KR940023006A - Feedback Linearization Circuit of Power Amplifier - Google Patents

Feedback Linearization Circuit of Power Amplifier Download PDF

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Publication number
KR940023006A
KR940023006A KR1019930004881A KR930004881A KR940023006A KR 940023006 A KR940023006 A KR 940023006A KR 1019930004881 A KR1019930004881 A KR 1019930004881A KR 930004881 A KR930004881 A KR 930004881A KR 940023006 A KR940023006 A KR 940023006A
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KR
South Korea
Prior art keywords
power amplifier
linearization
power
amplifier
signal
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Application number
KR1019930004881A
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Korean (ko)
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KR950003277B1 (en
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박종호
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김주용
현대전자산업 주식회사
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Application filed by 김주용, 현대전자산업 주식회사 filed Critical 김주용
Priority to KR1019930004881A priority Critical patent/KR950003277B1/en
Publication of KR940023006A publication Critical patent/KR940023006A/en
Application granted granted Critical
Publication of KR950003277B1 publication Critical patent/KR950003277B1/en

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    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
    • H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
    • H03F2201/3227—Adaptive predistortion based on amplitude, envelope or power level feedback from the output of the main amplifier

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

Abstract

본 발명은 베이스 밴드 신호를 이용하여 고주파 변조성분을 제거한 전력증폭기의 피드백 선형화 회로에 관한 것으로, 전력증폭기 선형화(Power Amplifier Linearization)는 전력증폭기가 보다 높은 출력전력에서 동작할 수 있도록 하는 효과적인 방법으로, 선형화가 없다면 상호 변조잡음(Intermodulation Noise), 주파수 확산(Spectrum Spreading), 비트 에러 레이트(Bit Error Rate)등과 같은, 시스템 규정조건을 맞추려면 전력증폭기를 백-오프(backed-off)모드에서 동작시킬 필요가 있다. 여기서 백-오프 모드란 증폭기의 동작점을 포화출력 전력보다 낮은점에서 동작시키는 것으로 , 둘 이상의 반송파를 동시에 증폭하는 경우 증폭기의 비선형 외곡(non linear distortion)에 의한 상호 변조성분을 줄이기 위한 방법이다. 그러나 선형화가 이루어진다면 동작(operating) 출력전력에 있어 전력증폭기 출력이 5-6[dB]증가하게 된다. 이외에도 선형화에 의해 파워효율(power efficency)이 매우 좋아지므로 800[MHz] 대역의 디지탈 셀룰라나 1.8[GHz] 대역의 개인 통신망 (Personal Communication Network)과 같은 디지탈시스템에서는 전력증폭기의 선형화가 매우 중요한 설계 파라메터(parameter)로 된다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feedback linearization circuit of a power amplifier that removes high frequency modulation by using a baseband signal. Power amplifier linearization is an effective method for allowing a power amplifier to operate at a higher output power. Without linearization, the power amplifier can be operated in backed-off mode to meet system requirements, such as intermodulation noise, spectrum spreading, and bit error rate. There is a need. Here, the back-off mode is to operate the operating point of the amplifier at a lower point than the saturation output power, and when amplifying two or more carriers at the same time is a method for reducing the intermodulation component caused by the non-linear distortion of the amplifier. However, if linearization is done, the power amplifier output will increase 5-6 [dB] in operating output power. In addition, power efficiency is greatly improved by linearization, so linearization of power amplifier is very important design parameter in digital systems such as 800 [MHz] band digital cellular or 1.8 [GHz] band personal communication network. (parameter).

Description

전력증폭기의 피드백 선형화 회로Feedback Linearization Circuit of Power Amplifier

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명 전력증폭기의 피드백 선형화 회로도이다.2 is a feedback linearization circuit diagram of the power amplifier of the present invention.

Claims (1)

고주파 입력(RF IN)단자를 통해 입력된 베이스밴드 신호의 위상변조파를 주파수 변조파로 변환하는 전치보상기(1)와; 전기적 진동을 발생시키는 발진기(2)와; 이 발진기(2)에서 발생된 발진파형을 상기 전치보상기(1)에서 변환된 베이스밴드 신호에 의해 변조하는 변조기(3)와; 이 변조기(3)에서 변조된 신호를 증폭하는 전력증폭기(4)와; 이 전력증폭기(4)에서 증폭된 출력신호를 궤환시키는 결합기(5)와; 상기 발진기(2)에서 발생된 발진파형의 위상을 조정하는 위상천이기(6)와; 이 위상천이기(6)에서 미조정된 발진신호 및 상기 결합기(5)에서 궤환된 출력신호를 복조하는 복조기(7)와; 이 복조기(7)에서 복조된 신호 및 상기 전치보상기(1)에서 변환된 베이스밴드 신호를 비교하는 비교기(8)와; 이 비교기(8)에서 비교출력된 신호에 의해 상기 전치보상기(1)를 제어하는 제어기(9)로 구성함을 특징으로 하는 전력증폭기의 피드백 선형화 회로.A predistorter 1 for converting a phase modulated wave of a baseband signal input through an RF IN terminal into a frequency modulated wave; An oscillator 2 for generating electrical vibrations; A modulator (3) for modulating the oscillation waveform generated by the oscillator (2) by the baseband signal converted by the predistorter (1); A power amplifier 4 for amplifying the signal modulated by the modulator 3; A combiner 5 for feeding back the output signal amplified by the power amplifier 4; A phase shifter (6) for adjusting the phase of the oscillation waveform generated by the oscillator (2); A demodulator (7) for demodulating the finely tuned oscillation signal in the phase shifter (6) and the output signal fed back from the combiner (5); A comparator (8) for comparing the demodulated signal in the demodulator (7) and the baseband signal converted in the predistorter (1); And a controller (9) for controlling the predistorter (1) by a signal output from the comparator (8). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930004881A 1993-03-27 1993-03-27 Feedback linearizating circuit for power amplifier KR950003277B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930004881A KR950003277B1 (en) 1993-03-27 1993-03-27 Feedback linearizating circuit for power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930004881A KR950003277B1 (en) 1993-03-27 1993-03-27 Feedback linearizating circuit for power amplifier

Publications (2)

Publication Number Publication Date
KR940023006A true KR940023006A (en) 1994-10-22
KR950003277B1 KR950003277B1 (en) 1995-04-07

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ID=19352886

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930004881A KR950003277B1 (en) 1993-03-27 1993-03-27 Feedback linearizating circuit for power amplifier

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KR (1) KR950003277B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000047846A (en) * 1998-12-30 2000-07-25 윤종용 Adaptive digital pre-distortion correction apparatus for use in a transmitter in a digital communication system and method of operation
KR100291146B1 (en) * 1998-06-05 2001-07-12 정명식 Linear power amplifier
KR100458998B1 (en) * 1995-12-29 2005-02-28 퀄컴 인코포레이티드 Out-of-band compensation for non-linear device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100458998B1 (en) * 1995-12-29 2005-02-28 퀄컴 인코포레이티드 Out-of-band compensation for non-linear device
KR100291146B1 (en) * 1998-06-05 2001-07-12 정명식 Linear power amplifier
KR20000047846A (en) * 1998-12-30 2000-07-25 윤종용 Adaptive digital pre-distortion correction apparatus for use in a transmitter in a digital communication system and method of operation

Also Published As

Publication number Publication date
KR950003277B1 (en) 1995-04-07

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