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 the oscillator signal, and the capacitive device is, in response to a second controlled signal, selectively enabled when the switch is conducted and the second oscillator is enabled;
wherein the DCO provides the oscillator signal with a first resolution when the second oscillator is not enabled, the switch is not conducted and the capacitive device is not enabled;
the DCO provides the oscillator signal with a second resolution when the second oscillator is enabled, the switch is conducted and the capacitive device is enabled; and
the DCO provides the oscillator signal with a third resolution when the second oscillator is enabled, the switch is conducted and the capacitive device is not enabled.
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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.
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Citations
19 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 the oscillator signal, and the capacitive device is, in response to a second controlled signal, selectively enabled when the switch is conducted and the second oscillator is enabled; wherein the DCO provides the oscillator signal with a first resolution when the second oscillator is not enabled, the switch is not conducted and the capacitive device is not enabled;
the DCO provides the oscillator signal with a second resolution when the second oscillator is enabled, the switch is conducted and the capacitive device is enabled; and
the DCO provides the oscillator signal with a third resolution when the second oscillator is enabled, the switch is conducted and the capacitive device is not enabled. - View Dependent Claims (2, 3, 4, 5, 18)
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6. 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 selectively, in response to a second controlled signal, enabling the capacitive device when the switch is conducted and the second oscillator is enabled, and providing, by the DCO, the oscillator signal with a first resolution when the second oscillator is not enabled, the switch is not conducted and the capacitive device is not enabled;
providing, by the DCO, the oscillator signal with a second resolution when the second oscillator is enabled, the switch is conducted and the capacitive device is enabled; and
providing, by the DCO, the oscillator signal with a third resolution when the second oscillator is enabled, the switch is conducted and the capacitive device is not enabled. - View Dependent Claims (7, 8, 9, 10, 19)
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11. 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 the 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 when the switch is conducted and the second oscillator is enabled; adjusting the first resolution to a second resolution by enabling the second oscillator, connecting the third capacitor in parallel with the capacitive device and enabling the capacitive device; and adjusting the first resolution to a third resolution by enabling the second oscillator, and not enabling the capacitive device. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification