at both input and output sides applied to error detector 14 are so adjusted that when characteristics of circuit 9 are ideal, both the level will become equal. The output of this detector 14 is supplied to sample holding circuit 16. The signal branched at the input side is applied to comparator 10, where the input level is discriminated. This output is supplied to memory 11 and latch circuit 15. The output of circuit 16 is written into memory 11 by way of A/D converter 17 and adder 18 and at this time, the output of latch circuit 15 is used as a write address signal.
JP4895678A 1978-04-24 1978-04-24 Linearity compensator Granted JPS54140856A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4895678A JPS54140856A (en) 1978-04-24 1978-04-24 Linearity compensator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4895678A JPS54140856A (en) 1978-04-24 1978-04-24 Linearity compensator

Publications (2)

Publication Number Publication Date
JPS54140856A true JPS54140856A (en) 1979-11-01
JPS6119131B2 JPS6119131B2 (en) 1986-05-15

Family

ID=12817718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4895678A Granted JPS54140856A (en) 1978-04-24 1978-04-24 Linearity compensator

Country Status (1)

Country Link
JP (1) JPS54140856A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2540309A1 (en) * 1983-01-28 1984-08-03 Thomson Csf Linearisation device for a high-frequency amplifier with amplitude non-linearity
JP2005151119A (en) * 2003-11-14 2005-06-09 Fujitsu Ltd Distortion compensating apparatus
US6922104B2 (en) 2002-07-04 2005-07-26 Fujitsu Limited Power amplifier distortion compensation apparatus and method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH066770U (en) * 1992-06-30 1994-01-28 エヌティエヌ株式会社 Roller clutch unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2540309A1 (en) * 1983-01-28 1984-08-03 Thomson Csf Linearisation device for a high-frequency amplifier with amplitude non-linearity
US6922104B2 (en) 2002-07-04 2005-07-26 Fujitsu Limited Power amplifier distortion compensation apparatus and method thereof
JP2005151119A (en) * 2003-11-14 2005-06-09 Fujitsu Ltd Distortion compensating apparatus
JP4641715B2 (en) * 2003-11-14 2011-03-02 富士通株式会社 Distortion compensation apparatus and radio base station

Also Published As

Publication number Publication date
JPS6119131B2 (en) 1986-05-15

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