GB2002157A - Frequency adjustment circuit - Google Patents

Frequency adjustment circuit

Info

Publication number
GB2002157A
GB2002157A GB7830246A GB7830246A GB2002157A GB 2002157 A GB2002157 A GB 2002157A GB 7830246 A GB7830246 A GB 7830246A GB 7830246 A GB7830246 A GB 7830246A GB 2002157 A GB2002157 A GB 2002157A
Authority
GB
United Kingdom
Prior art keywords
circuit
source
clock pulses
frequency
adjusting
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.)
Withdrawn
Application number
GB7830246A
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.)
Fairchild Semiconductor Corp
Original Assignee
Fairchild Camera and Instrument 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 Fairchild Camera and Instrument Corp filed Critical Fairchild Camera and Instrument Corp
Publication of GB2002157A publication Critical patent/GB2002157A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
    • G04G3/022—Circuits for deriving low frequency timing pulses from pulses of higher frequency the desired number of pulses per unit of time being obtained by adding to or substracting from a pulse train one or more pulses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Manipulation Of Pulses (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

A circuit is provided for adjusting the average frequency of signals supplied by a frequency source, for example, in electronic time keeping devices. This circuit is preferably located between a source of clock pulses and other electronic circuitry utilizing signals from the source so that selected numbers of clock pulses may be added to or subtracted from the clock pulses being supplied to the other electronic circuitry. The circuit for adjusting the average frequency includes a first switching device connected in series with a frequency divider, a second switching device connected in parallel with at least the divider, and a control circuit for periodically opening and closing the first and second switching devices. The switching devices may be NAND-gate circuits. <IMAGE>
GB7830246A 1977-08-04 1978-07-18 Frequency adjustment circuit Withdrawn GB2002157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82167477A 1977-08-04 1977-08-04

Publications (1)

Publication Number Publication Date
GB2002157A true GB2002157A (en) 1979-02-14

Family

ID=25234011

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7830246A Withdrawn GB2002157A (en) 1977-08-04 1978-07-18 Frequency adjustment circuit

Country Status (3)

Country Link
JP (1) JPS5428561A (en)
DE (1) DE2833653A1 (en)
GB (1) GB2002157A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004068697A1 (en) * 2003-01-29 2004-08-12 Infineon Technologies Ag Device and method for carrying out frequency synthesis
EP2738629A1 (en) * 2012-11-30 2014-06-04 EM Microelectronic-Marin SA High-precision electronic clock movement and method for adjusting a time base

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5868322A (en) * 1981-10-19 1983-04-23 Matsushita Electric Ind Co Ltd Correcting device for oscillation frequency

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004068697A1 (en) * 2003-01-29 2004-08-12 Infineon Technologies Ag Device and method for carrying out frequency synthesis
US7772929B2 (en) 2003-01-29 2010-08-10 Infineon Technologies Ag Device and method for frequency synthesis
EP2738629A1 (en) * 2012-11-30 2014-06-04 EM Microelectronic-Marin SA High-precision electronic clock movement and method for adjusting a time base

Also Published As

Publication number Publication date
DE2833653A1 (en) 1979-02-15
JPS5428561A (en) 1979-03-03

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)