Method and apparatus for phase shifting a controlled oscillator and applications thereof
US6194971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1997 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Apr 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B27/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for providing very small changes in the output oscillation of a controlled oscillation circuit, which may be used in a phase locked loop circuit, is accomplished by a phase-shifting controlled oscillator that includes an oscillation circuit and a selection circuit. The oscillation circuit generates a plurality of oscillations that are of approximately the same frequency and are approximately equally phase shifted from one another. The selection circuit is operably coupled to receive the plurality of oscillations and selects one of them to be the output oscillation based on a control signal. The very small change in the output oscillation occurs when the selection circuit, based on the control signal, selects another one of the oscillations to be the output oscillation. When the change happens, a single pulse is stretched by the phase difference between the "old" output oscillation and the "new" output oscillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.