GB1444628A - Circuit for the automatic correction of the indication of analogue to digital converters - Google Patents
Circuit for the automatic correction of the indication of analogue to digital convertersInfo
- Publication number
- GB1444628A GB1444628A GB3842773A GB3842773A GB1444628A GB 1444628 A GB1444628 A GB 1444628A GB 3842773 A GB3842773 A GB 3842773A GB 3842773 A GB3842773 A GB 3842773A GB 1444628 A GB1444628 A GB 1444628A
- Authority
- GB
- United Kingdom
- Prior art keywords
- counter
- calibration
- analogue
- time
- reference 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/50—Analogue/digital converters with intermediate conversion to time interval
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
1444628 Analogue to digital converter HARTMAN & BRAUN AG 14 Aug 1973 [14 Aug 1972] 38427/73 Heading H3H In an analogue to digital converter, e.g. of the dual ramp type, calibration is obtained by integrating up a calibration voltage U Cal for a first time interval and integrating down the converter reference voltage U o for a second time interval, any difference between the time at which an output pulse from the comparator 16 occurs and the time the counter 21 attains a predetermined state, e.g. overflows, representing the calibration error which is converted to a direct voltage at 24 and superimposed on the converter reference voltage U o . As shown, a unidirectional counter 21 is continually fed with regular clock pulses from a generator 22. Starting from zero in the counter, U Cal or U x , depending on whether a calibration or measurement is to be performed, is integrated up until the counter 21 overflows. Then U o is integrated down until the comparator 16 gives an output K whereupon the state of the counter is transferred to an indicator 23. For calibration, the counter 21 should be in a predetermined state when K is produced; circuit 20 generates a pulse of width equal to the time difference between signal K and the counter attaining the predetermined state, which pulse is converted to D.C. at 24 and applied to correct the value of the reference voltage U o . Mention is made of the use of a bidirectional counter and of a half-scale zero bias.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2239980A DE2239980C3 (en) | 1972-08-14 | 1972-08-14 | Circuit for automatic correction of the display of analog-digital converters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1444628A true GB1444628A (en) | 1976-08-04 |
Family
ID=5853545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3842773A Expired GB1444628A (en) | 1972-08-14 | 1973-08-14 | Circuit for the automatic correction of the indication of analogue to digital converters |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2239980C3 (en) |
FR (1) | FR2196559B3 (en) |
GB (1) | GB1444628A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114205545A (en) * | 2021-12-11 | 2022-03-18 | 长春长光辰芯光电技术有限公司 | Double-slope double-edge up-counting analog-digital conversion device and conversion method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4344067A (en) * | 1979-11-21 | 1982-08-10 | Motorola, Inc. | Analog to digital converter and method of calibrating same |
-
1972
- 1972-08-14 DE DE2239980A patent/DE2239980C3/en not_active Expired
-
1973
- 1973-08-10 FR FR7329311A patent/FR2196559B3/fr not_active Expired
- 1973-08-14 GB GB3842773A patent/GB1444628A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114205545A (en) * | 2021-12-11 | 2022-03-18 | 长春长光辰芯光电技术有限公司 | Double-slope double-edge up-counting analog-digital conversion device and conversion method thereof |
Also Published As
Publication number | Publication date |
---|---|
FR2196559B3 (en) | 1976-07-23 |
DE2239980B2 (en) | 1976-04-08 |
DE2239980A1 (en) | 1974-03-21 |
FR2196559A1 (en) | 1974-03-15 |
DE2239980C3 (en) | 1979-06-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |