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GB2509655B - A filter circuit - Google Patents

A filter circuit

Info

Publication number
GB2509655B
GB2509655B GB1407065.0A GB201407065A GB2509655B GB 2509655 B GB2509655 B GB 2509655B GB 201407065 A GB201407065 A GB 201407065A GB 2509655 B GB2509655 B GB 2509655B
Authority
GB
United Kingdom
Prior art keywords
filter circuit
filter
circuit
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.)
Active
Application number
GB1407065.0A
Other versions
GB2509655A (en
GB201407065D0 (en
Inventor
John Jones Peter
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.)
XTRA SENSE Ltd
Original Assignee
XTRA SENSE 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 XTRA SENSE Ltd filed Critical XTRA SENSE Ltd
Publication of GB201407065D0 publication Critical patent/GB201407065D0/en
Publication of GB2509655A publication Critical patent/GB2509655A/en
Application granted granted Critical
Publication of GB2509655B publication Critical patent/GB2509655B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
    • H03H9/21—Crystal tuning forks
    • H03H9/215—Crystal tuning forks consisting of quartz
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/58—Multiple crystal filters
    • 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
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1208—Frequency selective two-port networks using amplifiers with feedback comprising an electromechanical resonator

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
GB1407065.0A 2011-09-22 2012-09-24 A filter circuit Active GB2509655B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1116434.0A GB201116434D0 (en) 2011-09-22 2011-09-22 A filter circuit
PCT/GB2012/000735 WO2013041828A1 (en) 2011-09-22 2012-09-24 Filter circuit with neutralised stray capacitance of a piezo - crystal

Publications (3)

Publication Number Publication Date
GB201407065D0 GB201407065D0 (en) 2014-06-04
GB2509655A GB2509655A (en) 2014-07-09
GB2509655B true GB2509655B (en) 2018-04-25

Family

ID=44937725

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB1116434.0A Ceased GB201116434D0 (en) 2011-09-22 2011-09-22 A filter circuit
GB1407065.0A Active GB2509655B (en) 2011-09-22 2012-09-24 A filter circuit

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB1116434.0A Ceased GB201116434D0 (en) 2011-09-22 2011-09-22 A filter circuit

Country Status (2)

Country Link
GB (2) GB201116434D0 (en)
WO (1) WO2013041828A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114124028B (en) * 2021-11-24 2025-12-30 中国南方电网有限责任公司超高压输电公司贵阳局 Combining filter circuits and filter equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE280581C (en) * 1913-08-05 1914-11-24 Gustav Huguenin AIR CLEANER IN WHICH THE AIRFLOW IS DIVIDED INTO SEVERAL BRANCHES ON ZIGZAG-SHAPED PATHS ON DAMP WALLS
US3946328A (en) * 1975-01-27 1976-03-23 Northern Electric Company, Limited Functionally tunable active filter
GB2433367A (en) * 2005-12-03 2007-06-20 Peter John Jones Filter using tuning fork crystals

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51138363A (en) 1975-05-26 1976-11-29 Noto Denshi Kogyo Kk Band-pass filter using a piezoelectric tunig furk
CH617297A5 (en) 1977-09-30 1980-05-14 Straumann Inst Ag Electromechanical oscillator, particularly for a band-pass filter of a remote control device
DE2808581C2 (en) * 1978-02-28 1988-05-05 Siemens AG, 1000 Berlin und 8000 München Filter circuit with a bandpass transfer function of the fourth degree

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE280581C (en) * 1913-08-05 1914-11-24 Gustav Huguenin AIR CLEANER IN WHICH THE AIRFLOW IS DIVIDED INTO SEVERAL BRANCHES ON ZIGZAG-SHAPED PATHS ON DAMP WALLS
US3946328A (en) * 1975-01-27 1976-03-23 Northern Electric Company, Limited Functionally tunable active filter
GB2433367A (en) * 2005-12-03 2007-06-20 Peter John Jones Filter using tuning fork crystals

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JUNG, W. et al: ELECTRONICS WORLD, 101, No 1708, 1 March1995, pp 250-253. *
Sedra, A.S., et al, "Microelectronic Circuits", Oxford University Press, New York, 1998, pp 667-670. *

Also Published As

Publication number Publication date
WO2013041828A1 (en) 2013-03-28
GB2509655A (en) 2014-07-09
GB201116434D0 (en) 2011-11-02
GB201407065D0 (en) 2014-06-04
WO2013041828A4 (en) 2013-05-23

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