JPS57111122A - Analog-to-digital converter - Google Patents

Analog-to-digital converter

Info

Publication number
JPS57111122A
JPS57111122A JP18690080A JP18690080A JPS57111122A JP S57111122 A JPS57111122 A JP S57111122A JP 18690080 A JP18690080 A JP 18690080A JP 18690080 A JP18690080 A JP 18690080A JP S57111122 A JPS57111122 A JP S57111122A
Authority
JP
Japan
Prior art keywords
signal
negative
positive
inputted
inverted
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
JP18690080A
Other languages
Japanese (ja)
Inventor
Yukio Saito
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP18690080A priority Critical patent/JPS57111122A/en
Publication of JPS57111122A publication Critical patent/JPS57111122A/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
    • H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging

Landscapes

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

Abstract

PURPOSE:To constitute an A/D converter so that its accuracy is not varied irrespective of whether voltage is bipolar or unipolar, by providing a zero detecting circuit on said device so that an operation amplifying circuit is inverted or is not inverted by an output of this zero detecting circuit. CONSTITUTION:An input of bipolar voltage is detected by a zero detecting circuit 3 whether the polarity of its signal is positive or negative, is inputted to its output side and also is inputted to a controlling circuit 4. In case of a positive signal, the circuit 4 sets a switch 25 to the positive side of an input of an amplifier 27, outputs a control signal so that a switch 26 is opened, and in case of a negative signal, sets the switch 25 to the negative side of the input of the amplifier 27, and outputs a control signal so that the switch 26 is closed. Accordingly, as for the bipolar voltage which has been inputted, the positive signal is not inverted, and the negative signal is inverted by the amplifier 27. Inspective of whether the signal is positive or negative, the output of the amplifier 27 is outputted as unipolar voltage, and also since the degree of amplification is ''1'', the input signal is inputted to an A/D converter 1 as unipolar voltage.
JP18690080A 1980-12-26 1980-12-26 Analog-to-digital converter Pending JPS57111122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18690080A JPS57111122A (en) 1980-12-26 1980-12-26 Analog-to-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18690080A JPS57111122A (en) 1980-12-26 1980-12-26 Analog-to-digital converter

Publications (1)

Publication Number Publication Date
JPS57111122A true JPS57111122A (en) 1982-07-10

Family

ID=16196641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18690080A Pending JPS57111122A (en) 1980-12-26 1980-12-26 Analog-to-digital converter

Country Status (1)

Country Link
JP (1) JPS57111122A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0630112U (en) * 1992-09-11 1994-04-19 和光電機株式会社 Shoulder pad

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0630112U (en) * 1992-09-11 1994-04-19 和光電機株式会社 Shoulder pad

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