JPS6458124A - A/d conversion circuit - Google Patents
A/d conversion circuitInfo
- Publication number
- JPS6458124A JPS6458124A JP21435587A JP21435587A JPS6458124A JP S6458124 A JPS6458124 A JP S6458124A JP 21435587 A JP21435587 A JP 21435587A JP 21435587 A JP21435587 A JP 21435587A JP S6458124 A JPS6458124 A JP S6458124A
- Authority
- JP
- Japan
- Prior art keywords
- counter
- vco
- count
- fluctuation
- voltage
- 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 eliminate the effect of a characteristic change in the voltage versus frequency due to temperature fluctuation of a voltage controlled oscillation circuit (VCO), power voltage fluctuation and process fluctuation by using a couple of VCOs so as to obtain the relative value of mutual oscillation characteristics. CONSTITUTION:The titled A/D conversion circuit consists of 1st and 2nd VCOs 1, 2, 1st and 2nd counters 5, 6 and a control circuit 4. A frequency fk in response to the reference voltage is generated by the 2nd VCO 2 and up to 2<n> is counted by the 2nd counter 6. A frequency fin in response to the input is generated by the 1st VCO 1 and counted by the 1st counter 5. The control circuit 4 starts the count of the 1st and 2nd counters 5, 6 simultaneously and when the 2nd counter 6 counts by 2<n>, the count of the 1st counter 5 is stopped. In this case, let the count result of the 1st counter 5 be N, the count result N of the 1st counter 5 gives n-bit A/D conversion output.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21435587A JPS6458124A (en) | 1987-08-28 | 1987-08-28 | A/d conversion circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21435587A JPS6458124A (en) | 1987-08-28 | 1987-08-28 | A/d conversion circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6458124A true JPS6458124A (en) | 1989-03-06 |
Family
ID=16654406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21435587A Pending JPS6458124A (en) | 1987-08-28 | 1987-08-28 | A/d conversion circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6458124A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006126338A1 (en) | 2005-05-27 | 2006-11-30 | Fuetrek Co., Ltd | Analog/digital converter |
US20150311909A1 (en) * | 2014-04-29 | 2015-10-29 | Honeywell International Inc. | Converter for analog inputs |
-
1987
- 1987-08-28 JP JP21435587A patent/JPS6458124A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006126338A1 (en) | 2005-05-27 | 2006-11-30 | Fuetrek Co., Ltd | Analog/digital converter |
EP1885068A1 (en) * | 2005-05-27 | 2008-02-06 | Fuetrek Co. Ltd. | Analog/digital converter |
EP1885068A4 (en) * | 2005-05-27 | 2008-11-05 | Fuetrek Co Ltd | Analog/digital converter |
US20150311909A1 (en) * | 2014-04-29 | 2015-10-29 | Honeywell International Inc. | Converter for analog inputs |
US9246501B2 (en) * | 2014-04-29 | 2016-01-26 | Honeywell International Inc. | Converter for analog inputs |
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