Digital oscillator
US5198779A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B27/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital oscillator generates pairs of sampled sinusoidal signals having precisely established phase relationships, e.g., in near-perfect quadrature. The digital oscillator has first and second, interconnected multiplying-integrating modules. Each module has a multiplier for multiplying an input signal by a first coefficient, and a digital integrator for integrating the product over a period of time and thereby generating a different one of the sampled sinusoidal signals. Setting the multiplier coefficients appropriately controls the amplitudes of the generated sinusoidal signals. Likewise, the frequencies and phases of the sinusoidal signals are controlled in response to the values of the multiplier coefficients and to the period of integration. In a preferred embodiment, the first module has a delay-free-forward-path ("DFEP") integrator, and the second module uses a delay-forward-path ("DFP") integrator. In the DFFP integrator, the forward path from input to output within the integrator is substantially delay-free, and a device provides a delay in a feedback path between the integrator input and output. In a DFP integrator, on the other hand, a device provides a delay in the for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.