Patent ID: 8222962
Filing Date: 2012-07-17
Classification: H03B

Abstract:
1. A digitally controlled oscillator for generating an oscillating signal of an oscillation frequency at a first output node, the digitally controlled oscillator comprising: a first tunable capacitance comprising a plurality of non-equally weighted switchable capacitive elements, the first tunable capacitance being configured to be controlled by a first digital control word, wherein the first digital control word controls the first tunable capacitance with non-uniform steps corresponding to incremental changes in the first digital control word; and a network of one or more fixed value capacitances coupled to the first tunable capacitance, wherein the combination of the first tunable capacitance and the network of one or more fixed value capacitances comprises a second tunable capacitance, and wherein the second tunable capacitance has substantially uniform steps corresponding to the incremental changes in the first digital control word.