Phase shift control for voltage controlled oscillator
US6650194B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2000 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Oct 31, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit is disclosed which adjusts the phase of a signal within an LC sinusoidal or a ring or other capacitive oscillator. The circuit uses FETs as capacitors. The gates of the FETs are connected to the capacitive node of the oscillator. The variable voltage source changes the state of the FET from depleted to inverted mode or from inverted to depleted mode which in turn dramatically changes the capacitance of the FET. The change of state exists for only a few clock cycles, typically less than five cycles, so that only the capacitance within the oscillator is instantaneously affected which changes adds as incremental/decremental frequency to adjust only the phase of the oscillation frequency. In this fashion, the average oscillation frequency not affected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.