Patent ID: 7437391

Claim:
A numerically controlled oscillator producing an oscillator output signal, said oscillator comprising: a phase accumulator for receiving an input digital word and producing a digital output signal in relation to said input digital word; and a phase to amplitude converter that is operatively coupled to said phase accumulator to receive a first phase signal and a second phase signal, said digital output signal comprising a first set of bits corresponding to said first phase signal, a second set of bits corresponding to said second phase signal, and a third set of bits comprising at least the least significant bit of said digital output signal, said phase to amplitude converter calculating a sine value and a cosine value of each of said first and second phase signals, said phase to amplitude converter generating a summation of (i) a product of the sine value of said first phase signal and the cosine value of said second phase signal and (ii) a product of the sine value of said second phase signal and the cosine value of the first phase signal, wherein said phase to amplitude converter outputs said summation as an amplitude signal; wherein said third set of bits is not used in generating said oscillator output signal.