Crystal oscillator
First Claim
1. A crystal oscillator comprising:
- a 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; and
an adjustable capacitive assembly having selectable capacitances which is connected parallel to a combined capacitor comprising the first and second oscillating capacitors.
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Accused Products
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.
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Citations
12 Claims
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1. A crystal oscillator comprising:
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a 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; and
an adjustable capacitive assembly having selectable capacitances which is connected parallel to a combined capacitor comprising the first and second oscillating capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification