Patent US3639859A successfully refreshed from Google Patents.
US3639859A
Expired / Lapsed
US
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An oscillator having single parameter tuning means
Assignee: US Philips Corp
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Filing: 1969-08-28
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Granted: 1972-02-01
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Expires: 1989-08-28
Abstract
Abstract An oscillator having a first phase-shifting network, an inverting amplifier and a second phase-shifting network comprising two impedances; one of the impedances is externally adjustable and determines the frequency of the oscillator signal. A total phase shift of 180* is achieved by means of the first phase-shifting network which provides a phase shift of substantially 90* in a frequency independent manner and by the second phase-shifting network which provides an additional phase shift of substantially 90* in a frequency-dependent manner.
Inventors
- 👤 Wilhelmus Antonius Jos Zwlisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:17
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/24; H03B2200/00; H03B2200/006; H03B2200/0078; H03B2201/00; H03B2201/02; H03B27/00; Y; Y10; Y10S; Y10S148/00; Y10S148/103
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
An oscillator for generating a signal having frequencies tuned by means of a single variable impedance comprising in series circuit arrangement, a first network for phAse-shifting the oscillator signal substantially 90* independent of frequency, phase-inverting means connected to said first network for providing signals having 0* and 180* phase shifts, said phaseinverting means comprising a second phase-shifting network comprising impedances for phase-shifting the oscillator signal substantially an additional 90* depending on the frequency of said oscillator signal and the values of said impedances, one of said impedances being variable, one of said impedances having values proportional to frequencies of the oscillator signal, means to combine said impedances to produce said additional 90* phase shift, amplifier means in said series circuit, and means for feeding the output of said second phase-shifting network back to said first phase-shifting network to maintain said oscillator signal.
Claim 2
Dependent Claim
142 words
An oscillator for generating a signal having frequencies tuned by means of a single variable impedance comprising in series circuit arrangement, a first network for phAse-shifting the oscillator signal substantially 90* independent of frequency, phase-inverting means connected to said first network for providing signals having 0* and 180* phase shifts, said phaseinverting means comprising a second phase-shifting network comprising impedances for phase-shifting the oscillator signal substantially an additional 90* depending on the frequency of said oscillator signal and the values of said impedances, one of said impedances being variable, one of said impedances having values proportional to frequencies of the oscillator signal, means to combine said impedances to produce said additional 90* phase shift, amplifier means in said series circuit, and means for feeding the output of said second phase-shifting network back to said first phase-shifting network to maintain said oscillator signal.
Claim 3
Dependent Claim
67 words
An oscillator as claimed in claim 1 wherein said first phase-shifting network operates with said amplifier to form a Miller integrator, said phase inverting means comprises two equal resistors and an amplifier, the one resistor functioning as an input resistor to said amplifier, the other providing feedback means between the input and output of said amplifier, and said impedances comprise a series resistor and a parallel capacitor.
Claim 4
Dependent Claim
160 words
An oscillator as claimed in claim 1 wherein said first phase-shifting network operates with said amplifier to form a Miller integrator, said phase inverting means comprises a transistor having equal collector and emitter resistors, an in phase component of the oscillator signal being set up at one end of the resistor and an opposite phase component being set up from one end of the other resistor, and said impedances comprise resistive and reactive components in parallel. 4 An oscillator as claimed in claim 1 wherein said first phase-shifting network operates with said amplifier to form a Miller integrator, said phase-inverting means comprises two equal resistors and an operational amplifier, the one resistor functioning as an input resistor to said amplifier, the other providing feedback means between the input and output of said amplifier and said impedances comprise a series resistor and a parallel capacitor connected between the input to said inverting means and the common terminal of said operational amplifier.
Claim 5
Dependent Claim
20 words
An oscillator as claimed in claim 1 wherein said first phase-shifting network comprises a series resistor and a parallel capacitor.
Claim 6
Dependent Claim
32 words
An oscillator as claimed in claim 1 wherein said phase-inverting means comprise a transformer having a primary winding for receiving said oscillator signal, and a secondary winding provided with a center tap.
References Cited (Backward Citations)
US3146407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |