Crystal oscillator with adjustable capacitive assembly...

Details Crystal oscillator with adjustable capacitive assembly... Crystal oscillator with adjustable capacitive assembly...

2005-03-01

2005-03-01

Nguyen, Minh (Department: 2816)

Oscillators

Electromechanical resonator

Crystal

C331S17700V

Reexamination Certificate

active

06861915

ABSTRACT:
A crystal oscillator has a quartz-crystal unit, a first oscillating capacitor connected between a first end of the crystal unit and a reference potential point, a second oscillating capacitor connected between a second end of the crystal unit and the reference potential point, a CMOS inverter connected parallel to the crystal unit, and a feedback resistor connected across the inverter. The crystal oscillator can easily be incorporated into integrated circuits and has an increased variable oscillation frequency range. The crystal oscillator also has an adjustable capacitive assembly having selectable capacitances which is connected parallel to a combined capacitor comprising the first and the second oscillating capacitors.

REFERENCES:
patent: 5030926 (1991-07-01), Walden
patent: 5150081 (1992-09-01), Goldberg
patent: 5428319 (1995-06-01), Marvin et al.
patent: 5511126 (1996-04-01), Westwick
patent: 5844448 (1998-12-01), Jackoski et al.
patent: 20010052826 (2001-12-01), Kubo et al.

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