JPS57143920A - Analog-to-digital converting circuit - Google Patents

Analog-to-digital converting circuit

Info

Publication number
JPS57143920A
JPS57143920A JP2971381A JP2971381A JPS57143920A JP S57143920 A JPS57143920 A JP S57143920A JP 2971381 A JP2971381 A JP 2971381A JP 2971381 A JP2971381 A JP 2971381A JP S57143920 A JPS57143920 A JP S57143920A
Authority
JP
Japan
Prior art keywords
signal
circuit
counting
sent
converting circuit
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
JP2971381A
Other languages
Japanese (ja)
Inventor
Shigenori Kodama
Yoshikatsu Sato
Hiromichi Jumonji
Masami Kihara
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2971381A priority Critical patent/JPS57143920A/en
Publication of JPS57143920A publication Critical patent/JPS57143920A/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
    • H03M1/12—Analogue/digital converters
    • H03M1/48—Servo-type converters

Abstract

PURPOSE:To obtain high conversion precision without the bit-by-bit adjustment of a counting signal, by using a voltage comparing circuit, a D/A converting circuit, a reversible counting circuit, a switch circuit, and a frequency divider. CONSTITUTION:A voltage comparing circuit 2 compares an input signal (a) from an input terminal 1 with a signal (b) from a D/A converting circuit 12 to supply a reversible counting circuit 4 with a calculation control signal (h) which has a high or low level according to whether the signal (a) has a higher voltage or not. While the signal (a) arrives, a switch circuit 6 is closed by a low-level control input signal (g) from a control input terminal 5 and clock pulses (p) from a frequency divider 14 are sent to and counted by the counting circuit 4; and its output is added to or subtracted from a counting signal (d) in accordance with whether the signal (h) has the high or low level, and the signal (d) is outputted from an output terminal 8 and also sent to the circuit 12. A signal (b) from the circuit 12 is outputted from an output terminal 11 and also sent to the circuit 2.
JP2971381A 1981-03-02 1981-03-02 Analog-to-digital converting circuit Pending JPS57143920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2971381A JPS57143920A (en) 1981-03-02 1981-03-02 Analog-to-digital converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2971381A JPS57143920A (en) 1981-03-02 1981-03-02 Analog-to-digital converting circuit

Publications (1)

Publication Number Publication Date
JPS57143920A true JPS57143920A (en) 1982-09-06

Family

ID=12283742

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2971381A Pending JPS57143920A (en) 1981-03-02 1981-03-02 Analog-to-digital converting circuit

Country Status (1)

Country Link
JP (1) JPS57143920A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49111572A (en) * 1973-01-30 1974-10-24
JPS5431265A (en) * 1977-08-15 1979-03-08 Yokogawa Hokushin Electric Corp Analog-digital converter
JPS54158155A (en) * 1978-06-02 1979-12-13 Kubota Ltd Zero tracking circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49111572A (en) * 1973-01-30 1974-10-24
JPS5431265A (en) * 1977-08-15 1979-03-08 Yokogawa Hokushin Electric Corp Analog-digital converter
JPS54158155A (en) * 1978-06-02 1979-12-13 Kubota Ltd Zero tracking circuit

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