Multiple-VCO tuning
US6707342B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Apr 13, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S331/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tuning circuit for use in tuning multiple voltage-controlled oscillators (VCOs) of a phase-locked loop (PLL) is provided. A search algorithm is used to determine which VCO to use for a given frequency to be synthesized by the PLL. The tuning circuit provides a binary representation, associated with the frequency to synthesize, to the PLL. The PLL responds to this representation by attempting to synthesize the associated frequency. New binary representations are provided until an indication of a threshold frequency between multiple VCOs is determined. A record of the threshold frequency is stored. The binary representation of a frequency to be synthesized and the stored record of the threshold frequency are used to provide an indication of which VCO of the PLL to use to synthesize the desired frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.