JPS57109424A - Analogue-digital converter - Google Patents
Analogue-digital converterInfo
- Publication number
- JPS57109424A JPS57109424A JP18405480A JP18405480A JPS57109424A JP S57109424 A JPS57109424 A JP S57109424A JP 18405480 A JP18405480 A JP 18405480A JP 18405480 A JP18405480 A JP 18405480A JP S57109424 A JPS57109424 A JP S57109424A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- terminals
- switches
- switch
- movable
- 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.)
- Granted
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
- H03M1/34—Analogue value compared with reference values
- H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
- H03M1/46—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter
- H03M1/466—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter using switched capacitors
- H03M1/468—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter using switched capacitors in which the input S/H circuit is merged with the feedback DAC array
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE:To give a number of degrees of freedom to the quantization error distribution for an analogue input voltage, by moving the transfer function for the analogue input voltage in parallel. CONSTITUTION:An analogue switch SW13 is closed, and movable terminals (a) of switches SW11 and SW15 are connected to fixed terminals (c) respectively, and movable terminals (a) of switches SW01-SW04, SW12, SW14, SW16, and SW17 are connected to fixed terminals (b). Then, a voltage VP at a point P is equal to 1/2VR1. Next, movable terminals (a) of switches SW14 and SW17 are moved to fixed terminals (c). Under this state, the movable terminal (a) of the switch SW12 is connected to the terminal (c). Then, the voltage VP is equal to 1/2VR1+1/2LSB, and this voltage is held in a capacitor C' through a voltage comparator 14. Next, the switch SW13 is opened, and switches SW01-SW04, SW11, SW12, and SW14-SW17 are connected to terminals (b), and the switch SW13 is closed, thus taking in an analogue input. The switch SW13 is opened, and movable terminals of switches SW11, SW16, and SW17 are connected to terminals (c). Then, a voltage VQ at a point Q is changed to 1/2VR1+1/2LSB and becomes a reference voltage of the voltage comparator hereafter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18405480A JPS57109424A (en) | 1980-12-26 | 1980-12-26 | Analogue-digital converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18405480A JPS57109424A (en) | 1980-12-26 | 1980-12-26 | Analogue-digital converter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57109424A true JPS57109424A (en) | 1982-07-07 |
JPS636169B2 JPS636169B2 (en) | 1988-02-08 |
Family
ID=16146562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18405480A Granted JPS57109424A (en) | 1980-12-26 | 1980-12-26 | Analogue-digital converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57109424A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62142421A (en) * | 1985-12-17 | 1987-06-25 | Oki Electric Ind Co Ltd | A/d conversion method and a/d convertor used for it |
JPS6416027A (en) * | 1987-07-09 | 1989-01-19 | Oki Electric Ind Co Ltd | A/d converter |
-
1980
- 1980-12-26 JP JP18405480A patent/JPS57109424A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62142421A (en) * | 1985-12-17 | 1987-06-25 | Oki Electric Ind Co Ltd | A/d conversion method and a/d convertor used for it |
JPH0523650B2 (en) * | 1985-12-17 | 1993-04-05 | Oki Electric Ind Co Ltd | |
JPS6416027A (en) * | 1987-07-09 | 1989-01-19 | Oki Electric Ind Co Ltd | A/d converter |
Also Published As
Publication number | Publication date |
---|---|
JPS636169B2 (en) | 1988-02-08 |
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