WO2024013834A1 - フィルタ回路 - Google Patents

フィルタ回路 Download PDF

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Publication number
WO2024013834A1
WO2024013834A1 PCT/JP2022/027333 JP2022027333W WO2024013834A1 WO 2024013834 A1 WO2024013834 A1 WO 2024013834A1 JP 2022027333 W JP2022027333 W JP 2022027333W WO 2024013834 A1 WO2024013834 A1 WO 2024013834A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
effect transistor
field effect
junction field
voltage
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.)
Ceased
Application number
PCT/JP2022/027333
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
陽介 渡邊
喬太 大塚
健二 廣瀬
玲仁 小林
佑介 山梶
諭 米田
憲彦 明石
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2022/027333 priority Critical patent/WO2024013834A1/ja
Priority to CN202280097846.4A priority patent/CN119487751A/zh
Priority to JP2024522173A priority patent/JP7504329B2/ja
Priority to DE112022007219.9T priority patent/DE112022007219B4/de
Publication of WO2024013834A1 publication Critical patent/WO2024013834A1/ja
Priority to US18/982,137 priority patent/US20250119119A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H2001/0021—Constructional details
    • H03H2001/005—Wound, ring or feed-through type inductor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H2001/0021—Constructional details
    • H03H2001/0057—Constructional details comprising magnetic material
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2210/00—Indexing scheme relating to details of tunable filters
    • H03H2210/02—Variable filter component
    • H03H2210/026—Inductor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2210/00—Indexing scheme relating to details of tunable filters
    • H03H2210/03—Type of tuning
    • H03H2210/033—Continuous

Definitions

  • the present disclosure relates to a filter circuit.
  • a filter circuit may be attached to the cable to suppress the propagation of electromagnetic noise.
  • a cylindrical ferrite core that can be attached to the cable afterward is often used. For example, by passing a cable through the hollow part of a cylindrical ferrite core, the magnetic field from the cable is strengthened, the self-inductance of the cable is increased, and the cable becomes high-impedance at high frequencies, thereby reducing electromagnetic noise to the cable. Interrupt transmission.
  • the additional effect of the ferrite core that is, the impedance characteristics of the ferrite core, is uniquely determined by physical constants such as the length of the ferrite core, the ratio of the inner diameter to the outer diameter of the cylinder, and the material properties of the ferrite. Methods for obtaining impedance characteristics are limited, and it has been difficult to adapt them to the many different types of cables.
  • Patent Document 1 discloses the configuration of a device that has a structure for defining impedance characteristics other than the physical constants of the ferrite core.
  • a separate winding is wound around a cylindrical part of the ferrite core so as to penetrate through the hollow part of the ferrite core attached to the cable that is the target of noise countermeasures.
  • It has a structure in which a resistor component is attached in series in the middle of the winding. Note that this resistance component may be formed of a variable resistor.
  • An object of the present disclosure is to provide a filter circuit that can simultaneously suppress propagation of electromagnetic noise in a cable and suppress deterioration of signal transmission quality.
  • a filter circuit includes a magnetic material core having a hollow hole through which a conductor wire can be inserted, a winding wire wound around the magnetic material core through the hollow hole of the magnetic material core, and a conductor wire connected to the winding wire. and a variable impedance section whose impedance is variable according to the current or voltage induced in the winding.
  • FIG. 1 is a diagram showing a configuration example of a filter circuit according to Embodiment 1.
  • FIG. 3 is a diagram illustrating a configuration example of a variable impedance section in Embodiment 1.
  • FIG. 3 is a diagram showing electrical connections of a filter circuit according to Embodiment 1.
  • FIG. 1 is a diagram showing electrical characteristics of a junction field effect transistor in Embodiment 1.
  • FIG. 1 is a diagram showing a configuration example of a filter circuit 1 according to the first embodiment.
  • the filter circuit 1 according to the first embodiment includes a magnetic core 10, a first winding 11, a second winding 12, and a variable impedance section 20. Ru.
  • the magnetic core 10 is formed into a cylindrical shape, as shown in FIG. Further, the magnetic core 10 is formed with a hollow hole through which the first winding 11, the second winding 12, and a cable (not shown) which is a conductor wire targeted for noise countermeasures can be inserted. .
  • the first winding 11 and the second winding 12 are wound around the magnetic core 10 through hollow holes formed in the magnetic core 10. Further, both ends of the first winding 11 (ends 11a and 11b) and both ends of the second winding 12 (ends 12a and 12b) are connected to the variable impedance section 20, respectively.
  • the variable impedance section 20 is connected to both ends of the first winding 11 (ends 11a and 11b) and to both ends of the second winding 12 (ends 12a and 12b).
  • the variable impedance section 20 controls current or voltage induced from the cable into the first winding 11 and the second winding 12 when a transmission signal such as a digital communication signal or a periodic square wave clock signal is transmitted through the cable.
  • the impedance is configured to be variable depending on the
  • FIG. 2 is a diagram showing a configuration example of the variable impedance section 20 in the first embodiment.
  • the variable impedance section 20 is configured to include an element 21, a peripheral circuit 22, a winding connection terminal 23, and a winding connection terminal 24, as shown in FIG.
  • the element 21 responds to the current or voltage induced from the cable into the first winding 11 and the second winding 12 when a transmission signal such as a digital communication signal or a periodic square wave clock signal is transmitted through the cable. It has a characteristic that the impedance is adaptively variable.
  • the element 21 is, for example, a junction field-effect transistor (JFET), which is one type of field-effect transistor.
  • the peripheral circuit 22 is a circuit for electrically connecting the element 21 to the winding connection terminals 23 and 24.
  • the peripheral circuit 22 includes, for example, a resistor 25 and a conductor wiring 26 (see FIG. 3).
  • the winding connection terminal 23 is a terminal to which the ends 11a and 11b of the first winding 11 are connected. As shown in FIG. 2, two winding connection terminals 23 are provided, for example, at the corners of the peripheral circuit 22.
  • the winding connection terminal 24 is a terminal to which the ends 12a and 12b of the second winding 12 are connected. As shown in FIG. 2, two winding connection terminals 24 are provided, for example, in corners of the peripheral circuit 22 at different locations from where the winding connection terminals 23 are provided.
  • peripheral circuit 22 only needs to be provided with a number of winding connection terminals corresponding to the number of windings. For example, in the first embodiment, since two windings are used, a total of four winding connection terminals are provided.
  • FIG. 3 is a diagram showing electrical connections of the filter circuit 1 according to the first embodiment.
  • first winding 11 and second winding 12 are used and an N-channel junction field effect transistor is used as the element 21 of the variable impedance section 20. explain.
  • the ends 11a and 11b of the first winding 11 are connected to the two winding connection terminals 23, respectively.
  • one of the two winding connection terminals 23 (for example, the one to which the end 11a of the first winding 11 is connected) is connected to the junction field effect transistor 21 through the conductor wiring 26 and the resistor 25. connected to the drain terminal of Further, the other of the two winding connection terminals 23 (for example, the one to which the end portion 11b of the first winding 11 is connected) is connected to the junction field effect transistor 21 through the conductor wiring 26 and the resistor 25. connected to the source terminal of the
  • the two winding connection terminals 23 that is, the drain terminal and source terminal of the junction field effect transistor 21 are also connected via the conductor wiring 26 and the resistor 25 .
  • the potential difference generated in the first winding 11 is applied as a voltage between the drain terminal and the source terminal of the junction field effect transistor 21.
  • this voltage will also be referred to as a "drain-source voltage.”
  • the ends 12a and 12b of the second winding 12 are connected to the two winding connection terminals 24, respectively.
  • One of the two winding connection terminals 24 (for example, the one to which the end 12a of the second winding 12 is connected) is connected to the gate of the junction field effect transistor 21 via the conductor wiring 26 and the resistor 25. Connected to the terminal. Further, the other of the two winding connection terminals 24 (for example, the one to which the end 12b of the second winding 12 is connected) is connected to the junction field effect transistor 21 via a conductor wiring 26 and a resistor 25. and the other of the two winding connection terminals 23. Thereby, the potential difference generated in the second winding 12 is applied as a voltage between the gate terminal and the source terminal of the junction field effect transistor 21. Hereinafter, this voltage will also be referred to as "gate-source voltage.”
  • the user attaches the filter circuit 1 to the cable that is the target of noise countermeasures. Specifically, the user inserts the cable into the hollow hole of the magnetic core 10 described above. Note that this cable is assigned in advance the role of transmitting a transmission signal such as a digital communication signal or a periodic square wave clock signal, and not only electromagnetic noise but also the transmission signal is transmitted through this cable.
  • a transmission signal such as a digital communication signal or a periodic square wave clock signal
  • the magnetic field generated from the cable is strengthened in the magnetic material core 10.
  • This not only generates a potential difference in the first winding 11 wound around the magnetic material core 10 according to the number of turns of the first winding 11, but also generates a potential difference in the second winding 12.
  • a potential difference is generated depending on the number of turns of the second winding 12. Therefore, a drain-source voltage and a gate-source voltage are applied to the junction field effect transistor 21.
  • FIG. 4 shows the electrical characteristics of a general N-channel junction field effect transistor.
  • the horizontal axis indicates the drain-source voltage applied to the junction field effect transistor 21, and the vertical axis indicates the current flowing between the drain terminal and source terminal of the junction field effect transistor 21 (hereinafter simply referred to as "drain”). (also called “current").
  • a drain current flows according to the applied drain-source voltage.
  • the drain current increases.
  • the drain current does not increase even if the drain-source voltage is increased when the applied drain-source voltage is on the right side of the region indicated by the dashed line shown in FIG.
  • the region to the left of this dashed line is called a resistance region, and the region to the right is called a saturation region.
  • the value of the drain current can be changed depending on the value of the applied drain-source voltage in the resistance region to the left of the dashed-dotted line. That is, in the junction field effect transistor 21, the ratio between the value of the applied drain-source voltage and the value of the drain current is the resistance between the drain terminal and the source terminal (hereinafter also referred to as "drain-source resistance"). ), it is possible to change the value of the drain-source resistance within the resistance region by changing the applied drain-source voltage.
  • the characteristic curve of the drain current can also be changed by changing the value of the gate-source voltage applied to the junction field effect transistor 21.
  • the gate-source voltage applied to the junction field effect transistor 21 is 0V
  • the characteristic curve of the drain current becomes a locus as shown by reference numeral 401, and this gate-source voltage becomes smaller from 0V.
  • the trajectories change to those shown at 402, 403, and 404. That is, in the first embodiment, by changing the value of the gate-source voltage applied to the junction field effect transistor 21, the value of the drain-source voltage and the value of the drain current can be changed within the resistance region. It becomes possible to change the ratio of the drain-to-source resistance, that is, the value of the drain-source resistance.
  • reference numeral 405 shown in FIG. 4 indicates the value of the drain-source resistance when the characteristic curve of the drain current takes the locus shown by reference numeral 404.
  • the electrical characteristics of the junction field effect transistor 21 shown in FIG. the types of the winding 11 and the second winding 12, the type of conductor wiring 26 included in the peripheral circuit 22, and the constant of the resistor 25 included in the peripheral circuit 22 can be adjusted by changing at least one of the following.
  • the width of change when changing the value of the drain-source resistance as described above can be designed as appropriate by making the above adjustment depending on the purpose of using the filter circuit 1, for example. .
  • the first winding can be adjusted at the timing when the voltage or current related to the transmission signal and electromagnetic noise flowing through the cable increases or decreases.
  • the value of the drain-source resistance of the junction field effect transistor 21 can be varied.
  • the variable impedance section 20 connects the two winding connection terminals 23. The resistance value of can be changed.
  • the user may The above-mentioned characteristic adjustment elements are adjusted in advance so that the source-to-source resistance is as small as possible.
  • the user may Adjust the above-mentioned characteristic adjustment elements in advance so that the source-to-source resistance is as large as possible.
  • the filter circuit 1 when the voltage or current related to the transmission signal flowing through the cable becomes large, or when the voltage or current related to electromagnetic noise flowing through the cable becomes small, Since the drain-source resistance of the junction field effect transistor 21 is reduced and the impedance of the cable electromagnetically coupled by the magnetic material core 10 is reduced, distortion of the waveform or ringing of the transmission signal can be suppressed.
  • the filter circuit 1 according to the first embodiment also has the advantage that when the voltage or current related to the transmission signal flowing through the cable becomes small, or when the voltage or current related to electromagnetic noise flowing through the cable becomes large.
  • the resistance between the drain and source of the junction field effect transistor 21 increases, and the impedance of the cable electromagnetically coupled by the magnetic material core 10 increases. Propagation of electromagnetic noise through the cable can be suppressed.
  • the filter circuit 1 configured as described above to a cable through which a transmission signal such as a digital communication signal or a clock signal flows, generation of waveform distortion or ringing of the transmission signal can be prevented.
  • a transmission signal such as a digital communication signal or a clock signal flows
  • propagation of electromagnetic noise it is also possible to suppress propagation of electromagnetic noise in the cable.
  • winding connection terminals 23 and 24 are provided at the corners of the peripheral circuit 22.
  • the locations where the winding connection terminals 23 and 24 are provided are not limited to the corners of the peripheral circuit 22.
  • it may be provided at any location in the peripheral circuit 22 depending on the manner in which the first winding 11 and the second winding 12 are wound around the magnetic material core 10.
  • the filter circuit 1 includes two windings (the first winding 11 and the second winding 12).
  • the filter circuit 1 is not limited to this, and may include three or more windings.
  • the peripheral circuit 22 may be configured to include a number of winding connection terminals corresponding to the number of windings.
  • the peripheral circuit 22 is configured to include a total of six winding connection terminals. Ru. Further, each of the six winding connection terminals is connected to one of the drain terminal, gate terminal, and source terminal of the junction field effect transistor 21 via the conductor wiring 26 and the resistor 25, as described above. .
  • the magnitude of the drain-source voltage and the gate-source voltage applied to the junction field effect transistor 21 can be adjusted, and as a result, the value of the drain-source resistance can be adjusted.
  • the element 21 of the variable impedance section 20 is composed of an N-channel junction field effect transistor.
  • the element 21 of the variable impedance section 20 is not limited to this, and may be composed of, for example, a P-channel junction field effect transistor.
  • the drain current in the electrical characteristics shown in FIG. 4 becomes smaller as the gate-source voltage applied to the element 21 is increased from 0V. That is, the drain current characteristic curve in the electrical characteristics shown in FIG. 4 changes to trajectories 402, 403, and 404 as the gate-source voltage applied to the element 21 increases from 0V.
  • the element 21 of the variable impedance section 20 is composed of a junction field effect transistor.
  • the element 21 of the variable impedance section 20 is not limited to this, and may be, for example, a bipolar transistor, a metal-oxide-semiconductor field-effect transistor (MOSFET), or an insulated gate transistor.
  • gate bipolar transistor: IGBT gate bipolar transistor
  • the element 21 of the variable impedance section 20 is composed of an N-channel junction field effect transistor, and the filter circuit 1 has two windings (the first winding 11 and the second winding 12). ) was explained. However, when the element 21 of the variable impedance section 20 is composed of an N-channel or P-channel junction field effect transistor, the filter circuit 1 omits the second winding 12 and uses only one winding (the first It may be configured to include a winding 11).
  • the user since no gate-source voltage is applied to the element 21 (junction field effect transistor), the user changes the value of the drain-source resistance according to the drain current characteristic curve shown at 401 in FIG. Just let it happen.
  • the user may In order to make the source-to-source resistance as small as possible, the above-mentioned characteristic adjustment elements except those related to the second winding 12 may be adjusted in advance.
  • the above-mentioned characteristic adjustment elements except those related to the second winding 12 may be adjusted in advance.
  • the filter circuit 1 is configured to include two windings (the first winding 11 and the second winding 12), and the element 21 is connected between the gate and the source. It is preferable to apply a voltage because the user can change the value of the drain-source resistance more flexibly.
  • the filter circuit 1 may be configured to include two windings (first winding 11 and second winding 12). In that case, the magnitude of the drain current flowing through the element 21 can be increased by controlling the magnitude of the current or voltage applied between the gate and source of the element 21 by the current or voltage induced in the second winding 12. All you have to do is control it.
  • the filter circuit 1 includes a magnetic material core 10 having a hollow hole through which a conductor wire can be inserted, and a conductor wire wound around the magnetic material core 10 through the hollow hole of the magnetic material core 10. windings 11 and 12, and a variable impedance section 20 that is connected to the windings 11 and 12 and whose impedance is variable according to the current or voltage induced in the windings from the conductor wire.
  • the filter circuit 1 according to the first embodiment can achieve both suppression of propagation of electromagnetic noise in the cable and suppression of deterioration of signal transmission quality.
  • variable impedance section 20 includes an element 21 having a characteristic that the impedance is adaptively variable according to the current or voltage induced in the windings 11 and 12 from the conductor wire, and the element 21 and the windings 11 and 12.
  • the impedance of the variable impedance section 20 is determined by the type of the element 21, the number of turns of the windings 11 and 12, the winding 11, and the resistor 25 connected to the conductor wiring 26. 12 types, the type of conductor wiring 26, and the constant of the resistor 25.
  • the filter circuit 1 according to the first embodiment can adjust the impedance of the cable as appropriate, and can easily achieve both suppression of electromagnetic noise propagation in the cable and suppression of signal transmission quality deterioration. Become.
  • the element 21 is a junction field effect transistor, and the winding includes a first winding 11, and one end 11a of the first winding 11 is connected to the drain terminal of the junction field effect transistor.
  • the other end 11b of the first winding 11 is connected to the source terminal of the junction field effect transistor, and the impedance of the variable impedance section 20 is such that current or voltage is induced from the conductor wire to the first winding 11. It corresponds to the ratio of the voltage generated between the drain and source of the junction field effect transistor and the current flowing between the drain and source of the junction field effect transistor when Thereby, the filter circuit 1 according to the first embodiment can achieve both suppression of propagation of electromagnetic noise in the cable and suppression of deterioration of signal transmission quality with a simple configuration.
  • the winding includes a second winding 12, one end 12a of the second winding 12 is connected to the gate terminal of the junction field effect transistor, and the other end of the second winding 12 is connected to the gate terminal of the junction field effect transistor.
  • the impedance portion 12b is connected to the source terminal of the junction field effect transistor, and the impedance of the variable impedance portion 20 is such that when a current or voltage is induced from the conductor wire to the second winding 12, – Varies depending on the voltage developed between the source.
  • the present disclosure can achieve both suppression of propagation of electromagnetic noise in a cable and suppression of deterioration of signal transmission quality, and is suitable for use in a filter circuit.
  • 1 filter circuit 10 magnetic material core, 11 first winding, 11a end, 11b end, 12 second winding, 12a end, 12b end, 20 variable impedance section, 21 element (junction type electric field effect transistor), 22 peripheral circuit, 23 winding connection terminal, 24 winding connection terminal, 25 resistance, 26 conductor wiring, 401 to 404 drain current characteristic curve, 405 value of drain-source resistance.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Networks Using Active Elements (AREA)
  • Filters And Equalizers (AREA)
PCT/JP2022/027333 2022-07-12 2022-07-12 フィルタ回路 Ceased WO2024013834A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/JP2022/027333 WO2024013834A1 (ja) 2022-07-12 2022-07-12 フィルタ回路
CN202280097846.4A CN119487751A (zh) 2022-07-12 2022-07-12 滤波器电路
JP2024522173A JP7504329B2 (ja) 2022-07-12 2022-07-12 フィルタ回路
DE112022007219.9T DE112022007219B4 (de) 2022-07-12 2022-07-12 Filterschaltung
US18/982,137 US20250119119A1 (en) 2022-07-12 2024-12-16 Filter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/027333 WO2024013834A1 (ja) 2022-07-12 2022-07-12 フィルタ回路

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/982,137 Continuation US20250119119A1 (en) 2022-07-12 2024-12-16 Filter circuit

Publications (1)

Publication Number Publication Date
WO2024013834A1 true WO2024013834A1 (ja) 2024-01-18

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ID=89536124

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/027333 Ceased WO2024013834A1 (ja) 2022-07-12 2022-07-12 フィルタ回路

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US (1) US20250119119A1 (https=)
JP (1) JP7504329B2 (https=)
CN (1) CN119487751A (https=)
DE (1) DE112022007219B4 (https=)
WO (1) WO2024013834A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07115339A (ja) * 1993-10-18 1995-05-02 Hanshin Densen Kk ラインフィルタおよびラインフィルタのインピーダンス変化方法
JP2007243725A (ja) * 2006-03-09 2007-09-20 Tdk Corp アクティブ型フィルタ
JP2018037942A (ja) * 2016-09-01 2018-03-08 日本電信電話株式会社 妨害波抑制フィルタ
JP2019149675A (ja) * 2018-02-27 2019-09-05 日本電信電話株式会社 アクティブノイズフィルタおよびアクティブノイズフィルタの特性制御方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011136232A1 (ja) 2010-04-26 2011-11-03 Terakawa Takashige ノイズ減衰器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07115339A (ja) * 1993-10-18 1995-05-02 Hanshin Densen Kk ラインフィルタおよびラインフィルタのインピーダンス変化方法
JP2007243725A (ja) * 2006-03-09 2007-09-20 Tdk Corp アクティブ型フィルタ
JP2018037942A (ja) * 2016-09-01 2018-03-08 日本電信電話株式会社 妨害波抑制フィルタ
JP2019149675A (ja) * 2018-02-27 2019-09-05 日本電信電話株式会社 アクティブノイズフィルタおよびアクティブノイズフィルタの特性制御方法

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Publication number Publication date
CN119487751A (zh) 2025-02-18
DE112022007219B4 (de) 2025-09-04
JPWO2024013834A1 (https=) 2024-01-18
JP7504329B2 (ja) 2024-06-21
DE112022007219T5 (de) 2025-03-13
US20250119119A1 (en) 2025-04-10

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