Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2006-02-28
2006-02-28
Chang, Joseph (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C331S176000
Reexamination Certificate
active
07005934
ABSTRACT:
The invention provides a temperature compensated crystal oscillator that can obtain a large variable range and that can obtain high temperature stability. This temperature compensation system employs a configuration comprising a oscillation circuit12including a crystal vibrator11having a piezoelectric element excited in a given frequency and an oscillation amplifier that excites the piezoelectric element by flowing a current to the piezoelectric element, a vibrator current control circuit13that controls the current of the crystal vibrator, a temperature compensation voltage generation circuit15that compensates for temperature characteristics of the crystal vibrator11, and an external variable capacitance diode17that changes the oscillation frequency of the oscillation circuit12using an external variable voltage controller16. The vibrator current control circuit13comprises a variable capacitance diode14that controls the vibrator current, and capacitors1to3.
REFERENCES:
patent: 5999062 (1999-12-01), Gilbert
patent: 2002/0050867 (2002-05-01), Kato et al.
patent: 2003/0155984 (2003-08-01), Kubo et al.
Chang Joseph
Koda & Androlia
Toyo Communication Equipment Co., Ltd.
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