High-speed low-power implementation for multi-channel numerically controlled oscillator (NCO)
US6781473B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2002 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Sep 13, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/0342
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for generating sinusoidal signals in quadrature. A numerically controlled oscillator includes a phase accumulator configured to generate a periodic multi-bit signal at a given frequency; a first memory configured to store an octant of a 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 phase accumulator signal 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.