Piezoelectric oscillator having filters to prevent unwanted mode

Details Piezoelectric oscillator having filters to prevent unwanted mode Piezoelectric oscillator having filters to prevent unwanted mode

1985-03-25

1986-07-15

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331162, H03B 536

Patent

active

046009000

ABSTRACT:
A piezoelectric oscillator of the Clapp type for operation in the overtone mode comprises a piezoelectric resonator having a C-mode resonance frequency at which the oscillator is designed to operate, the resonator being connected between the base of a transistor and ground. A capacitive voltage-dividing bridge is also connected between the base of the transistor and ground, the so-called midpoint of the bridge being connected to the emitter of the transistor. A quartz crystal and an inductance coil decoupled by a capacitor are placed between the emitter of the transistor and ground. The inductance coil and the capacitor form a high-pass filter for attenuating frequencies below the resonance frequency. The piezoelectric resonator is tuned to the mode B which is adjacent to the mode C in order to eliminate the unwanted mode B.

REFERENCES:
patent: 4484157 (1984-11-01), Helle et al.
Siemens Zeitschrift, vol. 49, No. 5, 1975, (Erlangen, DE), H. J. Forster: "Temperatur-Kompensierte Quarzoszillatoren fur den Frequenzbereich 2 bis 60 MHz", pp. 328-332.

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