US3962652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified surface acoustic wave synthesizer
Assignee: United States Department of the Army
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Filing: 1975-03-07
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Granted: 1976-06-08
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Expires: 1995-03-07
Abstract
Abstract A highly stable variable frequency oscillator is disclosed which employs aultitap surface acoustic wave device as a frequency standard. A feedback path which includes a voltage controlled switch for selecting a desired output tap drives a differential amplifier, phase detector, low pass filter, voltage controlled oscillator and phase splitter for driving the input tap of the surface acoustic wave device. Various additional feedback paths are also employed. The variable frequency signal is taken from the output of the voltage controlled oscillator.
Inventors
- 👤 Alvin Zarin
- 👤 Francis A. Carbin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:41
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A variable frequency oscillator including: a surface acoustic wave device having an input transducer and at least first and second spaced output transducers; an amplifier having a first input terminal and an output terminal; first means for connecting said output terminal of said amplifier to said input terminal of said transducer; and second means for selectively connecting said first and second spaced output transducers to said first input terminal of said amplifier.
Claim 2
Dependent Claim
72 words
A variable frequency oscillator including: a surface acoustic wave device having an input transducer and at least first and second spaced output transducers; an amplifier having a first input terminal and an output terminal; first means for connecting said output terminal of said amplifier to said input terminal of said transducer; and second means for selectively connecting said first and second spaced output transducers to said first input terminal of said amplifier.
Claim 3
Dependent Claim
151 words
The variable frequency oscillator as defined in claim 1 in which said input transducer is a differential transducer having first and second input transducer terminals and said amplifier is a differential amplifier also having a second input terminal; said first means including; a phase detector having first and second input ports and an output port; third means for connecting said output of said amplifier to said first input port; fourth means for connecting said first input transducer terminal to said second input port; a voltage controlled oscillator for providing an A. C. signal at the output thereof; fifth means for connecting said output port to drive said voltage controlled oscillator; and sixth means for impressing said A. C. signal across said first and second input transducer terminals; said variable frequency oscillator also including: seventh means for connecting said second input transducer terminal to said second input terminal of said differential amplifier.
Claim 4
Dependent Claim
19 words
The variable frequency oscillator as defined in claim 2 in which said fifth means include a low pass filter.
Claim 5
Dependent Claim
19 words
The variable frequency oscillator as defined in claim 3 in which said sixth means includes a phase splitting device.
Claim 6
Dependent Claim
39 words
The variable frequency oscillator as defined in claim 1 in which said second means is responsive to a signal applied thereto for selectively connecting said first and second spaced output transducers to said first input terminals of said amplifier.
Claim 7
Dependent Claim
151 words
The variable frequency oscillator as defined in claim 5 in which said input transducer is a differential transducer having first and second input transducer terminals and said amplifier is a differential amplifier also having a second input terminal; said first means including; a phase detector having first and second input ports and an output port; third means for connecting said output of said amplifier to said first input port; fourth means for connecting said first input transducer terminal to said second input port; a voltage controlled oscillator for providing an A. C. signal at the output thereof; fifth means for connecting said output port to drive said voltage controlled oscillator; and sixth means for impressing said A. C. signal across said first and second input transducer terminals; said variable frequency oscillator also including: seventh means for connecting said second input transducer terminal to said second input terminal of said differential amplifier.
Claim 8
Dependent Claim
19 words
The variable frequency oscillator as defined in claim 6 in which said fifth means includes a low pass filter.
Claim 9
Dependent Claim
19 words
The variable frequency oscillator as defined in claim 7 in which said sixth means includes a phase splitting device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |