Tracking filter
Abstract
Abstract SPURIOUS SIGNALS OTHER THAN A SELECTED SIGNAL IN THE OUTPUT OF A SYNTHESIZER ARE FILTERED OUT BY A TRACKING FILTER COMPRISING A PHASE DISCRIMINATOR. THE DISCRIMINATOR INCLUDES THE SERIES COMBINATION OF A FIRST POWER DIVIDER, A VOLTAGE TUNED BAND-PASS FILTER (VTF), AND A SECOND POWER DIVIDER. A LINEAR CONTROL VOLTAGE FROM THE SYNTHESIZER IS APPLIED TO THE VTF TO TUNE THE CENTER FREQUENCY OF THE PASSBAND OF THE LATTER TO BE APPROXIMATELY EQUAL TO THE FREQUENCY OF THE SELECTED SIGNAL IN THE SYNTHESIZER OUTPUT. THE SECOND OUTPUTS OF THE POWER DIVIDERS ARE COMBINED IN A PHASE DETECTOR TO PRODUCE AN ERROR VOLTAGE THAT IS APPLIED TO THE VTF TO TUNE THE CENTER FREQUENCY OF THE PASSBAND THEREOF TO BE EQUAL TO THE SELECTED FREQUENCY.
Inventors
- 👤 Edward Hirshfield
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |