DIGITALLY CONTROLLED OSCILLATOR
First Claim
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1. A digitally controlled oscillator (DCO), comprising:
- a first oscillator;
a second oscillator, being selectively enabled in response to a controlled signal; and
a switch, coupled between the first oscillator and the second oscillator, being selectively conducted in response to the controlled signal, so that an oscillator signal is provided by the first oscillator when the switch is not conducted, and provided by the first oscillator and the second oscillator when the switch is conducted,wherein the second oscillator includes a capacitive device arranged to adjust the resolution of an oscillator signal, and the capacitive device is selectively enabled in response to a second controlled signal.
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Abstract
In some embodiments, a digitally controlled oscillator includes a first oscillator a second oscillator and a switch. The second oscillator is selectively enabled in response to a controlled signal. The switch is coupled between the first oscillator and the second oscillator and is selectively conducted in response to the controlled signal, so that an oscillator signal is provided by the first oscillator when the switch is not conducted, and provided by the first oscillator and the second oscillator when the switch is conducted.
16 Citations
20 Claims
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1. A digitally controlled oscillator (DCO), comprising:
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a first oscillator; a second oscillator, being selectively enabled in response to a controlled signal; and a switch, coupled between the first oscillator and the second oscillator, being selectively conducted in response to the controlled signal, so that an oscillator signal is provided by the first oscillator when the switch is not conducted, and provided by the first oscillator and the second oscillator when the switch is conducted, wherein the second oscillator includes a capacitive device arranged to adjust the resolution of an oscillator signal, and the capacitive device is selectively enabled in response to a second controlled signal. - View Dependent Claims (2, 3, 4, 6)
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5. (canceled)
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7. A method, comprising:
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providing a digitally controlled oscillator (DCO), the DCO including a first oscillator, a second oscillator and a switch coupled between the first oscillator and the second oscillator, wherein the second oscillator comprises a capacitive device; selectively enabling the second oscillator in response to an enable signal; selectively conducting the switch in response to the enable signal; providing an oscillator signal by the first oscillator when the switch is not conducted; providing an oscillator signal by the first oscillator and the second oscillator when the switch is conducted; and adjusting the resolution of the oscillator signal by, in response to a second controlled signal, selectively enabling the capacitive device. - View Dependent Claims (8, 9, 10, 11)
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12. A method, comprising:
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providing a digitally controlled oscillator (DCO), the DCO including a first oscillator including a third capacitor, a second oscillator including a capacitive device and a switch coupled between the first oscillator and the second oscillator, and the DCO providing an oscillator signal having a first resolution; and adjusting the first resolution by selectively enabling a second oscillator in response to a controlled signal and by selectively conducting the switch in response to the controlled signal, wherein adjusting the first resolution further comprises; adjusting the first resolution by selectively connecting the third capacitor in parallel with the capacitive device in response to the conduction state of the switch; and selectively enabling the capacitive device in response to a second controlled signal. - View Dependent Claims (13, 14, 16, 18, 19, 20)
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15. (canceled)
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17. (canceled)
Specification