JPS5467754A - Ad converter - Google Patents

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Publication number
JPS5467754A
JPS5467754A JP13492477A JP13492477A JPS5467754A JP S5467754 A JPS5467754 A JP S5467754A JP 13492477 A JP13492477 A JP 13492477A JP 13492477 A JP13492477 A JP 13492477A JP S5467754 A JPS5467754 A JP S5467754A
Authority
JP
Japan
Prior art keywords
switches
range
voltage
operational amplifier
input
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
JP13492477A
Other languages
Japanese (ja)
Inventor
Shigeru Okamura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP13492477A priority Critical patent/JPS5467754A/en
Publication of JPS5467754A publication Critical patent/JPS5467754A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain an AD converter which can control the input range digitally without a number of precise resistors and analogue switches.
CONSTITUTION: Since resistance network 21 and input resistor 22 are constituted by R and 2R, the relation between voltage V1 of analogue signal input 1 and output voltage VO of operational amplifier 10 is shown according to the state of current switches A1 to An as follows; VO/V1=-1/[(a1/21)+(a2/22)+(an/2n)]= -2n/(2n-1a1+2n-2a2+...+an). However, 1 or 0 is used for ak=K=1 to n according to the truning-on and off of current switches A1 to An. Therefore, by controlling switches A1 to An from the external, the ratio of VO/V1 can be controlled within the range from (-2n/2n-1) to (-2n) in 2n-1-number stages. That is, one of gains in 2n-1-number stages is selected according to the range of analogue signal input voltage V1, and the output voltage of operational amplifier 10 is determined.
COPYRIGHT: (C)1979,JPO&Japio
JP13492477A 1977-11-09 1977-11-09 Ad converter Pending JPS5467754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13492477A JPS5467754A (en) 1977-11-09 1977-11-09 Ad converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13492477A JPS5467754A (en) 1977-11-09 1977-11-09 Ad converter

Publications (1)

Publication Number Publication Date
JPS5467754A true JPS5467754A (en) 1979-05-31

Family

ID=15139715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13492477A Pending JPS5467754A (en) 1977-11-09 1977-11-09 Ad converter

Country Status (1)

Country Link
JP (1) JPS5467754A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5696214A (en) * 1979-12-28 1981-08-04 Nippon Kogaku Kk <Nikon> Dividing/reading circuit for high precision signal
JPS6313422A (en) * 1986-07-03 1988-01-20 Fujitsu Ten Ltd Analog-digital conversion circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5696214A (en) * 1979-12-28 1981-08-04 Nippon Kogaku Kk <Nikon> Dividing/reading circuit for high precision signal
JPS6313422A (en) * 1986-07-03 1988-01-20 Fujitsu Ten Ltd Analog-digital conversion circuit

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