Voltage-controlled oscillator generating output signal finely tunable in wide frequency range and variable delay circuits included therein
US7521977B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 2007 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Jul 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00221
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage-controlled oscillator includes a plurality of variable delay circuits, wherein a first differential output signal of an adjacent previous stage is provided as a first differential input signal and a second differential output signal of a second previous stage is provided as a second differential input signal. Each variable delay circuit includes a loading circuit including first and second loading units, a first input circuit including first and second input transistors gated by the first differential input signal, a second input circuit including third and fourth input transistors gated by the second differential input signal, first and second current sources connected between a first common node and a second power source and in electrical parallel with each other, and third and fourth current sources connected between a second common node and the second power source and in electrical parallel with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.