Oscillators – Solid state active element oscillator – Transistors
Patent
1985-03-25
1986-10-07
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331162, 331176, H03B 536, H03L 102
Patent
active
046161945
ABSTRACT:
A piezoelectric oscillator operating in the aperiodic or overtone mode comprising a first piezoelectric resonator having a resonance frequency at which the oscillator is to operate. One side of the first resonator is connected to ground, and the other side is connected through a second piezoelectric resonator to the base of a transistor. The second resonator has in common with the first resonator a mode at the resonance frequency, but its intrinsic quality factor is between 30 and 1000 times smaller than that of the first resonator. A capacitive divider bridge having a middle point is connected between the base of the transistor and ground. A third piezoelectric resonator having in common with said first resonator a mode at said resonance frequency, but whose intrinsic quality factor is of the same order of size as that of the second resonator, is connected between said middle point and the emitter of said transistor. A temperature sensing circuit is coupled to the oscillator and provides a control signal to a Varicap diode connected in the base circuit of the transistor, to compensate for frequency drift due to changes in temperature.
REFERENCES:
patent: 3372348 (1968-03-01), Feit
patent: 4484157 (1984-11-01), Helle et al.
Marotel Gerard
Renoult Patrick
Compagnie d'Electronique et de Piezo-Electricite C.E.P.E.
Grimm Siegfried H.
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