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SE8405983D0 - Analog / Digital Converters - Google Patents

Analog / Digital Converters

Info

Publication number
SE8405983D0
SE8405983D0 SE8405983A SE8405983A SE8405983D0 SE 8405983 D0 SE8405983 D0 SE 8405983D0 SE 8405983 A SE8405983 A SE 8405983A SE 8405983 A SE8405983 A SE 8405983A SE 8405983 D0 SE8405983 D0 SE 8405983D0
Authority
SE
Sweden
Prior art keywords
digital
converter
signal
variable
analog
Prior art date
Application number
SE8405983A
Other languages
Swedish (sv)
Other versions
SE8405983L (en
Inventor
F M Jobbagy
Original Assignee
Dresser Ind
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 Dresser Ind filed Critical Dresser Ind
Publication of SE8405983D0 publication Critical patent/SE8405983D0/en
Publication of SE8405983L publication Critical patent/SE8405983L/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/10—Calibration or testing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/50—Analogue/digital converters with intermediate conversion to time interval
    • H03M1/52—Input signal integrated with linear return to datum

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Radiation Pyrometers (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

An analog signal VA representing the measured output of a condition responsive transducer is supplied to a dual slope integrating analog-to- digital converter 12 also receiving a regulated constant reference signal VA from which a signal Vmax is derived. Using an integrator 18 in a non- inverting mode, the A/D converter in sequence first integrates (Vmax-VA) for a fixed time period Tr and then integrates the sum of the first integrated signal and the reference signal VA for a variable time period TX down to VR as detected by a comparator 20. During integration, digital counts VD proportional to the variable integration period are accumulated and emitted for operating a digital device such as a digital display. Digital linearization of the converter output can optionally be provided by use of a programmed micro-computer reading a programmable-read-only- memory (PROM) to run a variable frequency clock. The clock is regulated to effect a first phase converter time corresponding with an even multiple of the power line frequency. <IMAGE>
SE8405983A 1978-09-05 1984-11-27 Analog / Digital Converters SE8405983L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US93931578A 1978-09-05 1978-09-05

Publications (2)

Publication Number Publication Date
SE8405983D0 true SE8405983D0 (en) 1984-11-27
SE8405983L SE8405983L (en) 1984-11-27

Family

ID=25472940

Family Applications (2)

Application Number Title Priority Date Filing Date
SE7907192A SE437591B (en) 1978-09-05 1979-08-29 ADC
SE8405983A SE8405983L (en) 1978-09-05 1984-11-27 Analog / Digital Converters

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SE7907192A SE437591B (en) 1978-09-05 1979-08-29 ADC

Country Status (10)

Country Link
JP (1) JPS5537100A (en)
BE (1) BE878605A (en)
CA (1) CA1146276A (en)
CH (1) CH633397A5 (en)
DE (1) DE2935831A1 (en)
FR (1) FR2435861B1 (en)
GB (2) GB2030392B (en)
IN (1) IN152608B (en)
NL (1) NL7905747A (en)
SE (2) SE437591B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595906A (en) * 1982-08-12 1986-06-17 Intersil, Inc. Scaled analog to digital coverter
DE3906754A1 (en) * 1989-03-03 1990-09-13 Messerschmitt Boelkow Blohm INTEGRATION ARRANGEMENT

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061939A (en) * 1959-02-26 1962-11-06 Toyozawa Yoji Precise measuring method for an inner diameter of a cylinder
US3316546A (en) * 1963-10-15 1967-04-25 Westinghouse Electric Corp Analog to digital converter system
US3458803A (en) * 1966-03-21 1969-07-29 David E Maguire Apparatus and method for directly measuring capacitance and dissipation factor of capacitors
GB1211755A (en) * 1967-03-20 1970-11-11 Westinghouse Electric Corp Analog-to-digital conversion system
US3566397A (en) * 1969-01-15 1971-02-23 Ibm Dual slope analog to digital converter
FR2041678A5 (en) * 1969-05-28 1971-01-29 Schlumberger Cie N
GB1390063A (en) * 1971-03-03 1975-04-09 Zschimmer G Method and apparatus for measuring a voltage with the aid of an analogue-digital converter
US3742233A (en) * 1971-08-20 1973-06-26 Dresser Ind Motion displacement transducer
US3747089A (en) * 1971-11-09 1973-07-17 K Sharples Analog to digital converter
JPS4939547A (en) * 1972-08-22 1974-04-13
US3939459A (en) * 1974-01-09 1976-02-17 Leeds & Northrup Company Digital signal linearizer
US3967270A (en) * 1974-07-08 1976-06-29 Essex International, Inc. Analog-to-digital converter
JPS5138546A (en) * 1974-09-28 1976-03-31 Takeda Maiyaa Kk KURIIRUSUTANDO
JPS52444A (en) * 1975-06-23 1977-01-05 Advantest Corp Analog-digital converter
JPS524765A (en) * 1975-06-30 1977-01-14 Hewlett Packard Yokogawa Dual slope analoggtoodigital converter
JPS52131447A (en) * 1976-04-28 1977-11-04 Toshiba Corp Bipolar a/d converter
US4109147A (en) * 1976-05-10 1978-08-22 Dresser Industries, Inc. Optical position sensor
JPS5245250A (en) * 1976-10-07 1977-04-09 Yokogawa Hokushin Electric Corp Analog to digital convertor
DE2747338A1 (en) * 1977-10-21 1979-04-26 Hartmann & Braun Ag Two-ramp A=D converter - has shift register and logic circuits to control slope

Also Published As

Publication number Publication date
JPS5537100A (en) 1980-03-14
NL7905747A (en) 1980-03-07
GB2103442A (en) 1983-02-16
GB2030392B (en) 1983-03-30
GB2030392A (en) 1980-04-02
DE2935831A1 (en) 1980-03-13
DE2935831C2 (en) 1991-11-14
IN152608B (en) 1984-02-18
BE878605A (en) 1979-12-31
FR2435861B1 (en) 1986-05-09
FR2435861A1 (en) 1980-04-04
SE7907192L (en) 1980-03-06
CA1146276A (en) 1983-05-10
SE8405983L (en) 1984-11-27
GB2103442B (en) 1983-08-03
SE437591B (en) 1985-03-04
CH633397A5 (en) 1982-11-30

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Legal Events

Date Code Title Description
NAV Patent application has lapsed

Ref document number: 8405983-1

Effective date: 19871229