JPS6444126A - A/d and d/a converter - Google Patents
A/d and d/a converterInfo
- Publication number
- JPS6444126A JPS6444126A JP19985287A JP19985287A JPS6444126A JP S6444126 A JPS6444126 A JP S6444126A JP 19985287 A JP19985287 A JP 19985287A JP 19985287 A JP19985287 A JP 19985287A JP S6444126 A JPS6444126 A JP S6444126A
- Authority
- JP
- Japan
- Prior art keywords
- current
- capacitor
- switch
- conversion
- integration
- 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 prevent deterioration in the accuracy of A/D conversion by compensating a leak current of a switch used for electric discharge of an integration device at the D/A conversion in the A/D conversion mode. CONSTITUTION:A switch 7 used for discharging an electric charge in an integration capacitor 8 in the D/A conversion mode is turned off, in the A/D conversion mode. When a voltage corresponding to an analog signal inputted to a terminal 1 is held in the capacitor 8, a current is supplied from a constant power supply circuit 22 to the capacitor 8 and integration is started. Then the voltage of the capacitor 8 is compared with comparison voltages 45-47 at comparators 41-43 and a digital value is obtained by using counters 20, 35, 36 so as to count the period till the output of the comparator is inverted. In such a case, the leakage current of the switch 7 is detected by a leakage current detection circuit 101 and a current equal to the detected current but having an opposite direction is fed from the leak current compensation circuit 102 to the switch 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19985287A JPS6444126A (en) | 1987-08-12 | 1987-08-12 | A/d and d/a converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19985287A JPS6444126A (en) | 1987-08-12 | 1987-08-12 | A/d and d/a converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6444126A true JPS6444126A (en) | 1989-02-16 |
Family
ID=16414723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19985287A Pending JPS6444126A (en) | 1987-08-12 | 1987-08-12 | A/d and d/a converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6444126A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015090351A (en) * | 2013-11-07 | 2015-05-11 | セイコーエプソン株式会社 | Detection device, sensor, electronic device, and moving object |
-
1987
- 1987-08-12 JP JP19985287A patent/JPS6444126A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015090351A (en) * | 2013-11-07 | 2015-05-11 | セイコーエプソン株式会社 | Detection device, sensor, electronic device, and moving object |
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