KR970031269A - One band cancellation filter to expand the bandwidth of the bandpass filter - Google Patents

One band cancellation filter to expand the bandwidth of the bandpass filter Download PDF

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Publication number
KR970031269A
KR970031269A KR1019950042279A KR19950042279A KR970031269A KR 970031269 A KR970031269 A KR 970031269A KR 1019950042279 A KR1019950042279 A KR 1019950042279A KR 19950042279 A KR19950042279 A KR 19950042279A KR 970031269 A KR970031269 A KR 970031269A
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KR
South Korea
Prior art keywords
terminal
ota
filter
bandwidth
diode
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KR1019950042279A
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Korean (ko)
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KR0154808B1 (en
Inventor
김병일
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김광호
삼성전자 주식회사
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Priority to KR1019950042279A priority Critical patent/KR0154808B1/en
Publication of KR970031269A publication Critical patent/KR970031269A/en
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Publication of KR0154808B1 publication Critical patent/KR0154808B1/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/547—Notch filters, e.g. notch BAW or thin film resonator filters

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Networks Using Active Elements (AREA)

Abstract

본 발명은 BPF 대역폭을 확장시킬 수 있도록 한 BRF에 관한 것으로, 각각의 트랜스콘덕턴스를 갖는 제1, 제2OTA와 제1, 제2저항 및 제1, 제2커패시터로 구성되었으며, BPF와 BRF가 동시에 내장된 회로에서 전체 필터 특성상의 BPF 대역폭을 크게 확장시킴으로써, 중심 주파수의 민감도를 개선하며 동시에 외부에서 중심 주파수의 조정이 용이하도록 한 BPF 대역폭을 확장시킬 수 있도록 한 BRF에 관한 것이다.The present invention relates to a BRF to expand the BPF bandwidth, and comprises a first, a second OTA and a first, a second resistor and a first, a second capacitor having a transconductance, respectively, the BPF and BRF At the same time, it is related to a BRF that greatly expands the BPF bandwidth of the overall filter characteristics in the built-in circuit, thereby improving the sensitivity of the center frequency and at the same time allowing the BPF bandwidth to be easily adjusted from the outside.

Description

대역 통과 필터의 대역폭을 확장시킬 수 있도록 한 대역 소거 필터One band cancellation filter to expand the bandwidth of the bandpass filter

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

제1도는 종래 대역 소거 필터(Band Reject Filter)의 등가 회로도이고,1 is an equivalent circuit diagram of a conventional band reject filter.

제2도는 본 발명의 실시예에 따른, 전체 필터(Overall Filter; 대역 통과 필터(이하 BPF)와 대역 소거 필터(이하 BRF)) 특성에서 BPF 대역폭을 확장시킬 수 있도록 한 BRF의 등가 회로도이고,FIG. 2 is an equivalent circuit diagram of a BRF in which an BPF bandwidth can be extended in characteristics of an overall filter (hereinafter referred to as BPF) and a band cancellation filter (hereinafter referred to as BRF) according to an embodiment of the present invention.

제3도는 종래 BRF의 상세 회로도이고,3 is a detailed circuit diagram of a conventional BRF,

제4도는 본 발명의 실시예에 따른 BPF 대역폭을 확장시킬 수 있도록 한 BRF의 상세 회로도이고,4 is a detailed circuit diagram of a BRF to extend the BPF bandwidth according to an embodiment of the present invention,

제5도의 (a), (b)는 종래 BRF를 사용했을때, 통과 대역폭에 따른 이득의 변화를 나타낸 그래프이다.(A) and (b) of FIG. 5 are graphs showing a change in gain according to a pass bandwidth when a conventional BRF is used.

Claims (2)

각각의 트랜스콘덕턴스를 갖는 제1, 제2OTA와 제1, 제2, 제3저항과 제1, 제2커패시터 및 제1, 제2다이오드로 이루어져 있는데, 상기 제1OTA는 필터 입력 신호를 비반전 입력으로 받고, 상기 제1, 제2저항의 접속점에 인가되는 전압을 반전 입력으로 받도록 연결되어 있고, 상기 제2OTA는, 상기 제1OTA의 출력 신호를 비반전 입력으로 받고, 접지단에 반전 입력 단자가 연결되어 있으며, 상기 제1, 제2저항은, 상기 제2OTA의 출력 신호(필터 출력 신호)를 저항비에 의해 분압할 수 있도록 제2OTA의 출력 단자와 접지단 사이에 직렬로 연결되어 있으며, 상기 제1다이오드의 애노드 단자는 제2다이오드의 캐소드 단자와 공통단자로 연결되고, 상기 제1다이오드의 캐소드 단자는 제2다이오드의 애노드 단자와 공통 단자로 연결되어, 하나의 공통 단자가 상기 제1, 제2저항의 접속점에 연결되어 있으며, 상기 제3저항은, 상기 제1, 제2다이오드의 다른 하나의 공통 단자와 상기 제2OTA의 출력 단자 사이에 연결되어 있으며, 상기 제1커패시터는 상기 제1OTA의 출력 단자와 접지단 사이에 연결되고, 상기 제2커패시터는 상기 제2OTA의 출력 단자와 제1OTA의 비반전 입력 단자 사이에 연결되어 있는 형태로 구성되어 있는 것을 특징으로 하는 BPF 대역폭을 확장시킬 수 있도록 한 BRF.Each of the first and second OTAs having a transconductance, the first and second resistors, the first and second capacitors, and the first and second diodes, wherein the first OTA non-inverts the filter input signal. It is connected to receive as an input, the voltage applied to the connection point of the first and second resistors as an inverting input, wherein the second OTA receives the output signal of the first OTA as a non-inverting input, the inverting input terminal at The first and second resistors are connected in series between the output terminal of the second OTA and the ground terminal to divide the output signal (filter output signal) of the second OTA by a resistance ratio. The anode terminal of the first diode is connected to the common terminal of the cathode of the second diode, the cathode terminal of the first diode is connected to the common terminal of the anode of the second diode, one common terminal is connected to the first terminal Contact of the second resistor The third resistor is connected between the other common terminal of the first and second diodes and the output terminal of the second OTA, and the first capacitor is connected to the output terminal of the first OTA. And a second capacitor connected between a ground terminal, and configured to be connected between an output terminal of the second OTA and a non-inverting input terminal of the first OTA. 제1항에 있어서, 상기 제2저항은, 저항값의 조정을 통해서 필터의 극점을 제어할 수 있는 기능을 갖는 것을 특징으로 하는 BPF 대역폭을 확장시킬 수 있도록 한 BRF.The BRF of claim 1, wherein the second resistor has a function of controlling a pole of the filter by adjusting a resistance value. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950042279A 1995-11-20 1995-11-20 Overall band reject filter KR0154808B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950042279A KR0154808B1 (en) 1995-11-20 1995-11-20 Overall band reject filter

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Application Number Priority Date Filing Date Title
KR1019950042279A KR0154808B1 (en) 1995-11-20 1995-11-20 Overall band reject filter

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KR970031269A true KR970031269A (en) 1997-06-26
KR0154808B1 KR0154808B1 (en) 1998-12-15

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