Systems and methods for providing an adjustable reference signal to RF circuitry
US7035607B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2003 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Oct 24, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2215/064
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Frequency modification circuitry may be employed as part of a crystal oscillator circuit to generate a reference signal with adjustable frequency. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally controlled crystal oscillator (“DCXO”) circuitry and a crystal. The frequency modification circuitry may adjust the frequency of the reference signal in response to one or more frequency control signals. In one example, the frequency modification circuitry may include variable capacitors such as one or more continuously variable and/or discretely variable capacitors for providing coarse and/or fine adjustment of the reference signal frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.