JPS57202125A - Variable reference voltage generating circuit - Google Patents

Variable reference voltage generating circuit

Info

Publication number
JPS57202125A
JPS57202125A JP8677181A JP8677181A JPS57202125A JP S57202125 A JPS57202125 A JP S57202125A JP 8677181 A JP8677181 A JP 8677181A JP 8677181 A JP8677181 A JP 8677181A JP S57202125 A JPS57202125 A JP S57202125A
Authority
JP
Japan
Prior art keywords
voltage
reference voltage
circuit
geometric
output
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
JP8677181A
Other languages
Japanese (ja)
Inventor
Yukimasa Kusazaki
Shinichiro Hattori
Hironobu Aoki
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 JP8677181A priority Critical patent/JPS57202125A/en
Publication of JPS57202125A publication Critical patent/JPS57202125A/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
    • H03M1/66—Digital/analogue converters
    • H03M1/68—Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H03M1/74—Simultaneous conversion
    • H03M1/76—Simultaneous conversion using switching tree
    • H03M1/765—Simultaneous conversion using switching tree using a single level of switches which are controlled by unary decoded digital signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H03M1/74—Simultaneous conversion
    • H03M1/80—Simultaneous conversion using weighted impedances
    • H03M1/808—Simultaneous conversion using weighted impedances using resistors

Landscapes

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

Abstract

PURPOSE:To generate a reference voltage over a wide range with high resolution, by providing a geometric dividing circuit after a circuit generating an output voltage of geometric series of 2<1/n> relating to an input voltage. CONSTITUTION:One of a specific resistors 2<1/n>R, 2<2/n>R-2<(n-1)/n>R, R inserted in a feedback path of an operational amplifier 21 is selected by closing one of switches 23S1-23Sn with a signal from a control line B. That is, a 2<1/n> geometric ratio voltage is produced at an output of a circuit 2 relating to a voltage Vref of a reference voltage source 10. An output voltage V1 of the circuit 2 is divided into a (1/n) geometric ratio voltage with a voltage dividing resistor 11. One of the divided voltages is selected by closing one of switches 12S1-12Sm with a control signal from a control line A. A reference voltage V2 is obtained from an output terminal 4.
JP8677181A 1981-06-08 1981-06-08 Variable reference voltage generating circuit Pending JPS57202125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8677181A JPS57202125A (en) 1981-06-08 1981-06-08 Variable reference voltage generating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8677181A JPS57202125A (en) 1981-06-08 1981-06-08 Variable reference voltage generating circuit

Publications (1)

Publication Number Publication Date
JPS57202125A true JPS57202125A (en) 1982-12-10

Family

ID=13896005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8677181A Pending JPS57202125A (en) 1981-06-08 1981-06-08 Variable reference voltage generating circuit

Country Status (1)

Country Link
JP (1) JPS57202125A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62150935A (en) * 1985-12-24 1987-07-04 Nec Corp Reference voltage generating circuit
FR2642585A1 (en) * 1989-01-31 1990-08-03 Jaeger Device for shaping frequency analog signals
FR2642588A1 (en) * 1989-01-31 1990-08-03 Jaeger Device for shaping frequency analog signals, with high dynamic range
FR2642587A1 (en) * 1989-01-31 1990-08-03 Jaeger Enhancements to devices effecting a shaping of frequency analog signals
FR2642586A1 (en) * 1989-01-31 1990-08-03 Jaeger Device for shaping frequency analog signals, exhibiting useful pulses of positive or negative polarity
DE102009058793B4 (en) * 2009-06-12 2015-09-17 Analog Devices Inc. Digital-to-analog converter with circuit architectures to eliminate switch losses

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49123258A (en) * 1973-03-29 1974-11-26
JPS5560333A (en) * 1978-10-28 1980-05-07 Sony Corp Digital-to-analog converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49123258A (en) * 1973-03-29 1974-11-26
JPS5560333A (en) * 1978-10-28 1980-05-07 Sony Corp Digital-to-analog converter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62150935A (en) * 1985-12-24 1987-07-04 Nec Corp Reference voltage generating circuit
FR2642585A1 (en) * 1989-01-31 1990-08-03 Jaeger Device for shaping frequency analog signals
FR2642588A1 (en) * 1989-01-31 1990-08-03 Jaeger Device for shaping frequency analog signals, with high dynamic range
FR2642587A1 (en) * 1989-01-31 1990-08-03 Jaeger Enhancements to devices effecting a shaping of frequency analog signals
FR2642586A1 (en) * 1989-01-31 1990-08-03 Jaeger Device for shaping frequency analog signals, exhibiting useful pulses of positive or negative polarity
DE102009058793B4 (en) * 2009-06-12 2015-09-17 Analog Devices Inc. Digital-to-analog converter with circuit architectures to eliminate switch losses

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