ES2129681T3 - Circuito de filtro. - Google Patents

Circuito de filtro.

Info

Publication number
ES2129681T3
ES2129681T3 ES95100993T ES95100993T ES2129681T3 ES 2129681 T3 ES2129681 T3 ES 2129681T3 ES 95100993 T ES95100993 T ES 95100993T ES 95100993 T ES95100993 T ES 95100993T ES 2129681 T3 ES2129681 T3 ES 2129681T3
Authority
ES
Spain
Prior art keywords
beta
square root
theta
resonance frequency
differential amplifier
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.)
Expired - Lifetime
Application number
ES95100993T
Other languages
English (en)
Inventor
Nobukazu Hosoya
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Application granted granted Critical
Publication of ES2129681T3 publication Critical patent/ES2129681T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H03H11/0466—Filters combining transconductance amplifiers with other active elements, e.g. operational amplifiers, transistors, voltage conveyors
    • 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

Landscapes

  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)

Abstract

UN CIRCUITO DE FILTRADO QUE INCLUYE UN AMPLIFICADOR DIFERENCIAL QUE TIENE UNA CONDUCTANCIA MUTUA DE GM1 Y UN TRANSISTOR T1 QUE ATENUA UNA CORRIENTE DE SALIDA DEL AMPLIFICADOR DIFERENCIAL EN 1/(BETA) ((BETA) ES UN FACTOR DE AMPLIFICACION DE CORRIENTE) COLOCADO EN UNA ETAPA QUE SUCEDE AL AMPLIFICADOR DIFERENCIAL CON LO QUE LOS TERMINOS DE GM1 EN ECUACIONES REPRESENTATIVAS DE UNA FRECUENCIA DE RESONANCIA W(THETA) Y UN FACTOR DE CALIDAD Q RESPECTIVAMENTE SE MULTIPLICAN POR 1/(BETA) RESPECTIVAMENTE. PUESTO QUE EL TERMINO DE GM1 EXISTE EN UN NUMERADOR QUE SE ENCUENTRA DENTRO DE UN SIMBOLO DE RAIZ ( (RAIZ CUADRADA) ) DE LA ECUACION REPRESENTATIVA DE LA FRECUENCIA DE RESONANCIA W(THETA), AL COLOCAR EL TRANSISTOR T1, LA FRECUENCIA DE RESONANCIA W(THETA) SE PUEDE REDUCIR 1/ (RAIZ CUADRADA) (BETA) VECES. ADEMAS, PUESTO QUE EL TERMINO DE GM1 EXISTE EN UN DENOMINADOR QUE SE ENCUENTRA DENTRO DE UN SIMBOLO DE RAIZ ( (RAIZ CUADRADA) ) DE LA ECUACION REPRESENTATIVA DEL FACTOR DE CALIDAD Q, AL COLOCAR EL TRANSISTOR T1, EL FACTOR DE CALIDAD SE PUEDE AUMENTAR (RAIZ CUADRADA) (BETA) VECES.
ES95100993T 1994-01-26 1995-01-25 Circuito de filtro. Expired - Lifetime ES2129681T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6006958A JP3005413B2 (ja) 1994-01-26 1994-01-26 フィルタ回路

Publications (1)

Publication Number Publication Date
ES2129681T3 true ES2129681T3 (es) 1999-06-16

Family

ID=11652740

Family Applications (1)

Application Number Title Priority Date Filing Date
ES95100993T Expired - Lifetime ES2129681T3 (es) 1994-01-26 1995-01-25 Circuito de filtro.

Country Status (5)

Country Link
US (1) US5610551A (es)
EP (1) EP0665646B1 (es)
JP (1) JP3005413B2 (es)
DE (1) DE69508634T2 (es)
ES (1) ES2129681T3 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3151376B2 (ja) * 1995-04-26 2001-04-03 株式会社東芝 フィルタ回路
JP3151385B2 (ja) * 1995-06-29 2001-04-03 株式会社東芝 アクティブフィルタ
US6194958B1 (en) * 1999-09-30 2001-02-27 Analog Devices, Inc. Filter having minimized cut-off frequency variations

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2538037B2 (ja) * 1989-03-17 1996-09-25 松下電器産業株式会社 フィルタ回路
US5001441A (en) * 1989-10-30 1991-03-19 Allied-Signal Inc. Operational transconductance amplifier programmable filter
DE4038111A1 (de) * 1990-11-29 1992-06-04 Thomson Brandt Gmbh Universalfilter
JPH0563505A (ja) * 1991-08-30 1993-03-12 Matsushita Electric Ind Co Ltd フイルタ回路

Also Published As

Publication number Publication date
EP0665646A1 (en) 1995-08-02
DE69508634T2 (de) 1999-10-28
JPH07212188A (ja) 1995-08-11
EP0665646B1 (en) 1999-03-31
JP3005413B2 (ja) 2000-01-31
DE69508634D1 (de) 1999-05-06
US5610551A (en) 1997-03-11

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