Patent ID: 8779867
Filing Date: 2014-07-15
Classification: H03B,H03J

Abstract:
1. A digital controlled oscillator, comprising: an oscillator circuit configured to receive a control word and configured to generate an oscillator clock signal at a frequency selected by the control word; a varactor array having a first array of varactor cells having incremental capacitance values starting from a base capacitance value, wherein the incremental capacitance values are sequential integer multiples of the base capacitance value, wherein each of the varactor cells of the first array include an identical number of capacitors, each capacitor having a capacitance of the base capacitance value and at least a portion of the varactor cells configured to have one or more of its capacitors unconnected as dummy capacitors; and a control circuit coupled to the oscillator circuit configured to control the varactor array according to the control word.