Third overtone crystal oscillator

Details Third overtone crystal oscillator Third overtone crystal oscillator

2008-04-08

2010-12-14

Chang, Joseph (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S068000, C331S10800D, C331S1160FE

Reexamination Certificate

active

07852167

ABSTRACT:
A third overtone crystal oscillator has an oscillator IC and a crystal element accommodated in a container. The IC includes transistor grounded at its emitter, a first capacitor connected to the base of the transistor via a DC blocking capacitor and to the ground potential, and a second capacitor connected between the collector of the transistor and the ground potential. Both ends of the crystal element are connected to non-grounded ends of the first and second capacitors, respectively. A spiral inductor forming a parallel resonant circuit together with the first capacitor, is provided at the container, using a printing process, for example, being independent of the IC. The parallel resonant frequency of the parallel resonant circuit is set higher than the oscillation frequency at the fundamental wave of the crystal element, and lower than the oscillation frequency at the third overtone of the crystal element.

REFERENCES:
patent: 6977557 (2005-12-01), Frerking
patent: 2004/0085147 (2004-05-01), Harima et al.
patent: 2004/0155715 (2004-08-01), Nakamura et al.
patent: 2005/0212608 (2005-09-01), Kato
patent: 2005/0285691 (2005-12-01), Hosokawa et al.
Seiko NPC Corporation, “CF5036 Series 2.5V LVPECL OUtput Oscillator ICs,” pp. 1-10, Apr. 2004.
Seiko NPC Corporation, “CF5037 Series 2.5V LVDS Output Oscillator ICs,” pp. 1-10, Apr. 2004.

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