KR970055257A - Linear amplifier - Google Patents

Linear amplifier Download PDF

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Publication number
KR970055257A
KR970055257A KR1019950051482A KR19950051482A KR970055257A KR 970055257 A KR970055257 A KR 970055257A KR 1019950051482 A KR1019950051482 A KR 1019950051482A KR 19950051482 A KR19950051482 A KR 19950051482A KR 970055257 A KR970055257 A KR 970055257A
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KR
South Korea
Prior art keywords
output
amplifier
coupler
signal
time delay
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KR1019950051482A
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Korean (ko)
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KR0148454B1 (en
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홍헌진
강상기
박재홍
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양승택
한국전자통신연구원
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Priority to KR1019950051482A priority Critical patent/KR0148454B1/en
Publication of KR970055257A publication Critical patent/KR970055257A/en
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Publication of KR0148454B1 publication Critical patent/KR0148454B1/en

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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
    • H03F1/3223—Modifications of amplifiers to reduce non-linear distortion using feed-forward
    • H03F1/3229—Modifications of amplifiers to reduce non-linear distortion using feed-forward using a loop for error extraction and another loop for error subtraction
    • 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
    • H03F2201/3218—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion the main amplifier or error amplifier being a feedforward amplifier

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

Abstract

본 발명은 선형증폭기에 관한 것으로, AB급 증폭기를 구동증폭기로 사용함으로써 발생하는 왜곡 성분을 구동증폭기에 피드 포워드(feed foward)방식의 선형회 회로를 부착시켜 억제해 주면서, 주증폭기에는 일부러 구동증폭기의 왜곡 신호를 전치 입력시켜 주증폭기의 선형성을 개선해 주는 것을 특징으로 하여, 증폭기의 선형성을 향상시킬 수 있으며 특히 전력효율이 좋다는 것과, QPSK와 같이 위상 변조 방식을 사용하는 시스템에 적용할 경우 선형 증폭으로 인해 위상 왜곡을 줄일 수 있는 효과가 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a linear amplifier, wherein a distortion caused by using a class AB amplifier as a drive amplifier is suppressed by attaching a feed-forward linear circuit to the drive amplifier. It is characterized by improving the linearity of the main amplifier by pre-input of the distortion signal of the amplifier, which can improve the linearity of the amplifier, especially the power efficiency is good, and linear amplification when applied to a system using a phase modulation method such as QPSK. As a result, phase distortion can be reduced.

Description

선형증폭기(Linearizer Amplifier)Linearizer Amplifier

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

제1도는 본 발명에 의한 선형증폭기의 블록도.1 is a block diagram of a linear amplifier according to the present invention.

제2도는 본 발명에 의한 선형증폭기의 각 점에서의 주파수 스펙트럼을 도시한 도면.2 is a diagram showing the frequency spectrum at each point of the linear amplifier according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1,3,8,12 : 커플러 2 : 구동증폭기(AB급)1,3,8,12: Coupler 2: Drive amplifier (AB class)

4,7,9 : 시간 지연기 5,11 : 빼기 회로4,7,9: time delay 5,11: subtraction circuit

6 : 주 증폭기(AB급) 10,13,15 : 위상변환기와 가변 감쇠기6: main amplifier (AB class) 10,13,15: phase shifter and variable attenuator

14 : 보조증폭기(A급) 16 : 오차증폭기(A급)14: auxiliary amplifier (class A) 16: error amplifier (class A)

Claims (3)

입력신호를 입력받아 증폭기 경로와 선형화 경로로 입력 신호를 분리하기 위한 제1커플러; 상기 제1커플러로부터 증폭기 경로로 분리된 입력신호를 입력받아 증폭하여, 증폭된 상기 입력신호와 왜곡신호를 함께 출력하는 AB급의 구동증폭기(AB급); 상기 구동증폭기의 출력 신호중의 대부분의 전력은 증폭기 경로로 전달하고 작은 전력을 분리하여 선형화 경로로 보내는 제2커플러; 상기 제1커플러에서 분리된 입력신호의 일부를 입력받아 시간 지연된 신호를 출력하기 위한 제1시간 지연기; 상기 제1시간 지연기의 출력을 입력받아 신호 레벨을 조절하기 위한 제1가변감쇠기; 상기 제1가변감쇠기의 출력신호와 상기 제2커플러의 출력 신호를 입력받아, 상기 제2커플러의 출력에서 상기 제1가변감쇠기의 출력을 빼서 왜곡신호만 출력하는 제1빼기회로; 상기 제1빼기회로의 출력을 입력받아 일부를 증폭기 경로로 보내는 제3커플러; 상기 제3커플러의 출력을 입력받아 신호 레벨을 조절하기 위한 제2가변감쇠기; 상기 제2가변 감쇠기의 출력을 입력받아 증폭하는 A급의 보조 증폭기; 상기 제2시간 지연기의 출력과 상기 보조증폭기의 출력을 입력받아, 상기 제2시간 지연기의 출력에서 상기 보조증폭기의 출력을 빼는 제2빼기회로; 상기 제2배기 회로의 출력을 입력받아서 증폭하여 출력하는 AB급의 주증폭기; 상기 주증폭기의 출력을 입력받아 시간 지연을 주기 위한 제3시간 지연기; 상기 제3커플러의 출력을 입력받아 신호 레벨을 조절하기 위한 제3가변 감쇠기; 상기 제3가변 감쇠기의 출력을 입력받아서, 증폭하여 출력하는 A급의 오차증폭기; 상기 제3시간지연기의 출력과 상기 오차증폭기의 출력을 입력받아서 결합시켜 출력하는 제3커플러로 구성되는 것을 특징으로 하는 선형증폭기.A first coupler for receiving the input signal and separating the input signal into an amplifier path and a linearization path; A class AB driving amplifier (AB class) for receiving and amplifying an input signal separated from the first coupler through an amplifier path and outputting the amplified input signal and a distortion signal together; A second coupler for transferring most of the power in the output signal of the driving amplifier to the amplifier path and separating small power into the linearization path; A first time delay unit for receiving a portion of the input signal separated from the first coupler and outputting a time delayed signal; A first variable attenuator configured to receive an output of the first time delay and adjust a signal level; A first subtraction circuit receiving the output signal of the first variable attenuator and the output signal of the second coupler, subtracting the output of the first variable attenuator from the output of the second coupler, and outputting only a distortion signal; A third coupler that receives an output of the first subtracting circuit and sends a portion to an amplifier path; A second variable attenuator configured to receive an output of the third coupler and adjust a signal level; An auxiliary amplifier of class A for receiving and amplifying the output of the second variable attenuator; A second subtraction circuit receiving the output of the second time delay and the output of the auxiliary amplifier and subtracting the output of the auxiliary amplifier from the output of the second time delay; A main amplifier of class AB that receives the output of the second exhaust circuit and amplifies and outputs the output; A third time delay for receiving the output of the main amplifier and giving a time delay; A third variable attenuator configured to receive an output of the third coupler and adjust a signal level; A class A error amplifier which receives the output of the third variable attenuator, amplifies and outputs the output; And a third coupler configured to receive the output of the third time delay unit and the output of the error amplifier, and combine and output the combined output. 제1항에 있어서, 상기 제1시간지연기는, 상기 제1시간지연기를 경우하여 상기 제1가변감쇠기에서 출력되는 신호와 상기 제2커플러에서 출력되는 신호 사이에 같은 시간 지연을 갖도록 하는 것을 특징으로 하는 선형증폭기.The method of claim 1, wherein the first time delay unit has the same time delay between the signal output from the first variable attenuator and the signal output from the second coupler in the case of the first time delay unit. Linear amplifier. 제1항에 있어서, 상기 제1가변감쇠기는, 상기 제1가변감쇠기의 출력과 상기 제2커플러의 출력 중에서 상기 입력신호에 해당하는 신호의 크기가 동일하도록 제1시간지연기의 출력신호의 크기를 감쇠하는 것을 특징으로 하는 선형증폭기.The output signal of the first time delay unit according to claim 1, wherein the first variable attenuator has a magnitude equal to a signal corresponding to the input signal among an output of the first variable attenuator and an output of the second coupler. A linear amplifier characterized in that the attenuation. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950051482A 1995-12-18 1995-12-18 Linear amplifier KR0148454B1 (en)

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Application Number Priority Date Filing Date Title
KR1019950051482A KR0148454B1 (en) 1995-12-18 1995-12-18 Linear amplifier

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Application Number Priority Date Filing Date Title
KR1019950051482A KR0148454B1 (en) 1995-12-18 1995-12-18 Linear amplifier

Publications (2)

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KR970055257A true KR970055257A (en) 1997-07-31
KR0148454B1 KR0148454B1 (en) 1998-12-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100309808B1 (en) * 1996-07-23 2001-09-29 스펙트리안 Rf amplifier having adaptative predistortion circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100309808B1 (en) * 1996-07-23 2001-09-29 스펙트리안 Rf amplifier having adaptative predistortion circuit

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