Coil-less overtone crystal oscillator

Details Coil-less overtone crystal oscillator Coil-less overtone crystal oscillator

2006-07-14

2008-08-12

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S135000, C331S1160FE, C331S1160FE

Reexamination Certificate

active

07411466

ABSTRACT:
An overtone crystal oscillator including a crystal, multiple amplifiers and an RC network. The crystal has a fundamental resonance frequency and at least one overtone resonance frequency. The amplifiers are coupled in series between terminals of the crystal and the RC network is coupled to the amplifiers. The amplifiers and the RC network are collectively configured to suppress oscillation of the crystal at the fundamental resonance frequency and to enable oscillation at an overtone resonance frequency of the crystal. The amplifiers and the RC network may be configured to cause a phase shift between the fundamental resonance frequency and the overtone resonance frequency. The overtone resonance frequency may be any odd harmonic of the fundamental frequency, such as a third overtone of the crystal. The overtone crystal oscillator may be integrated with CMOS processes and does not require an inductor to suppress the fundamental mode of oscillation.

REFERENCES:
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patent: 6556094 (2003-04-01), Hasegawa et al.
patent: 7002423 (2006-02-01), Drakhlis et al.
patent: 2005/0206463 (2005-09-01), Godambe et al.
patent: 0265631 (2002-08-01), None
patent: 2004054090 (2004-06-01), None

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