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SE8803876D0 - DEVICE TO PREVENT A CRYSTALOSCILLATOR LOCATED TO SWING AT AN OVERTON FREQUENCY - Google Patents

DEVICE TO PREVENT A CRYSTALOSCILLATOR LOCATED TO SWING AT AN OVERTON FREQUENCY

Info

Publication number
SE8803876D0
SE8803876D0 SE19888803876A SE8803876A SE8803876D0 SE 8803876 D0 SE8803876 D0 SE 8803876D0 SE 19888803876 A SE19888803876 A SE 19888803876A SE 8803876 A SE8803876 A SE 8803876A SE 8803876 D0 SE8803876 D0 SE 8803876D0
Authority
SE
Sweden
Prior art keywords
frequency
oscillator
signal
crystal
returned
Prior art date
Application number
SE19888803876A
Other languages
Swedish (sv)
Other versions
SE462359B (en
Inventor
*Hammarberg L
Original Assignee
Ellemtel Utvecklings Ab
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 Ellemtel Utvecklings Ab filed Critical Ellemtel Utvecklings Ab
Priority to SE8803876A priority Critical patent/SE462359B/en
Publication of SE8803876D0 publication Critical patent/SE8803876D0/en
Publication of SE462359B publication Critical patent/SE462359B/en

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
    • H03B1/00—Details
    • H03B1/04—Reducing undesired oscillations, e.g. harmonics
    • 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
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)

Abstract

A device for preventing a crystal oscillator 11,12 being prevented from oscillating in the event of a harmonic frequency in the crystal 11 in the oscillator. The device comprises a feedback circuit and at least one frequency divider 14a, 14b, . which divides the frequency of the oscillator's output signal by an odd whole number, preferably three and five, etc. A signal which has the same frequency as the signal(s) formed by means of the frequency division is returned to the crystal as an interference voltage. If the oscillator starts to oscillate on any of the harmonics which correspond to the abovementioned whole numbers, for example third or fifth harmonics, it is caused by the returned signal to change over to oscillating at the basic tone frequency, as the returned signal contains this frequency. <IMAGE>
SE8803876A 1988-10-28 1988-10-28 Device for preventing a crystal oscillator being prevented from oscillating in the event of a harmonic frequency SE462359B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE8803876A SE462359B (en) 1988-10-28 1988-10-28 Device for preventing a crystal oscillator being prevented from oscillating in the event of a harmonic frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8803876A SE462359B (en) 1988-10-28 1988-10-28 Device for preventing a crystal oscillator being prevented from oscillating in the event of a harmonic frequency

Publications (2)

Publication Number Publication Date
SE8803876D0 true SE8803876D0 (en) 1988-10-28
SE462359B SE462359B (en) 1990-06-11

Family

ID=20373773

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8803876A SE462359B (en) 1988-10-28 1988-10-28 Device for preventing a crystal oscillator being prevented from oscillating in the event of a harmonic frequency

Country Status (1)

Country Link
SE (1) SE462359B (en)

Also Published As

Publication number Publication date
SE462359B (en) 1990-06-11

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