US3593181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillator system
Assignee: International Standard Electric Corp
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Filing: 1969-11-05
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Granted: 1971-07-13
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Expires: 1989-11-05
Abstract
Abstract To minimize the noise of an oscillator whose frequency is controlled by a reference signal via a control loop, the output of the oscillator is applied to the two inputs of a phase demodulator via a high-Q tuned circuit and a 90* phase shifter respectively. In one embodiment the phase demodulator output is coupled via a high pass filter into the usual frequency controlling loop. In a second embodiment, the DC component in the control loop is coupled via a reactance stage into the high-Q tuned circuit.
Inventors
- 👤 Hans Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:23
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
An oscillator system comprising: an oscillator; a source of a reference frequency; means for comparing the output of said oscillator with said reference frequency to produce a DC control voltage; a phase demodulator having two inputs; a high-Q oscillator circuit coupled between said oscillator output and one of said inputs; a phase shifter coupled between said oscillator output and the other said inputs; and means for applying said DC voltage and the output of said phase demodulator to control said oscillator.
Claim 2
Dependent Claim
81 words
An oscillator system comprising: an oscillator; a source of a reference frequency; means for comparing the output of said oscillator with said reference frequency to produce a DC control voltage; a phase demodulator having two inputs; a high-Q oscillator circuit coupled between said oscillator output and one of said inputs; a phase shifter coupled between said oscillator output and the other said inputs; and means for applying said DC voltage and the output of said phase demodulator to control said oscillator.
Claim 3
Dependent Claim
52 words
An oscillator system according to claim 1 wherein said means for applying said DC voltage includes: a reactance stage controlling said oscillator; means for directly applying said DC voltage to said reactance stage; and means including a high pass filter for connecting the output of said phase demodulator to said reactance stage.
Claim 4
Dependent Claim
56 words
An oscillator system according to claim 1 wherein said means for applying includes: a first reactance stage for tuning said high-Q oscillator circuit; means for applying said DC voltage to said first reactance stage; a second reactance stage contolling said oscillator; and means for applying the output of said phase demodulator to said second reactance stage.
Claim 5
Dependent Claim
16 words
An oscillator system according to claim 1 wherein said phase shifter is a 90* phase shifter.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |