GB1372832A - Logarithmic circuit - Google Patents

Logarithmic circuit

Info

Publication number
GB1372832A
GB1372832A GB159173A GB159173A GB1372832A GB 1372832 A GB1372832 A GB 1372832A GB 159173 A GB159173 A GB 159173A GB 159173 A GB159173 A GB 159173A GB 1372832 A GB1372832 A GB 1372832A
Authority
GB
United Kingdom
Prior art keywords
amplifier
signals
output
bias
gain
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
Application number
GB159173A
Other languages
English (en)
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.)
Photo Electronics Corp
Original Assignee
Photo Electronics 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 Photo Electronics Corp filed Critical Photo Electronics Corp
Publication of GB1372832A publication Critical patent/GB1372832A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J1/18—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors using comparison with a reference electric value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G01J3/524—Calibration of colorimeters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/24—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating logarithmic or exponential functions, e.g. hyperbolic functions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Software Systems (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Amplifiers (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
GB159173A 1972-01-14 1973-01-11 Logarithmic circuit Expired GB1372832A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21777572A 1972-01-14 1972-01-14

Publications (1)

Publication Number Publication Date
GB1372832A true GB1372832A (en) 1974-11-06

Family

ID=22812459

Family Applications (1)

Application Number Title Priority Date Filing Date
GB159173A Expired GB1372832A (en) 1972-01-14 1973-01-11 Logarithmic circuit

Country Status (5)

Country Link
US (1) US3724954A (US06653308-20031125-C00199.png)
JP (1) JPS5538708B2 (US06653308-20031125-C00199.png)
CA (1) CA1012248A (US06653308-20031125-C00199.png)
DE (1) DE2301656C2 (US06653308-20031125-C00199.png)
GB (1) GB1372832A (US06653308-20031125-C00199.png)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH566543A5 (US06653308-20031125-C00199.png) * 1972-04-28 1975-09-15 Micromedic Systems Inc
US3876878A (en) * 1972-05-22 1975-04-08 Said Frank By Said Miles And A Control system for color pattern generator
US3828226A (en) * 1972-12-20 1974-08-06 Carlson Co Chesley F Exposure override control
JPS5059034A (US06653308-20031125-C00199.png) * 1973-09-24 1975-05-22
US3909609A (en) * 1973-10-29 1975-09-30 Xerox Corp Light source measuring apparatus
US3984185A (en) * 1974-08-19 1976-10-05 Durst Ag Fabrik Fototechnischer Apparate Bozen Process and apparatus for filter value and exposure time determination in photographic color printing and enlarging
US4075559A (en) * 1975-07-24 1978-02-21 Westinghouse Electric Corporation Technique for extending the range of a signal measuring circuit
US4236079A (en) * 1977-12-02 1980-11-25 General Electric Company Tomographic scanning apparatus
US4309604A (en) * 1978-07-24 1982-01-05 Sharp Kabushiki Kaisha Apparatus for sensing the wavelength and intensity of light
US4231654A (en) * 1979-04-27 1980-11-04 Michael E. Gorski Controller for photographic enlarger or the like
JPS58223040A (ja) * 1982-06-22 1983-12-24 Nippon Koden Corp 呼吸気ガス濃度測定装置
US4628277A (en) * 1985-05-01 1986-12-09 General Electric Company Femtoammeter
US4792829A (en) * 1986-04-03 1988-12-20 Firmani Alexander D Light-exposure control unit
US7498779B2 (en) * 2005-01-28 2009-03-03 Broadcom Corporation Voltage supply interface with improved current sensitivity and reduced series resistance
US9503133B2 (en) 2012-12-03 2016-11-22 Dockon Ag Low noise detection system using log detector amplifier
CN105359408B (zh) * 2013-03-15 2018-10-02 多康公司 具有通用解调能力的对数放大器
US9236892B2 (en) 2013-03-15 2016-01-12 Dockon Ag Combination of steering antennas, CPL antenna(s), and one or more receive logarithmic detector amplifiers for SISO and MIMO applications
US9048943B2 (en) 2013-03-15 2015-06-02 Dockon Ag Low-power, noise insensitive communication channel using logarithmic detector amplifier (LDA) demodulator
US9684807B2 (en) 2013-03-15 2017-06-20 Dockon Ag Frequency selective logarithmic amplifier with intrinsic frequency demodulation capability
US11082014B2 (en) 2013-09-12 2021-08-03 Dockon Ag Advanced amplifier system for ultra-wide band RF communication
TWI568173B (zh) 2013-09-12 2017-01-21 多康股份有限公司 作為無頻率轉換之高敏感選擇接收器之對數檢測放大系統
US11183974B2 (en) 2013-09-12 2021-11-23 Dockon Ag Logarithmic detector amplifier system in open-loop configuration for use as high sensitivity selective receiver without frequency conversion

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237028A (en) * 1963-02-21 1966-02-22 James F Gibbons Logarithmic transfer circuit
US3448289A (en) * 1966-05-20 1969-06-03 Us Navy Logarthmic amplifier
US3528749A (en) * 1966-12-09 1970-09-15 Itek Corp Apparatus for measuring optical density
GB1214172A (en) * 1968-07-22 1970-12-02 Crosfield Electronics Ltd Improvements relating to image reproducing apparatus
GB1297364A (US06653308-20031125-C00199.png) * 1969-04-16 1972-11-22
US3653759A (en) * 1970-12-08 1972-04-04 Eastman Kodak Co Automatic control of color correction of photographic printers

Also Published As

Publication number Publication date
JPS5538708B2 (US06653308-20031125-C00199.png) 1980-10-06
DE2301656A1 (de) 1973-07-19
DE2301656C2 (de) 1983-05-26
US3724954A (en) 1973-04-03
JPS48104447A (US06653308-20031125-C00199.png) 1973-12-27
CA1012248A (en) 1977-06-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee