JPS57160218A - Analog-to-digital converting circuit - Google Patents

Analog-to-digital converting circuit

Info

Publication number
JPS57160218A
JPS57160218A JP4609281A JP4609281A JPS57160218A JP S57160218 A JPS57160218 A JP S57160218A JP 4609281 A JP4609281 A JP 4609281A JP 4609281 A JP4609281 A JP 4609281A JP S57160218 A JPS57160218 A JP S57160218A
Authority
JP
Japan
Prior art keywords
photoelectric
reference voltage
limit
analog
converting
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
JP4609281A
Other languages
Japanese (ja)
Other versions
JPH0145253B2 (en
Inventor
Masahiro Aoki
Kenichi Oikami
Asao Hayashi
Masatoshi Ida
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP4609281A priority Critical patent/JPS57160218A/en
Publication of JPS57160218A publication Critical patent/JPS57160218A/en
Publication of JPH0145253B2 publication Critical patent/JPH0145253B2/ja
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
    • H03M1/12—Analogue/digital converters
    • H03M1/50—Analogue/digital converters with intermediate conversion to time interval
    • H03M1/56—Input signal compared with linear ramp

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Automatic Focus Adjustment (AREA)
  • Analogue/Digital Conversion (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To perform high-precision A/D conversion by optionally setting the upper limit and lower limit of an analog reference voltage for converting photoelectric signals from photoelecdric converting circuits from analog to digital, and then correcting them according to the drift of the photoelectric converting circuits. CONSTITUTION:A photodetector 1 having many photoelectric converting circuits is controlled by a control circuit 2 and a photoelectric signal read out successively by a decoder 3 is inputted to the comparators CP5 of an A/D converting circuit 4. An oscillator 6 is controlled by the output of the CP5 and the count value of a counter 7 which counts a clock signal from the oscillator 6 is inputted to a D/A converting circuit 8, which applies the CP5 with an analog reference voltage which corresponds to the count value. The CP5 stops the oscillator 6 when a level relation between the photoelectric signal and analog reference voltage is inverted, and the count value of the counter 7 at that time is outputted as the A/D-converted signal of the photoelectric signal. In this case, the photodetector 1 generates and applies the lower-limit value and upper- limit value of the analog reference voltage through a lower-limit voltage setter 41 and an upper-limit voltage setter 42 to correct the reference voltage according to the drift of the photoelectric converting circuits.
JP4609281A 1981-03-28 1981-03-28 Analog-to-digital converting circuit Granted JPS57160218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4609281A JPS57160218A (en) 1981-03-28 1981-03-28 Analog-to-digital converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4609281A JPS57160218A (en) 1981-03-28 1981-03-28 Analog-to-digital converting circuit

Publications (2)

Publication Number Publication Date
JPS57160218A true JPS57160218A (en) 1982-10-02
JPH0145253B2 JPH0145253B2 (en) 1989-10-03

Family

ID=12737339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4609281A Granted JPS57160218A (en) 1981-03-28 1981-03-28 Analog-to-digital converting circuit

Country Status (1)

Country Link
JP (1) JPS57160218A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231456A (en) * 1983-06-15 1984-12-26 Nippon Telegr & Teleph Corp <Ntt> Level detecting apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51108561A (en) * 1975-03-19 1976-09-25 Nippon Electric Co Anarogu deijitaruhenkankairo
JPS51139760A (en) * 1975-05-28 1976-12-02 Minolta Camera Co Ltd A-d converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51108561A (en) * 1975-03-19 1976-09-25 Nippon Electric Co Anarogu deijitaruhenkankairo
JPS51139760A (en) * 1975-05-28 1976-12-02 Minolta Camera Co Ltd A-d converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231456A (en) * 1983-06-15 1984-12-26 Nippon Telegr & Teleph Corp <Ntt> Level detecting apparatus

Also Published As

Publication number Publication date
JPH0145253B2 (en) 1989-10-03

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