JPS6478028A - A/d converting circuit - Google Patents
A/d converting circuitInfo
- Publication number
- JPS6478028A JPS6478028A JP23541987A JP23541987A JPS6478028A JP S6478028 A JPS6478028 A JP S6478028A JP 23541987 A JP23541987 A JP 23541987A JP 23541987 A JP23541987 A JP 23541987A JP S6478028 A JPS6478028 A JP S6478028A
- Authority
- JP
- Japan
- Prior art keywords
- order bit
- converter
- comparison system
- plural
- integration type
- 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 realize fast digital conversion with high accuracy by deciding a high-order bit by an A/D converter of prallel comparison system, and deciding only a low-order bit by a double integration type A/D converter. CONSTITUTION:The titled circuit is constituted of the A/D converter 4 of parallel comparison system to decide the high-order bit of a quantity to be digitized by comparing plural reference voltages V0-V3 with an input analog voltage Vx, and plural double integration type A/D converters 10-13 provided with charging capacitors C1, C2... Firstly, the high-order bit of the quantity to be digitized is decided by the A/D converter 4 of parallel comparison system, and one of the plural double integration type A/D converters 10-13 is selected based on the result of the high-order bit, and by inputting the reference voltage with a specific value, a capacitor C for integration is charged in advance. And next, the integration of the input analog voltage Vx is performed for a constant time. In such a way, it is possible to shorten a time to integrate an input voltage, and to reduce an A/D conversion time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23541987A JPS6478028A (en) | 1987-09-18 | 1987-09-18 | A/d converting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23541987A JPS6478028A (en) | 1987-09-18 | 1987-09-18 | A/d converting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6478028A true JPS6478028A (en) | 1989-03-23 |
Family
ID=16985822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23541987A Pending JPS6478028A (en) | 1987-09-18 | 1987-09-18 | A/d converting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6478028A (en) |
-
1987
- 1987-09-18 JP JP23541987A patent/JPS6478028A/en active Pending
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