JPS5694835A - A/d converter - Google Patents

A/d converter

Info

Publication number
JPS5694835A
JPS5694835A JP17196379A JP17196379A JPS5694835A JP S5694835 A JPS5694835 A JP S5694835A JP 17196379 A JP17196379 A JP 17196379A JP 17196379 A JP17196379 A JP 17196379A JP S5694835 A JPS5694835 A JP S5694835A
Authority
JP
Japan
Prior art keywords
output
voltage
input
counter
comparator
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.)
Pending
Application number
JP17196379A
Other languages
Japanese (ja)
Inventor
Satoshi Yamane
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP17196379A priority Critical patent/JPS5694835A/en
Publication of JPS5694835A publication Critical patent/JPS5694835A/en
Pending 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
    • H03M1/12—Analogue/digital converters
    • H03M1/48—Servo-type converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To simplify the constitution of an A/D converter, by using the voltage of the charge storage element which is charged and discharged by the up-pulse and the down-pulse of an up-down counter respectively for the comparison voltage. CONSTITUTION:When the charging voltage B of the charge storage element 7 is lower than the voltage level of the analog input A at the time point t1, the output C of the comparator becomes a high level with the gate 8 turned on. Then the output of the pulse generator 10 is applied to the up-terminal of the up-down counter 13 as well as sent to the charging circuit 11 to charge the element 7. When the voltage B becomes equal to the input voltage at the time point t2, the output of the comparator 5 turns to a low level to discontinue the charging. With reduction of the input A, the output of the comparator 6 becomes a high level. Thus the output of the generator 10 is applied to the down-terminal of the counter 13 as well as to the discharging circuit 12. Thus the element 7 is discharged. The digital value corresponding to the input A is obtained from the output of the counter 13.
JP17196379A 1979-12-28 1979-12-28 A/d converter Pending JPS5694835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17196379A JPS5694835A (en) 1979-12-28 1979-12-28 A/d converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17196379A JPS5694835A (en) 1979-12-28 1979-12-28 A/d converter

Publications (1)

Publication Number Publication Date
JPS5694835A true JPS5694835A (en) 1981-07-31

Family

ID=15933002

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17196379A Pending JPS5694835A (en) 1979-12-28 1979-12-28 A/d converter

Country Status (1)

Country Link
JP (1) JPS5694835A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235064A (en) * 1984-05-08 1985-11-21 Matsushita Electric Ind Co Ltd Apparatus for detecting number of rotations
EP1528678A2 (en) * 2003-10-30 2005-05-04 Infineon Technologies AG Comparator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235064A (en) * 1984-05-08 1985-11-21 Matsushita Electric Ind Co Ltd Apparatus for detecting number of rotations
EP1528678A2 (en) * 2003-10-30 2005-05-04 Infineon Technologies AG Comparator
EP1528678A3 (en) * 2003-10-30 2007-01-03 Infineon Technologies AG Comparator

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