US3868595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rf oscillator frequency control utilizing surface wave delay lines
Assignee: Texas Instruments Inc
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Filing: 1972-10-30
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Granted: 1975-02-25
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Expires: 1992-10-30
Abstract
Abstract A surface wave oscillator having a surface wave delay line device in its oscillator circuit is taught. The surface wave delay line device is used in the oscillator to fix the frequency of oscillation and to establish a phase slope which provides optimum frequency stability for the desired frequency modulation bandwidth.
Inventors
- 👤 Jr Wallace A Capps
- 👤 Iii Lemuel D Groom
- 👤 Clinton S Hartmann
- 👤 Jr Howard G Vollers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/326
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
174 words
A phase shift oscillator including an amplifier having a phase shift network connected between its output and input ports, wherein the phase shift network is a surface wave delay line having an input transducer and an output transducer, said input and output transducers having a selected number of cycles at operating frequency and whose centers are selectively separated, said selected number of cycles at the operating frequency and separation of the input and output transducers operative to set the amplitude response and the phase response of said surface wave delay line at the peak frequency of the delay line amplitude response and appproximately equal to the frequency of zero phase shift around the oscillator loop, and wherein the selected number of cycles at the operating frequency and the separation of the input and output transducers are arranged to center the zero phase shift of the surface wave device phase line at approximately the maximum operating curve at the center of the resonance curve, and to permit a narrow resonance curve to prevent frequency hopping.
Claim 2
Dependent Claim
174 words
A phase shift oscillator including an amplifier having a phase shift network connected between its output and input ports, wherein the phase shift network is a surface wave delay line having an input transducer and an output transducer, said input and output transducers having a selected number of cycles at operating frequency and whose centers are selectively separated, said selected number of cycles at the operating frequency and separation of the input and output transducers operative to set the amplitude response and the phase response of said surface wave delay line at the peak frequency of the delay line amplitude response and appproximately equal to the frequency of zero phase shift around the oscillator loop, and wherein the selected number of cycles at the operating frequency and the separation of the input and output transducers are arranged to center the zero phase shift of the surface wave device phase line at approximately the maximum operating curve at the center of the resonance curve, and to permit a narrow resonance curve to prevent frequency hopping.
Claim 3
Dependent Claim
183 words
A pHase shift oscillator including an amplifier having a phase shift network connected between its ouput and input ports wherein the phase shift network is a surface wave delay line having an input transducer and an output transducer, said input and output transducers having a selected number of cycles at operating frequency and whose centers are selectively separated, said selected number of cycles at the operating frequency and separation of the input and output transducers operative to set the amplitude response and the phase response of said surface wave delay line at the peak frequency of the delay line amplitude response and approximately equal to the frequency of zero phase shift around the oscillator loop; and a frequency modulating network coupled to the oscillator and wherein the selected number of cycles at the operating frequency and the separation of the input and output transducers are operative to center the zero phase shift of the surface wave device phase line at approximately the maximum operating curve at the center of the resonance curve to permit optimum frequency modulation of the oscillator without frequency hopping.
Claim 4
Dependent Claim
183 words
A pHase shift oscillator including an amplifier having a phase shift network connected between its ouput and input ports wherein the phase shift network is a surface wave delay line having an input transducer and an output transducer, said input and output transducers having a selected number of cycles at operating frequency and whose centers are selectively separated, said selected number of cycles at the operating frequency and separation of the input and output transducers operative to set the amplitude response and the phase response of said surface wave delay line at the peak frequency of the delay line amplitude response and approximately equal to the frequency of zero phase shift around the oscillator loop; and a frequency modulating network coupled to the oscillator and wherein the selected number of cycles at the operating frequency and the separation of the input and output transducers are operative to center the zero phase shift of the surface wave device phase line at approximately the maximum operating curve at the center of the resonance curve to permit optimum frequency modulation of the oscillator without frequency hopping.
Claim 5
Dependent Claim
41 words
A surface wave oscillator according to claim 2, further comprising an impedance matching network operatively coupled between the amplifier and the surface wave delay line device for matching the amplifier impedance into the input of the surface wave delay line device.
Claim 6
Dependent Claim
42 words
A surface wave oscillator according to claim 3, further including an impedance matching network coupled between the output of the surface wave delay line device and the amplifier input for matching the surface wave delay line device impedance into the amplifier input.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |