JPS5741032A - Analog-to-digital converter - Google Patents

Analog-to-digital converter

Info

Publication number
JPS5741032A
JPS5741032A JP55115835A JP11583580A JPS5741032A JP S5741032 A JPS5741032 A JP S5741032A JP 55115835 A JP55115835 A JP 55115835A JP 11583580 A JP11583580 A JP 11583580A JP S5741032 A JPS5741032 A JP S5741032A
Authority
JP
Japan
Prior art keywords
vref
switch
vin
reference voltage
voltage
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
JP55115835A
Other languages
Japanese (ja)
Inventor
Shosaku Tsukagoshi
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP55115835A priority Critical patent/JPS5741032A/en
Priority to US06/293,264 priority patent/US4517549A/en
Publication of JPS5741032A publication Critical patent/JPS5741032A/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
    • H03M1/34—Analogue value compared with reference values
    • H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
    • H03M1/42—Sequential comparisons in series-connected stages with no change in value of analogue signal

Landscapes

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

Abstract

PURPOSE:To decrease the total number of capacity arrays, and to reduce an area of a chip, by setting the reference voltage of a comparator to 1/2, in a successive comparison type D/A converter. CONSTITUTION:Sampling of an input signal is executed by changing over a switch 120 and a switch 101 to the side of an analog input terminal 121 and the side of 2, respectively, and subsequently, the switch 120 is changed over to the side of ground. Voltage Vx in this case becomes Vx=(VRef/2)-Vin. Subsequently, decision of MSB (uppermost bit) is executed by changing over a switch 118 to the side of a reference voltage terminal 122. Voltage Vx in this case becomes Vx=(VRef/2-Vin) +VRef/2. Accordingly, comparison reference voltage of a comparator 102 becomes VRef/2 by a resistance 131. After that, in the same way, the input signal Vin is converted to a digital value by controlling switches 117-112.
JP55115835A 1980-08-25 1980-08-25 Analog-to-digital converter Pending JPS5741032A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP55115835A JPS5741032A (en) 1980-08-25 1980-08-25 Analog-to-digital converter
US06/293,264 US4517549A (en) 1980-08-25 1981-08-17 Weighted capacitor analogue-digital converters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55115835A JPS5741032A (en) 1980-08-25 1980-08-25 Analog-to-digital converter

Publications (1)

Publication Number Publication Date
JPS5741032A true JPS5741032A (en) 1982-03-06

Family

ID=14672291

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55115835A Pending JPS5741032A (en) 1980-08-25 1980-08-25 Analog-to-digital converter

Country Status (1)

Country Link
JP (1) JPS5741032A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592449A (en) * 1982-06-28 1984-01-09 Fujitsu Ltd Equalization processing system
JPS60120622A (en) * 1983-11-18 1985-06-28 ブルツクトリー　コーポレーシヨン Integrated circuit chip for converting between digital valueand analog value
JPS6130815A (en) * 1984-07-23 1986-02-13 Oki Electric Ind Co Ltd Analog/digital converter
JPH0348528A (en) * 1989-07-17 1991-03-01 Sanyo Electric Co Ltd A/d converter
JP2017135616A (en) * 2016-01-28 2017-08-03 日本放送協会 Analog/digital conversion circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200863A (en) * 1977-10-03 1980-04-29 The Regents Of The University Of California Weighted capacitor analog/digital converting apparatus and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200863A (en) * 1977-10-03 1980-04-29 The Regents Of The University Of California Weighted capacitor analog/digital converting apparatus and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592449A (en) * 1982-06-28 1984-01-09 Fujitsu Ltd Equalization processing system
JPH0223057B2 (en) * 1982-06-28 1990-05-22 Fujitsu Ltd
JPS60120622A (en) * 1983-11-18 1985-06-28 ブルツクトリー　コーポレーシヨン Integrated circuit chip for converting between digital valueand analog value
JPS6366084B2 (en) * 1983-11-18 1988-12-19 Brooktree Corp
JPS6130815A (en) * 1984-07-23 1986-02-13 Oki Electric Ind Co Ltd Analog/digital converter
JPH0348528A (en) * 1989-07-17 1991-03-01 Sanyo Electric Co Ltd A/d converter
JP2017135616A (en) * 2016-01-28 2017-08-03 日本放送協会 Analog/digital conversion circuit

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