CA2658709C - Linear capacitance measurement and touchless switch - Google Patents

Linear capacitance measurement and touchless switch Download PDF

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Publication number
CA2658709C
CA2658709C CA2658709A CA2658709A CA2658709C CA 2658709 C CA2658709 C CA 2658709C CA 2658709 A CA2658709 A CA 2658709A CA 2658709 A CA2658709 A CA 2658709A CA 2658709 C CA2658709 C CA 2658709C
Authority
CA
Canada
Prior art keywords
capacitance
output
electrode
operational amplifier
sensor electrode
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 - Fee Related
Application number
CA2658709A
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English (en)
French (fr)
Other versions
CA2658709A1 (en
Inventor
Ying Lau Lee
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2658709A1 publication Critical patent/CA2658709A1/en
Application granted granted Critical
Publication of CA2658709C publication Critical patent/CA2658709C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • 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
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45138—Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45548—Indexing scheme relating to differential amplifiers the IC comprising one or more capacitors as shunts to earth or as short circuit between inputs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45594—Indexing scheme relating to differential amplifiers the IC comprising one or more resistors, which are not biasing resistor

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Amplifiers (AREA)
CA2658709A 2004-08-16 2005-08-16 Linear capacitance measurement and touchless switch Expired - Fee Related CA2658709C (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
US60161004P 2004-08-16 2004-08-16
US60/601,610 2004-08-16
US61969704P 2004-10-19 2004-10-19
US60/619,697 2004-10-19
US66237805P 2005-03-17 2005-03-17
US60/662,378 2005-03-17
US69048605P 2005-06-15 2005-06-15
US60/690,486 2005-06-15
CA2575648A CA2575648C (en) 2004-08-16 2005-08-16 Linear capacitance measurement and touchless switch

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA2575648A Division CA2575648C (en) 2004-08-16 2005-08-16 Linear capacitance measurement and touchless switch

Publications (2)

Publication Number Publication Date
CA2658709A1 CA2658709A1 (en) 2006-02-23
CA2658709C true CA2658709C (en) 2013-06-25

Family

ID=35907231

Family Applications (2)

Application Number Title Priority Date Filing Date
CA2658709A Expired - Fee Related CA2658709C (en) 2004-08-16 2005-08-16 Linear capacitance measurement and touchless switch
CA2575648A Expired - Fee Related CA2575648C (en) 2004-08-16 2005-08-16 Linear capacitance measurement and touchless switch

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA2575648A Expired - Fee Related CA2575648C (en) 2004-08-16 2005-08-16 Linear capacitance measurement and touchless switch

Country Status (6)

Country Link
US (1) US7323886B2 (enExample)
JP (1) JP4850835B2 (enExample)
CA (2) CA2658709C (enExample)
DE (1) DE112005001697T5 (enExample)
GB (2) GB2431246B (enExample)
WO (1) WO2006017988A1 (enExample)

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RU2472106C2 (ru) * 2008-12-23 2013-01-10 Закрытое акционерное общество "Нанотехнология-МДТ" Емкостной датчик для измерения линейных перемещений
JP5655223B2 (ja) 2009-01-30 2015-01-21 株式会社フジクラ 乗員姿勢検知装置
ES2655729T3 (es) * 2010-02-10 2018-02-21 Microchip Technology Germany Gmbh Sistema y procedimiento de generación de una señal correlacionada con una operación de entrada manual
JP5502597B2 (ja) * 2010-05-24 2014-05-28 ルネサスエレクトロニクス株式会社 インピーダンス検出回路およびインピーダンス検出方法
JP5712558B2 (ja) * 2010-10-27 2015-05-07 セイコーエプソン株式会社 信号レベル変換回路、物理量検出装置及び電子機器
CN102006048B (zh) * 2010-12-24 2013-03-27 江苏惠通集团有限责任公司 按键侦测板
TW201232375A (en) * 2011-01-31 2012-08-01 xiang-yu Li Measuring device for micro impedance variation
TWI490456B (zh) 2011-04-29 2015-07-01 Elan Microelectronics Corp Differential Capacitance Sensing Circuit and Method
CN102364879A (zh) * 2011-06-23 2012-02-29 苏州瀚瑞微电子有限公司 电容式触摸按键的电路结构
JP2015194813A (ja) * 2014-03-31 2015-11-05 Smk株式会社 静電容量式タッチパネル
US9304643B2 (en) 2014-06-24 2016-04-05 Synaptics Incorporated Classifying input objects interacting with a capacitive button
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Also Published As

Publication number Publication date
CA2658709A1 (en) 2006-02-23
JP2008510396A (ja) 2008-04-03
DE112005001697T5 (de) 2008-07-24
CA2575648A1 (en) 2006-02-23
JP4850835B2 (ja) 2012-01-11
GB0701267D0 (en) 2007-02-28
GB0817444D0 (en) 2008-10-29
HK1102314A1 (zh) 2007-11-16
GB2431246A (en) 2007-04-18
GB2451765A8 (en) 2009-02-11
GB2451765B (en) 2009-05-06
GB2451765A (en) 2009-02-11
US20060033508A1 (en) 2006-02-16
US7323886B2 (en) 2008-01-29
CA2575648C (en) 2010-09-28
GB2431246B (en) 2009-01-14
WO2006017988A1 (en) 2006-02-23
GB2451765B8 (en) 2009-05-06

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Effective date: 20150817