Patent ID: 6781473
Filing Date: 2004-08-24
Classification: G06F

Abstract:
A numerically controlled oscillator (NCO) comprising:a phase accumulator configured to generate a periodic multi-bit signal at a given frequency, wherein: the periodic multi-bit signal includes a set of control bits and a set of address bits, the control bits include a set of three control bits, and binary combinations of the three control bits map to octants of a sinusoidal waveform; a first memory configured to store an octant of the sinusoidal waveform; a second memory configured to store a complementary octant of the sinusoidal waveform; and a control circuit, responsive to at least a portion of the set of control bits and coupled to the first and second memories, the control circuit configured to access the first and second memories in parallel and construct respective sine and cosine waves at the given frequency.