JPS6474811A - Reference power source circuit - Google Patents

Reference power source circuit

Info

Publication number
JPS6474811A
JPS6474811A JP62233144A JP23314487A JPS6474811A JP S6474811 A JPS6474811 A JP S6474811A JP 62233144 A JP62233144 A JP 62233144A JP 23314487 A JP23314487 A JP 23314487A JP S6474811 A JPS6474811 A JP S6474811A
Authority
JP
Japan
Prior art keywords
power source
voltage
goes
operational
amplifier
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
JP62233144A
Other languages
Japanese (ja)
Inventor
Yasuhiko Abe
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.)
NEC IC Microcomputer Systems Co Ltd
Original Assignee
NEC IC Microcomputer Systems 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 NEC IC Microcomputer Systems Co Ltd filed Critical NEC IC Microcomputer Systems Co Ltd
Priority to JP62233144A priority Critical patent/JPS6474811A/en
Publication of JPS6474811A publication Critical patent/JPS6474811A/en
Pending legal-status Critical Current

Links

Landscapes

  • Manipulation Of Pulses (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To lower the limitation of a package due to the kind of an IC pin by improving a ratio to eliminate a power source noise and to reduce the num ber of mounting processes or a cost, by using two stages of operational amplifiers in series instead of an out-fitting capacitor. CONSTITUTION:Assuming the voltage values of power sources connected to first and second power source terminals 1 and 4 as VDD and VSS, respectively, and resistance values of resistors 2 and 3 as R2 and R3, all of the DC voltages V0 inputted to the input terminals 10, 11, 16, and 17 of operational amplifiers 13 and 19 go to V0=R3(VDD-VSS)/(R2+R3) based on the characteristic of a negative feedback amplifier. A power source noise voltage vn is superposed on the DC voltage V0, and an alternate noise vn is voltage-divided by the resistors 2 and 3, then, goes to vn'=R2vn/(R2+R3). The vn' is outputted from the operational amplifier 7 directly, and the output 14 of the operational ampli fier 13 goes to the vn', and the output 20 of the amplifier 19 goes to (R9R15-R12 R18)v'/R15(R9+R12). By supplying a condition R12/R9=R15/R18, no power source noise vn is outputted to the output terminal 20 of the operational amplifier 10.
JP62233144A 1987-09-16 1987-09-16 Reference power source circuit Pending JPS6474811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62233144A JPS6474811A (en) 1987-09-16 1987-09-16 Reference power source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62233144A JPS6474811A (en) 1987-09-16 1987-09-16 Reference power source circuit

Publications (1)

Publication Number Publication Date
JPS6474811A true JPS6474811A (en) 1989-03-20

Family

ID=16950411

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62233144A Pending JPS6474811A (en) 1987-09-16 1987-09-16 Reference power source circuit

Country Status (1)

Country Link
JP (1) JPS6474811A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024070030A1 (en) * 2022-09-30 2024-04-04 パナソニックオートモーティブシステムズ株式会社 Voltage generation circuit and audio output circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024070030A1 (en) * 2022-09-30 2024-04-04 パナソニックオートモーティブシステムズ株式会社 Voltage generation circuit and audio output circuit

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