JPS5467754A - Ad converter - Google Patents
Ad converterInfo
- 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
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
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)
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 |
-
1977
- 1977-11-09 JP JP13492477A patent/JPS5467754A/en active Pending
Cited By (2)
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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