High resolution tuning over a wide frequency range
Abstract
Abstract A METHOD AND APPARATUS FOR ACCURATELY TUNING THE FREQUENCY OF A GENERATED SIGNAL BY COARSE TUNING THE OUTPUT OF A GENERATOR IN A FIRST STAGE AND PROVIDING A PLURALITY OF FURTHER TUNING STAGES EACH ARRANGED TO EFFECT A FINER TUNING THAN THE PRECEDING STAGE, EACH FURTHER STAGE BEING ARRANGED TO GENERATE A SIGNAL, TO MIX THAT SIGNAL WITH THE SIGNAL FROM THE PRECEDING STAGE TO PRODUCE AN OUTPUT WHOSE FREQUENCY IS EQUAL TO THE DIFFERENCE BETWEEN THE FREQUENCIES OF THE TWO MIXED SIGNALS, FREQUENCY DIVIDING THE DIFFERENCE SIGNAL BY MEANS OF A VARIABLE DIGITAL COUNTER WHICH IS CONTROLLED TO HAVE ANY ONE OF A PLURALITY OF FREQUENCY DIVISION RATIOS, COMPARING THE FREQUENCY OF THE COUNTER OUTPUT WITH A REFERENCE FREQUENCY DERIVED FROM A QUARTZ OSCILLATOR, PRODUCING A CONTROL SIGNAL WHICH IS PROPORTIONAL TO THE DIFFERENCE BETWEEN THE COMPARED FREQUENCIES, AND APPLYING THIS CONTROL SIGNAL TO THE GENERATOR OF THE ASSOCIATED STAGE TO BRING THE OUTPUT FREQUENCY OF THE GENERATOR TO A VALUE WHICH WILL CAUSE THE COUNTER OUTPUT FREQUENCY TO BE EQUAL TO THE REFERENCE FREQUENCY OF THE GENERATOR TO A VALUE WHICH WILL CAUSE THE THE GENERATOR OF THE LAST FURTHER STAGE.
Inventors
- 👤 Helmut Oberbeck
Bibliographic Details
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |