GB2016841A - Analog to digital conversion apparatus - Google Patents

Analog to digital conversion apparatus

Info

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
Application number
GB7909340A
Other versions
GB2016841B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Priority to GB7909340A priority Critical patent/GB2016841B/en
Publication of GB2016841A publication Critical patent/GB2016841A/en
Application granted granted Critical
Publication of GB2016841B publication Critical patent/GB2016841B/en
Expired legal-status Critical Current

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>
GB7909340A 1978-03-20 1979-03-16 Analogue to digital conversion apparatus Expired GB2016841B (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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