JPS57211825A - Digital to analog converting circuit - Google Patents

Digital to analog converting circuit

Info

Publication number
JPS57211825A
JPS57211825A JP9648381A JP9648381A JPS57211825A JP S57211825 A JPS57211825 A JP S57211825A JP 9648381 A JP9648381 A JP 9648381A JP 9648381 A JP9648381 A JP 9648381A JP S57211825 A JPS57211825 A JP S57211825A
Authority
JP
Japan
Prior art keywords
current
mosfet
digital
weighted
harmonic components
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
JP9648381A
Other languages
Japanese (ja)
Inventor
Kenzo Masuda
Katsumi Kishimoto
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 Microcomputer System Ltd
Hitachi Ltd
Original Assignee
Hitachi Ltd
Hitachi Microcomputer Engineering 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, Hitachi Microcomputer Engineering Ltd filed Critical Hitachi Ltd
Priority to JP9648381A priority Critical patent/JPS57211825A/en
Publication of JPS57211825A publication Critical patent/JPS57211825A/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)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To obtain analog outputs from which higher harmonic components are removed by driving MOSFETs constituting weighted constant current sources through time constant circuits. CONSTITUTION:Since the size ratio W/L of channel width to channel length is set to S/L, 2W/L-2<n>W/L in MOSFETs Q0-Qn constituting constant current sources, the current is weighted at I, 2I-2nI. Inverted signals 2<0>-2<n> of digital signals are applied to the gates of the MOSFET Q0-Qn through inverters IV0-IVn and time constant circuits consisting of resistances R0-Rn and capacitors C0-Cn. Consequently the current outputs of the MOSFET Q0-Qn are gradually raised, so that higher harmonic components included in the current I0 outputted from an output terminal P1 is extremely reduced.
JP9648381A 1981-06-24 1981-06-24 Digital to analog converting circuit Pending JPS57211825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9648381A JPS57211825A (en) 1981-06-24 1981-06-24 Digital to analog converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9648381A JPS57211825A (en) 1981-06-24 1981-06-24 Digital to analog converting circuit

Publications (1)

Publication Number Publication Date
JPS57211825A true JPS57211825A (en) 1982-12-25

Family

ID=14166300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9648381A Pending JPS57211825A (en) 1981-06-24 1981-06-24 Digital to analog converting circuit

Country Status (1)

Country Link
JP (1) JPS57211825A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01157619A (en) * 1987-12-15 1989-06-20 Matsushita Electric Ind Co Ltd Digital/analog converting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01157619A (en) * 1987-12-15 1989-06-20 Matsushita Electric Ind Co Ltd Digital/analog converting circuit

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