US3889206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two and three-phase oscillators with all-pass network having amplitude responsive time constant
Assignee: Astrosystems Inc
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Filing: 1974-04-17
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Granted: 1975-06-10
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Expires: 1994-04-17
Abstract
Abstract Two-phase and three-phase electronic oscillators comprising an integrator coupled in a loop with an all-pass network. The input resistor of the integrator is an incandescent lamp filament having a positive temperature coefficient of resistance, which adjusts the time constant of the integrator as a function of the amplitude of the oscillator voltages, thereby enforcing the condition for oscillation. In the two-phase version, the input and output voltages of the integrator are precisely in quadrature, and have precisely the same amplitude. In the threephase version, an amplifier having a gain equal to square root 3 is interposed in the feedback path between the output and input of the oscillator to provide three voltages which are 120* out of phase and of precisely the same amplitude.
Inventors
- 👤 Arthur Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:14
CPC Classifications
H; H03; H03B; H03B27/00; H03B5/00; H03B5/20; H03B2200/00; H03B2200/006; H03B2200/0078; H03B2200/0092; H03B5/02; H03B5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
194 words
An electronic oscillator comprising: a. an integrator having input and output terminals, b. an all-pass network having an input terminal coupled to the output terminal of said integrator and an output terminal, said all-pass network comprising a voltage inverter having an input coupled to the input terminal of said all-pass network, a capacitor coupled between the output of said voltage inverter and the output terminal of sAid all-pass network, and a variable resistive means coupled between the input and output terminals of said all-pass network, said variable resistive means adjusting the time constant of said all-pass network as a function of the amplitude of an oscillating voltage generated by said oscillator, and c. an amplifier having a gain equal to square root 3 and input and output terminals, the input terminal of said amplifier being coupled to the output terminal of said all-pass network and the output terminal of said amplifier being coupled to the input terminal of said integrator; said oscillator generating voltages at the output terminal of said integrator, the output of said voltage inverter and the output terminal of said amplifier which ar precisely 120* out-of-phase and precisely matched in amplitude.
Claim 2
Dependent Claim
194 words
An electronic oscillator comprising: a. an integrator having input and output terminals, b. an all-pass network having an input terminal coupled to the output terminal of said integrator and an output terminal, said all-pass network comprising a voltage inverter having an input coupled to the input terminal of said all-pass network, a capacitor coupled between the output of said voltage inverter and the output terminal of sAid all-pass network, and a variable resistive means coupled between the input and output terminals of said all-pass network, said variable resistive means adjusting the time constant of said all-pass network as a function of the amplitude of an oscillating voltage generated by said oscillator, and c. an amplifier having a gain equal to square root 3 and input and output terminals, the input terminal of said amplifier being coupled to the output terminal of said all-pass network and the output terminal of said amplifier being coupled to the input terminal of said integrator; said oscillator generating voltages at the output terminal of said integrator, the output of said voltage inverter and the output terminal of said amplifier which ar precisely 120* out-of-phase and precisely matched in amplitude.
Claim 3
Dependent Claim
22 words
An electronic oscillator as defined by claim 1 wherein said resistive means comprises a resistor having a negative temperature coefficient of resistance.
Claim 4
Dependent Claim
70 words
An electronic oscillator as defined by claim 1 wherein said integrator comprises an amplifier having an output coupled to the output terminal of said integrator; a capacitor coupled between the input and output of said amplifier; and a resistive means coupled between the input terminal of said integrator and the input of said amplifier, said resistive means of said integrator determining the frequency of the voltages generated by said oscillator.
Claim 5
Dependent Claim
70 words
An electronic oscillator as defined by claim 2 wherein said integrator comprises an amplifier having an output coupled to the output terminal of said integrator; a capacitor coupled between the input and output of said amplifier; and a resistive means coupled between the input terminal of said integrator and the input of said amplifier, said resistive means of said integrator determining the frequency of the voltages generated by said oscillator.
References Cited (Backward Citations)
US3639859A
Cited
US3656066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |