Method and apparatus for automatic center frequency tuning of tunable bandpass filters
US7039385B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 2003 |
| Grant date | May 2, 2006 |
| Priority date | — |
| Expiry date | Jul 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1036
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A radio has a tunable bandpass filter that is tuned by apparatus within the radio. A reference generator generates a reference signal for use in tuning the tunable bandpass filter. The tunable bandpass filter receives the reference signal and provides a filter output signal. A digital signal processing and control processor is connected to the tunable bandpass filter to receive the filter output signal. The digital signal processing and control processor has a phase comparison function that provides a phase error metric from the filter output signal. The digital signal processing and control processor tunes the tunable bandpass filter to provide a desired phase error metric signal thereby tuning the tunable bandpass filter to the desired center frequency. The digital signal processing and control processor stores tunable filter parameters for the desired center frequency. The tuning process may be repeated for several desired center frequencies of the tunable bandpass filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.