Frequency synthesizer having VCO bias current compensation
US6838951B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 2003 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Jun 3, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/113
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides circuitry for maintaining the desired phase noise across the tuning range of a frequency synthesizer by compensating the voltage controlled oscillator (VCO) bias current according to various tuning parameters available within the frequency synthesizer, thereby reducing overall current drain and inductor quality factor requirements. In general, the present invention includes a VCO bias circuit capable of controlling the VCO bias current in response to a control signal provided by additional circuitry based on the operating frequency of the frequency synthesizer. Further, the VCO bias current changes in response to changing the operating frequency of the frequency synthesizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.