Voltage-controlled oscillator using current feedback network
US7170355B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2004 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Dec 11, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1243
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Provided is a voltage-controlled oscillator (VCO) using a current feedback network for use in a wireless communication terminal. The voltage-controlled oscillator has high input impedance and low output impedance, so that a degree of isolation from the external load is excellent, thereby preventing degradation of the Q-factor by the load in overall oscillation circuit. In the voltage-controlled oscillator of the present invention, an LC resonator is provided to generate positive feedback, and negative resistance may be obtained at a wider frequency range by tuning a varactor of the LC resonator. And a boosting inductor is inserted into the positive feedback loop to have a greater negative resistance, therefore it is possible to prevent a problem in which the oscillation does not occur due to the parasitic resistance components generated during circuit fabrication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.