GB1245578A - A digital measuring instrument including an intergrating analogue-to-digital converter with a clock oscillator and apparatus for phase-locking the operating frequency of the oscillator to a reference frequency - Google Patents

A digital measuring instrument including an intergrating analogue-to-digital converter with a clock oscillator and apparatus for phase-locking the operating frequency of the oscillator to a reference frequency

Info

Publication number
GB1245578A
GB1245578A GB41428/67A GB4142867A GB1245578A GB 1245578 A GB1245578 A GB 1245578A GB 41428/67 A GB41428/67 A GB 41428/67A GB 4142867 A GB4142867 A GB 4142867A GB 1245578 A GB1245578 A GB 1245578A
Authority
GB
United Kingdom
Prior art keywords
oscillator
line
signal
stable
produce
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
Application number
GB41428/67A
Inventor
Brian Edward Howse
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.)
SOLARTON ELECTRIC GROUP Ltd
Original Assignee
SOLARTON ELECTRIC GROUP Ltd
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 SOLARTON ELECTRIC GROUP Ltd filed Critical SOLARTON ELECTRIC GROUP Ltd
Priority to GB41428/67A priority Critical patent/GB1245578A/en
Priority to FR1579840D priority patent/FR1579840A/fr
Publication of GB1245578A publication Critical patent/GB1245578A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
    • H03K5/26—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being duration, interval, position, frequency, or sequence
    • 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
    • H03M1/60—Analogue/digital converters with intermediate conversion to frequency of pulses

Abstract

1,245,578. Automatic phase control. SOLARTRON ELECTRONIC GROUP Ltd. 10 Sept., 1968 [11 Sept., 1967], No. 41428/67. Heading H3A. An analogue/digital converter in which a clock oscillator phase locked to a reference frequency comprises a discriminator responsive to a reference signal to sense periodic deviations of the oscillator frequency from a predetermined multiple of the reference frequency, and means responsive to such sensing to reduce the deviation in a stepwise manner. A mains frequency reference input is squared in unit 11 and divided by two in bi-stable 12 to produce on line 12a a 25 c/s. signal, the positive transitions of which set bi-stable 13 and open gate 14 to pass 1 Mc/s. pulses from oscillator 10 to counter 15. After a a count of 19,999 counter 15 produces an output which resets bi-stable 13. If the oscillator frequency is too high, bi-stable 13 is reset before the signal on line 12a makes its next negative transition, to produce a "1" on line 13b and a "0" on line 13a. When the negative transition occurs, this triggers bi-stable 17 to the state in which Q = 0 and Q = 1. During the 10 ms. preceding a positive transition on line 12a, gate 29 is opened to produce a "1" at its output. During the time that 12a and 13b are both "1", gate 32 passes pulses from oscillation 10 to counters 33, 30 and if more than two pulses are passed, 30 switches to "1". The outputs from units 29, 18, 30 are fed to AND gate 20 and coincident "1's" on all three inputs produce a positive signal on line 21. This is fed to diode pump 23 and integrator 24 to produce a signal to slow down the oscillator. If the oscillator frequency is too low, bistable 13 is not reset until after the signal on line 12a makes its next negative transition. When this transition occurs there is thus still a "1" on 13a and a "0" on 13b, and bi-stable 17 is triggered, to the state in which Q = 1 and Q = 0. In this case, during the time that a "1" exists at the outputs of 29, 30 the gate 19 is opened and a negative signal is produced on line 22. This is fed to diode pump 26 and integrator 24 to produce a signal to speed up the oscillator. Units 30 ... 33 provide a dead zone, no correction being applied unless 33, 30 count an error of at least plus or minus two cycles. Units 30 ... 33 may be omitted, and 19,20 replaced by two input gates.
GB41428/67A 1967-09-11 1967-09-11 A digital measuring instrument including an intergrating analogue-to-digital converter with a clock oscillator and apparatus for phase-locking the operating frequency of the oscillator to a reference frequency Expired GB1245578A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB41428/67A GB1245578A (en) 1967-09-11 1967-09-11 A digital measuring instrument including an intergrating analogue-to-digital converter with a clock oscillator and apparatus for phase-locking the operating frequency of the oscillator to a reference frequency
FR1579840D FR1579840A (en) 1967-09-11 1968-09-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB41428/67A GB1245578A (en) 1967-09-11 1967-09-11 A digital measuring instrument including an intergrating analogue-to-digital converter with a clock oscillator and apparatus for phase-locking the operating frequency of the oscillator to a reference frequency

Publications (1)

Publication Number Publication Date
GB1245578A true GB1245578A (en) 1971-09-08

Family

ID=10419632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB41428/67A Expired GB1245578A (en) 1967-09-11 1967-09-11 A digital measuring instrument including an intergrating analogue-to-digital converter with a clock oscillator and apparatus for phase-locking the operating frequency of the oscillator to a reference frequency

Country Status (2)

Country Link
FR (1) FR1579840A (en)
GB (1) GB1245578A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032256A1 (en) * 1980-08-04 1982-03-18 BBC AG Brown, Boveri & Cie., 5401 Baden, Aargau METHOD AND DEVICE FOR ANALOG-DIGITAL IMPLEMENTATION OF AN ELECTRICAL MEASURED VALUE WITH CHANGEABLE IMPLEMENTATION RATIO

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075577A (en) * 1974-12-30 1978-02-21 International Business Machines Corporation Analog-to-digital conversion apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032256A1 (en) * 1980-08-04 1982-03-18 BBC AG Brown, Boveri & Cie., 5401 Baden, Aargau METHOD AND DEVICE FOR ANALOG-DIGITAL IMPLEMENTATION OF AN ELECTRICAL MEASURED VALUE WITH CHANGEABLE IMPLEMENTATION RATIO

Also Published As

Publication number Publication date
FR1579840A (en) 1969-08-29

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