JPS5763931A - Inverting circut for reference voltage - Google Patents

Inverting circut for reference voltage

Info

Publication number
JPS5763931A
JPS5763931A JP13881780A JP13881780A JPS5763931A JP S5763931 A JPS5763931 A JP S5763931A JP 13881780 A JP13881780 A JP 13881780A JP 13881780 A JP13881780 A JP 13881780A JP S5763931 A JPS5763931 A JP S5763931A
Authority
JP
Japan
Prior art keywords
voltage
closed
reference voltage
capacitor
vref
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
JP13881780A
Other languages
Japanese (ja)
Inventor
Takao Harakawa
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 JP13881780A priority Critical patent/JPS5763931A/en
Publication of JPS5763931A publication Critical patent/JPS5763931A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/005—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements using switched capacitors, e.g. dynamic amplifiers; using switched capacitors as resistors in differential amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit

Landscapes

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

Abstract

PURPOSE:To prevent the oscillation of a reference voltage inverting circuit and to reduce the area of a chip, by providing the 2nd capacitor and a switch between the earth and the operational amplifier of the reference voltage inverting circuit composed of the 1st capacitor, a polarity change-over switch and the operational amplifier. CONSTITUTION:With analog switches S1 and S5 closed, a capacitor (C) 11 is charged with a reference voltage VREF and after the charging, the S1 is opened, an S3 is closed, and an S4' is closed by being set at the S3 side. At this time, the charge of the C11 moves to a C12 and the positive input terminal voltage V<+> of an operational amplifier 8 becomes lower than the VREF, so that a voltage V0 having the same polarity with the voltage VREF is developed at the output of the amplifier 8. To equalize the voltage V0 to a voltage when the C12 is not provided, the ratio of feedback is decreased by increasing the resistance ratio R1/R2, thus increasing phase tolerance. With the S1 and S5 closed, the C11 is charged with the voltage VREF and after the charging, the S1 and S5 are opened, an S2 and an S6 are closed, and the S4' is placed at the S6 side. At this time, a -V0 having the same value with and the opposite polarity to the last output voltage is developed at the output of the amplifier 8. Because of the increase in phase tolerance, oscillations are prevented and only small chip area is required.
JP13881780A 1980-10-06 1980-10-06 Inverting circut for reference voltage Pending JPS5763931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13881780A JPS5763931A (en) 1980-10-06 1980-10-06 Inverting circut for reference voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13881780A JPS5763931A (en) 1980-10-06 1980-10-06 Inverting circut for reference voltage

Publications (1)

Publication Number Publication Date
JPS5763931A true JPS5763931A (en) 1982-04-17

Family

ID=15230922

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13881780A Pending JPS5763931A (en) 1980-10-06 1980-10-06 Inverting circut for reference voltage

Country Status (1)

Country Link
JP (1) JPS5763931A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950612A (en) * 1982-09-16 1984-03-23 Hitachi Ltd Analog-digital converter
JPS6073847U (en) * 1983-10-28 1985-05-24 いすゞ自動車株式会社 Fuel injection pump starting advance device
US5187421A (en) * 1988-08-30 1993-02-16 Kabushiki Kaisha Enu-Esu Electrostatic transformer
JPH0697740A (en) * 1992-09-16 1994-04-08 Matsushita Electric Ind Co Ltd Reference voltage generating circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950612A (en) * 1982-09-16 1984-03-23 Hitachi Ltd Analog-digital converter
JPS6073847U (en) * 1983-10-28 1985-05-24 いすゞ自動車株式会社 Fuel injection pump starting advance device
JPH037547Y2 (en) * 1983-10-28 1991-02-25
US5187421A (en) * 1988-08-30 1993-02-16 Kabushiki Kaisha Enu-Esu Electrostatic transformer
JPH0697740A (en) * 1992-09-16 1994-04-08 Matsushita Electric Ind Co Ltd Reference voltage generating circuit

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