Fast startup resonant element oscillator
US7482888B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 2007 |
| Grant date | Jan 27, 2009 |
| Priority date | — |
| Expiry date | Oct 2, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/36
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A startup circuit 200 and method 700 is provided for quickly starting up a resonator based oscillator. Tunable oscillator 201 provides an impetus signal to oscillator 205 through capacitor 202. The impetus signal has a frequency that is an estimate of the resonant frequency of resonator 205. The circuit measures the frequency of oscillator 204 and the frequency of tunable oscillator 201. The circuit then adjusts the frequency of tunable oscillator 201 such that the frequency of the tunable oscillator is substantially equal to the resonant frequency of the resonator 205 and stores a data state necessary for the tunable oscillator 201 to generate a signal with this target frequency in the future. During an ensuing startup cycle the stored data state causes the impetus signal delivered by tunable oscillator 202 to be substantially equal to the target frequency of oscillator 204 which improves startup performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.