Patent ID: 7336134

Claim:
A digitally controlled oscillator comprising: a first controllable component controlling a first parameter affecting an output frequency of the digitally controlled oscillator, wherein: said first controllable component comprises a bank of capacitors; said first parameter comprises capacitance; and said first controllable component is adapted to be controlled by a first digital word to effectuate coarse tuning of the digitally controlled oscillator; a current digital to analog converter (CDAC) controlling a second parameter affecting the output frequency of the digitally controlled oscillator, wherein said CDAC is adapted to be controlled by a second digital word to effectuate fine tuning of the digitally controlled oscillator and the second parameter includes a variable bias current provided to the first controllable component; and a third controllable component controlling a third parameter affecting the output frequency of the digitally controlled oscillator, wherein: said third controllable component comprises a bank of varactors; said third parameter comprises capacitance; and said third controllable component is adapted to be controlled by a third digital word to effectuate an intermediate level of tuning of the digitally controlled oscillator.