KR940012818A - Filter circuit - Google Patents

Filter circuit Download PDF

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Publication number
KR940012818A
KR940012818A KR1019930023664A KR930023664A KR940012818A KR 940012818 A KR940012818 A KR 940012818A KR 1019930023664 A KR1019930023664 A KR 1019930023664A KR 930023664 A KR930023664 A KR 930023664A KR 940012818 A KR940012818 A KR 940012818A
Authority
KR
South Korea
Prior art keywords
input terminal
resistor
conductance amplifier
terminal
amplifier
Prior art date
Application number
KR1019930023664A
Other languages
Korean (ko)
Inventor
유타카 미타니
히데히코 아오키
Original Assignee
사또오 후미오
가부시기가이샤 도시바
나카무라 노부히데
도시바 에이. 브이. 이 가부시기가이샤
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 사또오 후미오, 가부시기가이샤 도시바, 나카무라 노부히데, 도시바 에이. 브이. 이 가부시기가이샤 filed Critical 사또오 후미오
Publication of KR940012818A publication Critical patent/KR940012818A/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
    • H03F3/45098—PI types
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
    • H03F3/45197—Pl types
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/0422—Frequency selective two-port networks using transconductance amplifiers, e.g. gmC filters
    • H03H11/0433—Two integrator loop filters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Networks Using Active Elements (AREA)

Abstract

차동 출력형 증폭기 등에 노이즈로서 발생하는 동상 신호 성분을 높은 동상제거비(CMRR)로 제거할 수 있는 필터회로를 얻는다. 능동 필터를 구성하는 앞단의 콘덕턴스 앰프(G1)의 정상 입력 단자를 제1의 저항기(R1)를 통해 제1의 입력단자 (IN1)에 접속하는 동시에 제2의 저항기(R2)를 통해 접지점에 접속하는 한편, 제1의 콘덕턴스 앰프(G1)의 역상 입력 단자를 제3의 저항기(R3)를 통해 제2의 입력단자 (IN2)에 접속하는 동시에 제4의 저항기를 통해 외부 출력 단자에 접속하고, 더구나 제1 및 제2의 저항기의 저항치비와 제3 및 제4의 저항기의 저항치비를 같게 하여, 동상 신호 성분을 포함하는 한쪽의신호를 제1의 입력단자 (IN1)에 다른쪽의 신호를 제2의 입력단자 (IN2)에 각기 가하도록 한 것이다.A filter circuit capable of removing in-phase signal components generated as noise in a differential output amplifier or the like with a high in-phase rejection ratio (CMRR) is obtained. The normal input terminal of the front conductance amplifier G 1 constituting the active filter is connected to the first input terminal IN 1 through the first resistor R 1 and at the same time, the second resistor R 2 is provided. While connecting the reverse phase input terminal of the first conductance amplifier G 1 to the second input terminal IN 2 via the third resistor R 3 , while simultaneously connecting the Connected to an external output terminal, and the resistance ratios of the first and second resistors are equal to the resistance ratios of the third and fourth resistors so that one signal including the in-phase signal component is connected to the first input terminal. The other signal to (IN 1 ) is applied to the second input terminal (IN 2 ).

Description

필터회로Filter circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명의 일 실시예의 구성을 나타낸 회로도,1 is a circuit diagram showing the configuration of an embodiment of the present invention;

제2도는 본 발명의 일 실시예의 구체적인 구성을 나타낸 회로도,2 is a circuit diagram showing a specific configuration of an embodiment of the present invention,

제3도는 본 발명의 다른 실시예의 구성을 나타낸 회로도.3 is a circuit diagram showing the configuration of another embodiment of the present invention.

Claims (2)

출력 단자가 직접 또는 간접적으로 외부 출력단자(OUT)에 접속된 콘덕턴스 앰프(G1)와, 일단이 상기 콘덕턴스 앰프의 출력단자에 접속되고 타단이 접지된 콘덴서(C)와, 일단이 제1의 입력단자(IN1)에 접속되고 타단이 상기 콘덕턴스 앰프의 정상 입력 단자에 접속된 제1의 저항기(R1)와, 일단이 상기 콘덕턴스 앰프의 정상 입력 단자에 접속되고 타단이 접지된 제2의 저항기(R2)와, 일단이 제2의 입력단자 (IN2)에 접속되고 타단이 상기 콘덕턴스 앰프의 역상 입력단자에 접속된 제3의 저항기(R3)와, 일단이 콘덕턴스 앰프의 역상 입력 단자에 접속되고 타단이 상기 외부 출력 단자에 접속된 제4의 저항기(R4)를 구비하며, 상기 제1 및 제2의 저항기의 저항치비와 상기 제3 및 제4의 저항기의 저항치비를 같게 한 것을 특징으로 하는 필터회로.A conductance amplifier G 1 having an output terminal directly or indirectly connected to an external output terminal OUT, a capacitor C having one end connected to an output terminal of the conductance amplifier and the other end grounded, A first resistor (R 1 ) connected to the input terminal (IN 1 ) of 1 and the other end connected to the normal input terminal of the conductance amplifier, and one end connected to the normal input terminal of the conductance amplifier, and the other end to ground The second resistor R 2 , one end connected to the second input terminal IN 2 , and the other end connected to the third resistor R 3 connected to the reverse phase input terminal of the conductance amplifier. A fourth resistor R 4 connected to the reverse phase input terminal of the conductance amplifier and the other end connected to the external output terminal, wherein the resistance ratios of the first and second resistors and the third and fourth A filter circuit comprising the same resistance ratio of a resistor. 제1의 콘덕턴스 앰프와, 일단이 상기 제1의 콘덕턴스 앰프의 출력단자에 접속되고 타단이 접지된 콘덴서(C1)와, 출력단자가 직접 또는 간접적으로 외부 출력단자(OUT)에 접속되고, 정상 입력단자가 상기 제1의 콘덕턴스 앰프의 출력단자에 직접 또는 간접적으로 접속되며, 역상 입력단자가 상기 외부 출력단자에 접속된 제2의 콘덕턴스 앰프(G2)와, 일단이 상기 제2의 콘덕턴스 앰프의 출력단자에 접속되고 타단이 접지된 제2의 콘덴서(C2)와, 일단이 제1의 입력단자(IN1)에 접속되고 타단이 상기 제1의 콘덕턴스 앰프의 정상 입력 단자에 접속된제1의 저항기(R1)와, 일단이 상기 제1의 콘덕턴스 앰프의 정상 입력단자에 접속되고 타단이 접지된 제2의 저항기(R2)와, 일단이 제2의 입력단자 (IN2)에 접속되고, 타단이 상기 제1의 콘덕턴스 앰프의 역상 입력단자에 접속된 제3의 저항기(R3)와, 일단이 상기 제1의 콘덕턴스 앰프의 역상 입력단자에 접속되고 타단이 상기 외부 출력 단자에 접속된 제4의 저항기(R4)를 구비하며, 상기 제1 및 제2의 저항기의 저항치보다 상기 제3 및 제4의 저항기의 저항치비를 같게 한 것을 특징으로 하는 필터회로.Which is connected to one of the transconductance amplifiers, one end is connected to the output terminal of the first transconductance amplifier 1 and the other end is a ground capacitor (C 1) and the output terminal either directly or indirectly to the external output terminal (OUT), A second conductance amplifier G 2 having a normal input terminal connected directly or indirectly to an output terminal of the first conductance amplifier, a reverse phase input terminal connected to the external output terminal, and one end of the second conductance amplifier G 2 ; The second capacitor C 2 connected to the output terminal of the conductance amplifier of the second end and grounded at the other end thereof, and one end thereof connected to the first input terminal IN 1 , and the other end thereof is the normal input of the first conductance amplifier. A first resistor R 1 connected to the terminal, one end of the second resistor R 2 connected to the normal input terminal of the first conductance amplifier and the other end grounded, and one end of the second input; is connected to the terminal (iN 2), the other end opposite-phase input terminal of the transconductance amplifier of the first And a resistor (R 3) of the third connection on one end and is provided with a resistor (R 4) of the fourth connecting the first is connected to the reverse phase input terminal of the transconductance amplifier of one another end to said output terminals, And a resistance ratio of the third and fourth resistors equal to that of the first and second resistors. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930023664A 1992-11-12 1993-11-09 Filter circuit KR940012818A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP92-302525 1992-11-12
JP04302525A JP3108551B2 (en) 1992-11-12 1992-11-12 Filter circuit

Publications (1)

Publication Number Publication Date
KR940012818A true KR940012818A (en) 1994-06-24

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ID=17910018

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930023664A KR940012818A (en) 1992-11-12 1993-11-09 Filter circuit

Country Status (3)

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JP (1) JP3108551B2 (en)
KR (1) KR940012818A (en)
GB (1) GB2272812B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0633714U (en) * 1992-10-09 1994-05-06 関東自動車工業株式会社 Car door compartment
US7272187B2 (en) 2002-11-01 2007-09-18 Matsushita Electric Industrial Co., Ltd. Filter circuit and radio apparatus
JP5070918B2 (en) * 2007-05-01 2012-11-14 富士通セミコンダクター株式会社 Analog signal selection circuit
US8049562B2 (en) * 2010-01-07 2011-11-01 Texas Instruments Incorporated Amplifier with improved input resistance and controlled common mode

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832646A (en) * 1972-10-06 1974-08-27 Westinghouse Electric Corp Common mode noise suppressing circuit adjustment sequence

Also Published As

Publication number Publication date
GB9323431D0 (en) 1994-01-05
JPH06152318A (en) 1994-05-31
GB2272812A (en) 1994-05-25
GB2272812B (en) 1996-01-10
JP3108551B2 (en) 2000-11-13

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E601 Decision to refuse application