JPS55163915A - Electric current output d/a converting circuit - Google Patents

Electric current output d/a converting circuit

Info

Publication number
JPS55163915A
JPS55163915A JP7140879A JP7140879A JPS55163915A JP S55163915 A JPS55163915 A JP S55163915A JP 7140879 A JP7140879 A JP 7140879A JP 7140879 A JP7140879 A JP 7140879A JP S55163915 A JPS55163915 A JP S55163915A
Authority
JP
Japan
Prior art keywords
output
current
gate
unconductive
flow
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
JP7140879A
Other languages
Japanese (ja)
Inventor
Tojiro Takegawa
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 Corp
Original Assignee
NEC Corp
Nippon Electric 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 Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7140879A priority Critical patent/JPS55163915A/en
Publication of JPS55163915A publication Critical patent/JPS55163915A/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

Abstract

PURPOSE:To make an output current variable by providing the method of generating a bias voltage for an output transistor at the drain of IGFET and the method of switching the gate of the output transistor between the bias voltage and the earth potential. CONSTITUTION:When the input terminal of I1 is held at a high level and the input terminals of I2 and I3 are both at a low level, insulating-gate fieled effect transistor IGFETE15 conducts and IGFETE16 becomes unconductive to hold the gate of IGFETE12 at the same potential as that at node 12, allowing IGFETE12 to conduct. At this time, IGFETE13 and E14 are unconductive being grounded at the gates, so that a reference current to flow FETE12 will flow to output terminal 6. Next, when I1 and I3 are at the low level and I2 is at the high level, FETE13 conducts and FETE12 and E14 become unconductive, so that a current twice the reference current will flow to terminal 6. Similarly, changing combinations of input levels of I1, I2 and I3 obtains combinations of output currents as many as 2<3> including when the output current is zero, so that the three-bit current output type D/A converter can be obtained.
JP7140879A 1979-06-07 1979-06-07 Electric current output d/a converting circuit Pending JPS55163915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7140879A JPS55163915A (en) 1979-06-07 1979-06-07 Electric current output d/a converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7140879A JPS55163915A (en) 1979-06-07 1979-06-07 Electric current output d/a converting circuit

Publications (1)

Publication Number Publication Date
JPS55163915A true JPS55163915A (en) 1980-12-20

Family

ID=13459650

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7140879A Pending JPS55163915A (en) 1979-06-07 1979-06-07 Electric current output d/a converting circuit

Country Status (1)

Country Link
JP (1) JPS55163915A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176829A (en) * 1981-04-22 1982-10-30 Toshiba Corp Current source circuit for d/a conversion
JPS57178420A (en) * 1981-04-25 1982-11-02 Toshiba Corp D/a converter
JPS5862930A (en) * 1981-09-16 1983-04-14 ブルツクトリ−・コ−ポレ−シヨン Digital-to-analog converter
JPS5960866U (en) * 1982-10-13 1984-04-20 東洋電機製造株式会社 Commutator of rotating electrical machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50159243A (en) * 1974-03-14 1975-12-23
US4045793A (en) * 1975-09-29 1977-08-30 Motorola, Inc. Digital to analog converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50159243A (en) * 1974-03-14 1975-12-23
US4045793A (en) * 1975-09-29 1977-08-30 Motorola, Inc. Digital to analog converter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176829A (en) * 1981-04-22 1982-10-30 Toshiba Corp Current source circuit for d/a conversion
JPS632368B2 (en) * 1981-04-22 1988-01-19 Tokyo Shibaura Electric Co
JPS57178420A (en) * 1981-04-25 1982-11-02 Toshiba Corp D/a converter
JPS5862930A (en) * 1981-09-16 1983-04-14 ブルツクトリ−・コ−ポレ−シヨン Digital-to-analog converter
JPS5960866U (en) * 1982-10-13 1984-04-20 東洋電機製造株式会社 Commutator of rotating electrical machine

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