GB2016841A - Analog to digital conversion apparatus - Google Patents
Analog to digital conversion apparatusInfo
- Publication number
- GB2016841A GB2016841A GB7909340A GB7909340A GB2016841A GB 2016841 A GB2016841 A GB 2016841A GB 7909340 A GB7909340 A GB 7909340A GB 7909340 A GB7909340 A GB 7909340A GB 2016841 A GB2016841 A GB 2016841A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- voltage
- potentiometer
- predetermined period
- wiper
- 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.)
- Granted
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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
- H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
- H03J5/0272—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer
- H03J5/0281—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer the digital values being held in an auxiliary non erasable memory
-
- 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)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Theoretical Computer Science (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
For converting the setting of a potentiometer to a binary word, e.g. for controlling the frequency of a local oscillator signal generated in a phase locked loop of a radio receiver tuning system, conversion circuitry includes a voltage comparator (49) having a first input (-) coupled to the wiper (27) of the potentiometer (31) and a second input (+) coupled to a first capacitor (45) which is charged during a first predetermined period. The time at which the voltage developed across the first capacitor (45) exceeds the voltage at the wiper (27), and produces a change of the output level from the comparator (49), determines the binary word, e.g. according to the count then reached by a counter (35). To self-stabilize the conversion circuitry, a second capacitor (59) for developing the reference voltage for the potentiometer (31) is charged during a second predetermined period in accordance with the level of the voltage developed across the first capacitor (45) at the end of the first predetermined period. <IMAGE>
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7909340A GB2016841B (en) | 1978-03-20 | 1979-03-16 | Analogue to digital conversion apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1099978 | 1978-03-20 | ||
GB7909340A GB2016841B (en) | 1978-03-20 | 1979-03-16 | Analogue to digital conversion apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2016841A true GB2016841A (en) | 1979-09-26 |
GB2016841B GB2016841B (en) | 1982-06-03 |
Family
ID=26247921
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7909340A Expired GB2016841B (en) | 1978-03-20 | 1979-03-16 | Analogue to digital conversion apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2016841B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2116796A (en) * | 1982-03-09 | 1983-09-28 | Bowthorpe Holdings Plc | Data input arrangement |
EP0165865A2 (en) * | 1984-06-14 | 1985-12-27 | Fairchild Semiconductor Corporation | Method and apparatus for testing integrated circuits |
EP0252852A1 (en) * | 1986-07-10 | 1988-01-13 | Ciapem | Device for feeding data into a microprocessor, in particular for controlling a washing machine |
-
1979
- 1979-03-16 GB GB7909340A patent/GB2016841B/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2116796A (en) * | 1982-03-09 | 1983-09-28 | Bowthorpe Holdings Plc | Data input arrangement |
EP0165865A2 (en) * | 1984-06-14 | 1985-12-27 | Fairchild Semiconductor Corporation | Method and apparatus for testing integrated circuits |
EP0165865A3 (en) * | 1984-06-14 | 1988-12-14 | Fairchild Semiconductor Corporation | Method and apparatus for testing integrated circuits |
EP0252852A1 (en) * | 1986-07-10 | 1988-01-13 | Ciapem | Device for feeding data into a microprocessor, in particular for controlling a washing machine |
FR2601473A1 (en) * | 1986-07-10 | 1988-01-15 | Ciapem | DEVICE FOR INTRODUCING DATA IN A MICROPROCESSOR, IN PARTICULAR FOR CONTROLLING A WASHING MACHINE |
Also Published As
Publication number | Publication date |
---|---|
GB2016841B (en) | 1982-06-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |