FR2454229A1 - Logarithmic A=D converter - has true logarithmic characteristic and employs two standard generators - Google Patents

Logarithmic A=D converter - has true logarithmic characteristic and employs two standard generators

Info

Publication number
FR2454229A1
FR2454229A1 FR7909175A FR7909175A FR2454229A1 FR 2454229 A1 FR2454229 A1 FR 2454229A1 FR 7909175 A FR7909175 A FR 7909175A FR 7909175 A FR7909175 A FR 7909175A FR 2454229 A1 FR2454229 A1 FR 2454229A1
Authority
FR
France
Prior art keywords
logarithmic
conversion
true
algebraic
converter
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.)
Granted
Application number
FR7909175A
Other languages
French (fr)
Other versions
FR2454229B1 (en
Inventor
Guy Paul Pierre Georges Cadet
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.)
Centre National dEtudes Spatiales CNES
Original Assignee
Centre National dEtudes Spatiales CNES
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 Centre National dEtudes Spatiales CNES filed Critical Centre National dEtudes Spatiales CNES
Priority to FR7909175A priority Critical patent/FR2454229A1/en
Publication of FR2454229A1 publication Critical patent/FR2454229A1/en
Application granted granted Critical
Publication of FR2454229B1 publication Critical patent/FR2454229B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • 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
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit

Abstract

The logarithmic analogue to digital converter has a true logarithmic characteristic and provides high speed conversion, which is based on the generation of two groups of preset reference voltage levels and a pair of comparators providing a set of low weighting signal outputs excited by (n-1) lines representing the binary value for conversion. The reference levels are of a form defined by algebraic and trigonometric equations involving the conversion voltage standard, the logarithmic base and whole numbers varying between 1 and (n-1) and 1 and (r-1) respectively. The comparator outputs are other algebraic and trigonometric functions based on the above factors and factors e and m where e and m are the whole and fractional parts respectively of the logarithm to base k representing the input voltage Vi.
FR7909175A 1979-04-11 1979-04-11 Logarithmic A=D converter - has true logarithmic characteristic and employs two standard generators Granted FR2454229A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7909175A FR2454229A1 (en) 1979-04-11 1979-04-11 Logarithmic A=D converter - has true logarithmic characteristic and employs two standard generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7909175A FR2454229A1 (en) 1979-04-11 1979-04-11 Logarithmic A=D converter - has true logarithmic characteristic and employs two standard generators

Publications (2)

Publication Number Publication Date
FR2454229A1 true FR2454229A1 (en) 1980-11-07
FR2454229B1 FR2454229B1 (en) 1982-11-19

Family

ID=9224218

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7909175A Granted FR2454229A1 (en) 1979-04-11 1979-04-11 Logarithmic A=D converter - has true logarithmic characteristic and employs two standard generators

Country Status (1)

Country Link
FR (1) FR2454229A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070175A2 (en) * 1981-07-10 1983-01-19 Sony Corporation Analog-to-digital converters
EP0070734A2 (en) * 1981-07-21 1983-01-26 Sony Corporation Analog-to-digital converters
EP0654908A1 (en) * 1993-11-22 1995-05-24 Eastman Kodak Company Piecewise-linear gamma corrected analog to digital conversion system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2199233A1 (en) * 1972-09-14 1974-04-05 Cit Alcatel
FR2199628A1 (en) * 1972-09-15 1974-04-12 Cit Alcatel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2199233A1 (en) * 1972-09-14 1974-04-05 Cit Alcatel
FR2199628A1 (en) * 1972-09-15 1974-04-12 Cit Alcatel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EXBK/74 *
EXBK/75 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070175A2 (en) * 1981-07-10 1983-01-19 Sony Corporation Analog-to-digital converters
EP0070175A3 (en) * 1981-07-10 1984-08-29 Sony Corporation Analog-to-digital converters
EP0070734A2 (en) * 1981-07-21 1983-01-26 Sony Corporation Analog-to-digital converters
EP0070734A3 (en) * 1981-07-21 1984-08-29 Sony Corporation Analog-to-digital converters
EP0654908A1 (en) * 1993-11-22 1995-05-24 Eastman Kodak Company Piecewise-linear gamma corrected analog to digital conversion system

Also Published As

Publication number Publication date
FR2454229B1 (en) 1982-11-19

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