Oscillators – Solid state active element oscillator – Transistors
Patent
1990-11-08
1992-01-14
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331158, 331113R, H03B 536
Patent
active
050814303
ABSTRACT:
In an overtone crystal oscillator comprising a crystal oscillator having a feedback loop and a resonance amplifier whose amplitude characteristic has an overshoot in the range of the resonant frequency of the resonance amplifier and which is arranged in the feedback loop of the crystal oscillator, the resonant frequency of the resonance amplifier is between the frequency of the overtone to be generated and the next lower oscillation frequency of the crystal oscillator, while signals in the frequency range of the next lower oscillation frequency(ies) in relation to signals in the frequency range of the overtone to be generated in the feedback loop, particularly in the resonance amplifier, have such a phase shift that the overtone crystal oscillator cannot oscillate at the frequencies of the next lower oscillation frequency(ies) and that it only oscillates at the frequency of the overtone to be generated.
REFERENCES:
patent: 3684981 (1972-08-01), Kreitz
patent: 4139826 (1979-02-01), Pradal
patent: 4353039 (1982-10-01), Huntley
patent: 4959624 (1990-09-01), Higgins, Jr. et al.
Grimm Siegfried H.
Squire William
U.S. Philips Corporation
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