Title:
PIEZOELECTRIC OSCILLATOR FOR ASYNCHRONOUS MODE OPERATION
Document Type and Number:
Japanese Patent JPS60220605
Kind Code:
A
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.
Inventors:
JIERAARU MAROTERU
PATORITSUKU RUNUU
PATORITSUKU RUNUU
Application Number:
JP6175485A
Publication Date:
November 05, 1985
Filing Date:
March 26, 1985
Export Citation:
Assignee:
CEPE
International Classes:
H03B5/32; H03B5/36; H03L1/02; (IPC1-7): H03B5/32
Attorney, Agent or Firm:
Yoshio Kawaguchi
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