Voltage-controlled oscillator and communication device
US6628174B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2001 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Nov 6, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1852
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An impedance transformer is so designed that the impedance and the reactance of a tuning part reach zero at a central control voltage. An open stub is employed for setting the characteristic impedance of a tuning stub to the minimum value when a variable reactance circuit is inductive while setting the characteristic impedance to −1.22 times the reactance of the variable reactance circuit when the variable reactance circuit is capacitive. A short stub is employed for setting the characteristic impedance of the tuning stub to 0.82 times the reactance of the variable reactance circuit when the variable reactance is inductive, while setting the characteristic impedance to the maximum when the variable reactance circuit is capacitive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.