JPS572122A - Analog-to-digital converter - Google Patents

Analog-to-digital converter

Info

Publication number
JPS572122A
JPS572122A JP7432380A JP7432380A JPS572122A JP S572122 A JPS572122 A JP S572122A JP 7432380 A JP7432380 A JP 7432380A JP 7432380 A JP7432380 A JP 7432380A JP S572122 A JPS572122 A JP S572122A
Authority
JP
Japan
Prior art keywords
voltage
input
comparator
output
excessive
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
JP7432380A
Other languages
Japanese (ja)
Inventor
Shoichi Furutoku
Kanman Hamada
Takashi Sase
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7432380A priority Critical patent/JPS572122A/en
Publication of JPS572122A publication Critical patent/JPS572122A/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 realize measurement for an excessive analog input, by giving compression to an excessive analog input signal with a certain ratio and then amplifying the input signal within a range of the maximum allowable input of an operational amplifier. CONSTITUTION:The output EO of an operational amplifier 1 is connected to the input to be compared of a comparator 3 and then compared with the comparison voltage -EC that is set at the output level of the amplifier 1 equivalent to the maximum allowable input voltage of a converter. On the other hand, a currenter 5 works until the output of the comparator 3 inverts and in the period during which the integrating time TS of the input voltage Ei elapses. When the comparator 3 inverts at the time of TS', the counter 5 stops its counting action. Thus a control circuit 5 opens a switch SW1 and at the same time latches the counting value of the counter 5 to a register 7 to supply a signal indicating an overflow of the voltage Ei to the register 7. Thus an excessive input is detected during a period of integration of the voltage Ei, and the pulse number is counted in proportion to the voltage Ei to obtain a digital output.
JP7432380A 1980-06-04 1980-06-04 Analog-to-digital converter Pending JPS572122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7432380A JPS572122A (en) 1980-06-04 1980-06-04 Analog-to-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7432380A JPS572122A (en) 1980-06-04 1980-06-04 Analog-to-digital converter

Publications (1)

Publication Number Publication Date
JPS572122A true JPS572122A (en) 1982-01-07

Family

ID=13543783

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7432380A Pending JPS572122A (en) 1980-06-04 1980-06-04 Analog-to-digital converter

Country Status (1)

Country Link
JP (1) JPS572122A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60207225A (en) * 1984-03-30 1985-10-18 株式会社東芝 Method of producing contact material for vacuum bulb
JPH02117027A (en) * 1988-10-27 1990-05-01 Meidensha Corp Electrode material of vacuum interrupter and its manufacture
JPH02117028A (en) * 1988-10-27 1990-05-01 Meidensha Corp Electrode material of vacuum interrupter and its manufacture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60207225A (en) * 1984-03-30 1985-10-18 株式会社東芝 Method of producing contact material for vacuum bulb
JPH02117027A (en) * 1988-10-27 1990-05-01 Meidensha Corp Electrode material of vacuum interrupter and its manufacture
JPH02117028A (en) * 1988-10-27 1990-05-01 Meidensha Corp Electrode material of vacuum interrupter and its manufacture

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