Phase and magnitude compensated tuning for suppression of vibration induced phase noise of crystal oscillator with varying vibration frequencies
US5786735A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1997 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Feb 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides an adaptive signal conditioning device for a CXO crystal oscillator comprising a means for sensing acceleration, a band filter and a means for magnitude and phase compensation, with the means for magnitude and phase compensation having and an analog circuit represented by a transfer function, H(s), which adjusts a tuning signal's magnitude and phase, according to specific vibration frequency ranges, and produces a vibration cancellation signal in the presence of varying vibration frequencies, matching the vibration cancellation signal's frequency response to the frequency response of unwanted vibration-induced phase noise. The desired magnitude and phase of the tuning signal are determined with an adjustable identification device that is vibrated. Also disclosed and claimed is an adaptive signal magnitude and phase compensated tuning method comprising a signal filtering step, a magnitude and phase compensation step and a vibration cancellation signal matching step, in order to match a vibration cancellation signal's frequency response to the frequency response of unwanted vibration-induced phase noise and to suppress vibration-induced phase noise. In …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.