JPS6412723A - A/d converter with clamping circuit - Google Patents
A/d converter with clamping circuitInfo
- Publication number
- JPS6412723A JPS6412723A JP17003787A JP17003787A JPS6412723A JP S6412723 A JPS6412723 A JP S6412723A JP 17003787 A JP17003787 A JP 17003787A JP 17003787 A JP17003787 A JP 17003787A JP S6412723 A JPS6412723 A JP S6412723A
- Authority
- JP
- Japan
- Prior art keywords
- clamp
- amp108
- reference voltage
- circuit
- turned
- 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 an error in A/D conversion without increasing an area or complicating a circuit, by measuring the value of digital output in a period while a clamp signal is set at a level HI, and varying clamp reference potential supplied to a clamping circuit by the value. CONSTITUTION:When the clamp signal goes to the level HI, switches SW109 and SW111 are turned ON, and a switch SW110 is turned OFF, and the output of a buffer amplifier A106 is operated so as to be conformed with the clamp reference voltage 100 impressed on the non-inversion input of an OP-AMP108. At this time, a reference voltage which offsets -(V10108 +V10113) is selected, and it is supplied to the non-inversion input of the OP-AMP108 as the clamp reference voltage 100. Therefore, no conversion error is generated even when the OP-AMP108 or a comparator group 113 is provided with a large offset voltage. Accordingly, it is possible to make the area or the increase of the number of elements to obtain a relative accuracy required to realize a low offset in an on-going device, or the complexity of the circuit unnecessary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17003787A JPS6412723A (en) | 1987-07-07 | 1987-07-07 | A/d converter with clamping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17003787A JPS6412723A (en) | 1987-07-07 | 1987-07-07 | A/d converter with clamping circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6412723A true JPS6412723A (en) | 1989-01-17 |
Family
ID=15897438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17003787A Pending JPS6412723A (en) | 1987-07-07 | 1987-07-07 | A/d converter with clamping circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6412723A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5103090A (en) * | 1989-08-24 | 1992-04-07 | Optrocom Systems Ltd. | Optical angle measuring method and apparatus particularly for machine tools using polygons with light reflecting facets |
| US5110757A (en) * | 1990-12-19 | 1992-05-05 | North American Philips Corp. | Formation of composite monosilicon/polysilicon layer using reduced-temperature two-step silicon deposition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5225556A (en) * | 1975-08-22 | 1977-02-25 | Hitachi Ltd | Analog digital converter |
| JPS5289449A (en) * | 1976-01-21 | 1977-07-27 | Nec Corp | Level adjusting device |
| JPS5323553A (en) * | 1976-08-18 | 1978-03-04 | Toshiba Corp | Encoder circu it |
-
1987
- 1987-07-07 JP JP17003787A patent/JPS6412723A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5225556A (en) * | 1975-08-22 | 1977-02-25 | Hitachi Ltd | Analog digital converter |
| JPS5289449A (en) * | 1976-01-21 | 1977-07-27 | Nec Corp | Level adjusting device |
| JPS5323553A (en) * | 1976-08-18 | 1978-03-04 | Toshiba Corp | Encoder circu it |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5103090A (en) * | 1989-08-24 | 1992-04-07 | Optrocom Systems Ltd. | Optical angle measuring method and apparatus particularly for machine tools using polygons with light reflecting facets |
| US5110757A (en) * | 1990-12-19 | 1992-05-05 | North American Philips Corp. | Formation of composite monosilicon/polysilicon layer using reduced-temperature two-step silicon deposition |
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