GB1397288A - Analogue to digital converters - Google Patents
Analogue to digital convertersInfo
- Publication number
- GB1397288A GB1397288A GB5601172A GB5601172A GB1397288A GB 1397288 A GB1397288 A GB 1397288A GB 5601172 A GB5601172 A GB 5601172A GB 5601172 A GB5601172 A GB 5601172A GB 1397288 A GB1397288 A GB 1397288A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vin
- analogue
- current
- comparison signal
- vref
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/255—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with counting of pulses during a period of time proportional to voltage or current, delivered by a pulse generator with fixed frequency
-
- 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)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
1397288 Analogue to digital converter COMARK DATA GROUP 5 Dec 1973 [5 Dec 1972] 56011/72 Heading G4H In an analogue-to-digital converter of the type in which clock pulses are counted during the time taken for a comparison signal to change from an initial value to the value of the input analogue, switches 14, 15 are provided for alternately connecting to the comparator 10 the input analogue Vin and a reference signal Vref which is used for resetting the comparison signal to its starting value which thereby equals Vref plus automatic correction for drift in the comparator 10. If a high gain amplifier (not shown) is included at the input 12, its drift is also compensated. As shown, at the start of a cycle (t 2 in Fig. 2, not shown) Vin is connected to 12, counting gate 33 is enabled, and one of two current generators 20, 21 depending on the sign of Vin, is started, its current being integrated by a capacitor 18 to provide the comparison signal at 11. When this reaches Vin the current generator is stopped and gates 33 disabled. After a delay for settling, which is preferably long enough to obviate the use of latches in the display 37, multivibrator 26, via bistable 27, changes over switches 14, 15 to connect Vref to 12. The other of the current generators 20, 21 is started and the voltage at 11 ramps down until Vref + drift is reached. If Vin is from a thermocouple, non-linearity may be compensated by changing the value of the current from generators 20, 21 when certain counts are reached by counter 35. Multivibrator 26 may be locked on to the clock pulse generator 34. Modifications.-A staircase comparison signal may be used instead of a ramp. The control logic may be formed as a single MOS chip, Fig. 6 (not shown).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5601172A GB1397288A (en) | 1972-12-05 | 1972-12-05 | Analogue to digital converters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5601172A GB1397288A (en) | 1972-12-05 | 1972-12-05 | Analogue to digital converters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1397288A true GB1397288A (en) | 1975-06-11 |
Family
ID=10475515
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5601172A Expired GB1397288A (en) | 1972-12-05 | 1972-12-05 | Analogue to digital converters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1397288A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2144287A (en) * | 1983-07-22 | 1985-02-27 | Nat Res Dev | Analog-to-digital converters for seismometers |
EP0825069A2 (en) * | 1996-08-23 | 1998-02-25 | TEMIC TELEFUNKEN microelectronic GmbH | Method of determining a measured value |
EP0967729A2 (en) * | 1998-06-24 | 1999-12-29 | Taiwan Advanced Sensors Corporation | Autocalibration of an A/D converter within a CMOS type image sensor |
EP4293915A1 (en) * | 2022-06-14 | 2023-12-20 | Pepperl+Fuchs SE | Voltage measuring arrangement with a microcontroller |
-
1972
- 1972-12-05 GB GB5601172A patent/GB1397288A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2144287A (en) * | 1983-07-22 | 1985-02-27 | Nat Res Dev | Analog-to-digital converters for seismometers |
EP0825069A2 (en) * | 1996-08-23 | 1998-02-25 | TEMIC TELEFUNKEN microelectronic GmbH | Method of determining a measured value |
EP0825069A3 (en) * | 1996-08-23 | 1998-11-11 | TEMIC TELEFUNKEN microelectronic GmbH | Method of determining a measured value |
US5963044A (en) * | 1996-08-23 | 1999-10-05 | Temic Telefunken Microelectronic Gmbh | Method for acquiring measured values by comparison with a stepped ramp voltage |
EP0967729A2 (en) * | 1998-06-24 | 1999-12-29 | Taiwan Advanced Sensors Corporation | Autocalibration of an A/D converter within a CMOS type image sensor |
EP0967729A3 (en) * | 1998-06-24 | 2004-03-17 | Taiwan Advanced Sensors Corporation | Autocalibration of an A/D converter within a CMOS type image sensor |
EP4293915A1 (en) * | 2022-06-14 | 2023-12-20 | Pepperl+Fuchs SE | Voltage measuring arrangement with a microcontroller |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |