Method and apparatus for automatic tuning calibration of electrically tuned filters
US5822687A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1993 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Aug 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/16
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for automatic tuning calibration of electronically tuned filters which comprises a programmable frequency generator for producing a calibration frequency signal, a filter for filtering the calibration frequency signal, a detector for producing a detector voltage, a processor for programming the frequency generator to specific test frequencies and for producing a stepped filter tuning voltage and storing the detector voltage in response to the stepped filter tuning voltage, and a converter for digital-to-analog conversion of the stepped filter tuning voltage. Calibration frequency signal versus tuning voltage responses are stored for a number of calibration iterations within the usable range of the filter and the resulting table can be used to determine the correct tuning voltage for the filter when operating at any frequency within the usable filter range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.