JPS57203321A - Digital-to-analog converter - Google Patents

Digital-to-analog converter

Info

Publication number
JPS57203321A
JPS57203321A JP8905081A JP8905081A JPS57203321A JP S57203321 A JPS57203321 A JP S57203321A JP 8905081 A JP8905081 A JP 8905081A JP 8905081 A JP8905081 A JP 8905081A JP S57203321 A JPS57203321 A JP S57203321A
Authority
JP
Japan
Prior art keywords
circuit
thin film
film
sio2
semiconductor
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
JP8905081A
Other languages
Japanese (ja)
Inventor
Hiroshi Kitazaki
Ichiro Yamashita
Yoshitaka Yoshikawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8905081A priority Critical patent/JPS57203321A/en
Publication of JPS57203321A publication Critical patent/JPS57203321A/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
    • H03M1/74—Simultaneous conversion
    • H03M1/80—Simultaneous conversion using weighted impedances

Landscapes

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

Abstract

PURPOSE:To realize a monolithic D/A converter having high accuracy, by covering a semiconductor circuit and a thin film circuit with an SiO2 passivation film formed by a sputtering process and protecting these circuits. CONSTITUTION:A semiconductor element 3 such as a reference voltage source circuit, a current switch circuit, etc. is formed within an Si substrate 2, and an SiO2 film 4 is formed on the element 3 by heat oxidation and CVD processes. A thin film resistance element 5 of NiCr alloy is formed on the film 4 in order to obtain a thin film circuit like a weight resistance network circuit, etc. corresponding to the weighting of each bit current. An SiO2 passivation film 9 formed by the sputtering process covers over the semiconductor circuit and the thin film circuit for protection. Thus the protecting effect is increased for the circuits, and a monolithic D/A converter having high accuracy is obtained.
JP8905081A 1981-06-10 1981-06-10 Digital-to-analog converter Pending JPS57203321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8905081A JPS57203321A (en) 1981-06-10 1981-06-10 Digital-to-analog converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8905081A JPS57203321A (en) 1981-06-10 1981-06-10 Digital-to-analog converter

Publications (1)

Publication Number Publication Date
JPS57203321A true JPS57203321A (en) 1982-12-13

Family

ID=13960044

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8905081A Pending JPS57203321A (en) 1981-06-10 1981-06-10 Digital-to-analog converter

Country Status (1)

Country Link
JP (1) JPS57203321A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63227043A (en) * 1987-03-17 1988-09-21 Matsushita Electronics Corp Manufacture of thin film resistance circuit
US5883765A (en) * 1994-03-07 1999-03-16 Commissariat A L'energie Atomique Vertical magnetic head having first and second magnetic materials in specific shapes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63227043A (en) * 1987-03-17 1988-09-21 Matsushita Electronics Corp Manufacture of thin film resistance circuit
US5883765A (en) * 1994-03-07 1999-03-16 Commissariat A L'energie Atomique Vertical magnetic head having first and second magnetic materials in specific shapes
US6167611B1 (en) 1994-03-07 2001-01-02 Commissariat A L'energie Atomique Process for producing a vertical magnetic head

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