CA2220922A1 - Automatic predistortion adjusting circuit having stable non-linear characteristics regardless of input signal frequency - Google Patents

Automatic predistortion adjusting circuit having stable non-linear characteristics regardless of input signal frequency

Info

Publication number
CA2220922A1
CA2220922A1 CA002220922A CA2220922A CA2220922A1 CA 2220922 A1 CA2220922 A1 CA 2220922A1 CA 002220922 A CA002220922 A CA 002220922A CA 2220922 A CA2220922 A CA 2220922A CA 2220922 A1 CA2220922 A1 CA 2220922A1
Authority
CA
Canada
Prior art keywords
signal
output signal
linear characteristics
input signal
variable
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
CA002220922A
Other languages
French (fr)
Other versions
CA2220922C (en
Inventor
Akio Fukuchi
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
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 filed Critical NEC Corp
Publication of CA2220922A1 publication Critical patent/CA2220922A1/en
Application granted granted Critical
Publication of CA2220922C publication Critical patent/CA2220922C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • 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
    • H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits

Abstract

In an automatic predistortion adjusting circuit, a splitter splits an input signal into first and second signals.
A predistortion circuit applies first non-linear characteristics to the first signal, a variable attenuator adjusts an amplitude of an output signal of the predistortion circuit, a variable phase shifter adjusts a phase of an output signal of the variable attenuator, and a main amplifier amplifies an output signal of the variable phase shifter, so that second non-linear characteristics opposite to the first non-linear characteristics are applied to an output signal of the main amplifier. A directional coupler takes out a part of an output signal of the main amplifier as a branch signal, and a delay line delays the second signal. An adder adds a delayed signal passed through the delay line to the branch signal.
Further, a detector detects a strength of an output signal of the first adder, and a control circuit controls the first non-linear characteristics, an attenuation amount of the variable attenuator and a phase amount of the variable phase shifter in accordance with an output signal of the detector.
CA002220922A 1996-11-13 1997-11-12 Automatic predistortion adjusting circuit having stable non-linear characteristics regardless of input signal frequency Expired - Fee Related CA2220922C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8-301789 1996-11-13
JP8301789A JPH10145161A (en) 1996-11-13 1996-11-13 Pre-distortion automatic adjustment circuit

Publications (2)

Publication Number Publication Date
CA2220922A1 true CA2220922A1 (en) 1998-05-13
CA2220922C CA2220922C (en) 2002-01-01

Family

ID=17901203

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002220922A Expired - Fee Related CA2220922C (en) 1996-11-13 1997-11-12 Automatic predistortion adjusting circuit having stable non-linear characteristics regardless of input signal frequency

Country Status (5)

Country Link
US (1) US5963090A (en)
JP (1) JPH10145161A (en)
KR (1) KR100267202B1 (en)
CA (1) CA2220922C (en)
SE (1) SE519530C2 (en)

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US6759902B2 (en) * 2002-03-25 2004-07-06 Andrew Corporation Single-detector automatic gain control circuit
US6700439B2 (en) 2002-04-11 2004-03-02 Andrew Corporation Zero-bias bypass switch
US6812786B2 (en) 2002-04-11 2004-11-02 Andrew Corporation Zero-bias bypass switching circuit using mismatched 90 degrees hybrid
US7403573B2 (en) * 2003-01-15 2008-07-22 Andrew Corporation Uncorrelated adaptive predistorter
JP4716306B2 (en) * 2003-03-24 2011-07-06 三菱電機株式会社 Predistorter
US7259630B2 (en) * 2003-07-23 2007-08-21 Andrew Corporation Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter
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Also Published As

Publication number Publication date
SE9704124D0 (en) 1997-11-11
KR100267202B1 (en) 2000-10-16
CA2220922C (en) 2002-01-01
SE9704124L (en) 1998-05-14
KR19980042391A (en) 1998-08-17
SE519530C2 (en) 2003-03-11
US5963090A (en) 1999-10-05
JPH10145161A (en) 1998-05-29

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Effective date: 20131113