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US 9,000,852 B1Granted
Method and apparatus for starting up oscillation
AssigneeMarvell International Ltd.
InventorsDennis Sinitsky, Junshi Qiao, Pei Wang, Song Chen, Haiqing Zhang, Tao Shui
Life of this patent
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Abstract
Aspects of the disclosure provide a circuit. The circuit includes a signal amplifying circuit coupled with a crystal component of a natural frequency to form a crystal oscillator, and a signal generator circuit configured to generate a signal with an energy distribution about the natural frequency, and to provide the signal to the crystal oscillator to assist the crystal oscillator to begin oscillating.
Claims21
A circuit, comprising:
- a signal amplifying circuit coupled with a crystal component of a natural frequency to form a crystal oscillator;
- a signal generator circuit configured to generate a signal with an energy distribution about the natural frequency, and provide the signal to the crystal oscillator to assist the crystal oscillator to begin oscillating;
- a ring oscillator configured to feed back the signal via at least two or more inverters coupled in series to the ring oscillator, each inverter coupled with a group of capacitors, wherein a first capacitor in the group has a first capacitance which is greater than a second capacitance of a second capacitor in the group and wherein the first capacitor is physically adjacent to the second capacitor;
- and
- a noise generation control circuit configured to randomly generate control signals to switch on and off the capacitors to the ring oscillator.
2 more elements
A method, comprising:
- generating a signal with an energy distribution in a frequency range about a natural frequency of a crystal component;
- providing the signal to a crystal oscillator formed by the crystal component to assist the crystal oscillator to begin oscillating;
- feeding back the signal by a ring oscillator via at least two or more inverters coupled in series to the ring oscillator, each inverter coupled with a group of capacitors, wherein a first capacitor in the group has a first capacitance which is greater than a second capacitance of a second capacitor in the group and wherein the first capacitor is physically adjacent to the second capacitor;
- randomly generating control signals to switch on and off the capacitors to the ring oscillator by a noise generation control circuit.
1 more element
A system, comprising:
- a crystal component configured to have a natural frequency;
- a signal amplifying circuit coupled with the crystal component to form a crystal oscillator;
- a signal generator circuit configured to generate a signal with an energy distribution about the natural frequency, and provide the signal to the crystal oscillator to assist the crystal oscillator to begin oscillating;
- a ring oscillator configured to feed back the signal via at least two or more inverters coupled in series to the ring oscillator, each inverter coupled with a group of capacitors, wherein a first capacitor in the group has a first capacitance which is greater than a second capacitance of a second capacitor in the group and wherein the first capacitor is physically adjacent to the second capacitor;
- and
- a noise generation control circuit configured to randomly generate control signals to switch on and off the capacitors to the ring oscillator.
3 more elements
Dependencies are inferred from the claim text.