JPS6444624A - Integral a/d converter - Google Patents
Integral a/d converterInfo
- Publication number
- JPS6444624A JPS6444624A JP20204787A JP20204787A JPS6444624A JP S6444624 A JPS6444624 A JP S6444624A JP 20204787 A JP20204787 A JP 20204787A JP 20204787 A JP20204787 A JP 20204787A JP S6444624 A JPS6444624 A JP S6444624A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- time
- measured
- time counting
- comparison
- 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
Landscapes
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE:To reduce the variance of a measured value due to temperature and that due to the variance of the precision of parts by using a time ratio of the time before crossing between a comparison voltage and a measured voltage to the time before crossing between the comparison voltage and a reference voltage and the reference voltage value to calculate an A/D conversion value of the measured voltage. CONSTITUTION:Charging is started in a constant current charging circuit 2 by the charging start signal from an A/D converting and signal processing part 1, and the comparison voltage of comparators 3 and 4 is linearly raised, and simultaneously, time counting is started in time counting parts 5 and 6. The comparison voltage is compared with a measured voltage V1 and a reference voltage V2 by comparators 3 and 4, and a time t1 when the measured voltage V1 exceeds the comparison voltage is counted by the time counting part 5, and this time counting is stopped when the comparison voltage exceeds the measured voltage V1. Similarly, only a time t2 when the reference voltage V2 is higher than the comparison voltage is counted by the time counting part 4. Counted values of time counting parts 3 and 4 are operated in an A/D conversion value correcting and calculating part 7 after a certain time, and the measured voltage V1 is obtained in accordance with V1=V2Xt1/t2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20204787A JPS6444624A (en) | 1987-08-13 | 1987-08-13 | Integral a/d converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20204787A JPS6444624A (en) | 1987-08-13 | 1987-08-13 | Integral a/d converter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6444624A true JPS6444624A (en) | 1989-02-17 |
Family
ID=16451049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20204787A Pending JPS6444624A (en) | 1987-08-13 | 1987-08-13 | Integral a/d converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6444624A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0958910A1 (en) * | 1998-05-19 | 1999-11-24 | Graf von Montgelas, Max Joseph | Method and apparatus for manufacturing a plastic film |
CN106840440A (en) * | 2017-03-03 | 2017-06-13 | 成都信息工程大学 | A kind of Temperature sampler and temperature acquisition method based on MCU internal comparators |
-
1987
- 1987-08-13 JP JP20204787A patent/JPS6444624A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0958910A1 (en) * | 1998-05-19 | 1999-11-24 | Graf von Montgelas, Max Joseph | Method and apparatus for manufacturing a plastic film |
US6273699B1 (en) | 1998-05-19 | 2001-08-14 | Udo Finke | Device for manufacturing plastic film |
CN106840440A (en) * | 2017-03-03 | 2017-06-13 | 成都信息工程大学 | A kind of Temperature sampler and temperature acquisition method based on MCU internal comparators |
CN106840440B (en) * | 2017-03-03 | 2023-07-28 | 成都信息工程大学 | Temperature collector based on MCU internal comparator and temperature collection method |
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