Patent ID: 9496882
Filing Date: 2016-11-15
CPC Classification: H03B,H03K,H03L

Claim Text:
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.