GB2007450A - Oscillator Circuit - Google Patents

Oscillator Circuit

Info

Publication number
GB2007450A
GB2007450A GB7836925A GB7836925A GB2007450A GB 2007450 A GB2007450 A GB 2007450A GB 7836925 A GB7836925 A GB 7836925A GB 7836925 A GB7836925 A GB 7836925A GB 2007450 A GB2007450 A GB 2007450A
Authority
GB
United Kingdom
Prior art keywords
oscillator
frequency
duty cycle
value set
circuit
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Withdrawn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
GB7836925A
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.)
Citizen Watch Co Ltd
Original Assignee
Citizen Watch Co 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 Citizen Watch Co Ltd filed Critical Citizen Watch Co Ltd
Publication of GB2007450A publication Critical patent/GB2007450A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/02—Details
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
    • G04F5/04—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses
    • G04F5/06—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses using piezoelectric resonators
    • 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
    • H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element

Abstract

In an oscillator circuit, a frequency determining element such as a capacitor is divided into two parts with one part C2 being made alternately operative and inoperative in accordance with a control signal whose duty cycle, frequency or both are varied for adjustment of the average oscillator frequency. The oscillator may be a quartz oscillator including CMOS transistors for use in an electronic timepiece wherein the oscillation frequency is desired to be adjusting to a predetermined value corresponding to the value set in a circuit 38. The control pulse CK for switching C2 is initiated by the output of the final stage of a counter divider 34 going low and terminated when a comparator 36 detects equality of the count state with the value set in 38 and defining the duty cycle. The duty cycle may alternatively be defined by an adjustable monostable multivibrator periodically triggered by a divided output of the oscillator. <IMAGE>
GB7836925A 1977-09-17 1978-09-15 Oscillator Circuit Withdrawn GB2007450A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11198977A JPS5445558A (en) 1977-09-17 1977-09-17 Frequency adjusting set for oscillator

Publications (1)

Publication Number Publication Date
GB2007450A true GB2007450A (en) 1979-05-16

Family

ID=14575147

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7836925A Withdrawn GB2007450A (en) 1977-09-17 1978-09-15 Oscillator Circuit

Country Status (2)

Country Link
JP (1) JPS5445558A (en)
GB (1) GB2007450A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036785A1 (en) * 1979-10-05 1981-04-16 Kabushiki Kaisha Seikosha, Tokyo OSCILLATOR CIRCUIT
DE3039156A1 (en) 1979-10-16 1981-04-30 Kabushiki Kaisha Seikosha, Tokyo OSCILLATOR CIRCUIT
FR2513041A1 (en) * 1981-09-15 1983-03-18 Thomson Csf Mat Tel PLL varicap diode piezoelectric oscillator - has digital frequency divider feeding phase comparator supplied with reference to select correction speed
EP0404230A2 (en) * 1989-06-20 1990-12-27 Philips Patentverwaltung GmbH Phase locked loop
FR2651049A1 (en) * 1989-08-17 1991-02-22 Gold Star Electronics PROGRAMMABLE SQUARE WAVE GENERATOR
EP0625826A1 (en) * 1993-04-19 1994-11-23 Codex Corporation Programmable frequency divider in a phase lock loop
US5481228A (en) * 1993-10-15 1996-01-02 Hewlett-Packard Corporation Method and apparatus for controlling oscillator duty cycle
US6124764A (en) * 1999-01-22 2000-09-26 Telefonaktiebolaget Lm Ericsson Stable low-power oscillator
WO2009038587A1 (en) * 2007-09-21 2009-03-26 Qualcomm Incorporated Signal generator with adjustable frequency
GB2454364A (en) * 2007-11-02 2009-05-06 Eosemi Ltd A programmable oscillator circuit with fine frequency resolution and low jitter
US7965805B2 (en) 2007-09-21 2011-06-21 Qualcomm Incorporated Signal generator with signal tracking
US8385474B2 (en) 2007-09-21 2013-02-26 Qualcomm Incorporated Signal generator with adjustable frequency
US8446976B2 (en) 2007-09-21 2013-05-21 Qualcomm Incorporated Signal generator with adjustable phase

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5747070B2 (en) * 2013-12-07 2015-07-08 株式会社アイカデザイン Phase-locked loop circuit and oscillation method

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036785A1 (en) * 1979-10-05 1981-04-16 Kabushiki Kaisha Seikosha, Tokyo OSCILLATOR CIRCUIT
US4583059A (en) * 1979-10-05 1986-04-15 Seikosha Co., Ltd. Adjustable frequency crystal oscillator with temperature compensation
DE3039156A1 (en) 1979-10-16 1981-04-30 Kabushiki Kaisha Seikosha, Tokyo OSCILLATOR CIRCUIT
US4376919A (en) * 1979-10-16 1983-03-15 Seikosha Co., Ltd. Circuitry for switching effective electrode area on a crystal in a crystal oscillator to vary the oscillation frequency
FR2513041A1 (en) * 1981-09-15 1983-03-18 Thomson Csf Mat Tel PLL varicap diode piezoelectric oscillator - has digital frequency divider feeding phase comparator supplied with reference to select correction speed
EP0404230A2 (en) * 1989-06-20 1990-12-27 Philips Patentverwaltung GmbH Phase locked loop
EP0404230A3 (en) * 1989-06-20 1991-04-17 Philips Patentverwaltung GmbH Phase locked loop
FR2651049A1 (en) * 1989-08-17 1991-02-22 Gold Star Electronics PROGRAMMABLE SQUARE WAVE GENERATOR
EP0625826A1 (en) * 1993-04-19 1994-11-23 Codex Corporation Programmable frequency divider in a phase lock loop
US5481228A (en) * 1993-10-15 1996-01-02 Hewlett-Packard Corporation Method and apparatus for controlling oscillator duty cycle
US6124764A (en) * 1999-01-22 2000-09-26 Telefonaktiebolaget Lm Ericsson Stable low-power oscillator
WO2009038587A1 (en) * 2007-09-21 2009-03-26 Qualcomm Incorporated Signal generator with adjustable frequency
WO2009038589A1 (en) * 2007-09-21 2009-03-26 Qualcomm Incorporated Signal generator with signal tracking
US7965805B2 (en) 2007-09-21 2011-06-21 Qualcomm Incorporated Signal generator with signal tracking
US8385474B2 (en) 2007-09-21 2013-02-26 Qualcomm Incorporated Signal generator with adjustable frequency
US8446976B2 (en) 2007-09-21 2013-05-21 Qualcomm Incorporated Signal generator with adjustable phase
GB2454364A (en) * 2007-11-02 2009-05-06 Eosemi Ltd A programmable oscillator circuit with fine frequency resolution and low jitter

Also Published As

Publication number Publication date
JPS5445558A (en) 1979-04-10

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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)