US5063357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable, reliable oscillator system using automatic oscillator substitution
Assignee: Motorola Solutions Inc
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Filing: 1990-08-03
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Granted: 1991-11-05
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Expires: 2010-08-03
Abstract
Abstract A high stability oscillator circuit 100 having an output 150 and a multiple of reference oscillators 102, 104, and 106 for enhanced stability and reliability is disclosed. The output signals of these oscillators 108, 110, and 112 are mixed and analyzed for determination of excessive frequency shift including component failure. Additionally a switch 148 decouples the shifted oscillator signal from the output of the circuit 150 and couples another one of the oscillators in its place.
Inventors
- 👤 William R. Williams
- 👤 Edgar H. Callaway, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:14
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/07
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
A high reliability and high stability oscillator circuit having an output, comprising: at least three oscillators each providing oscillator signals; at least three mixers each coupled to a pair of oscillators for mixing pairs of said oscillator signals to provide mixed signals; and detector means responsive to said mixed signals for detecting frequency shift in any one of the oscillators; switching means responsive to said detector means to provide one of said oscillator signals to the output of said oscillator circuit.
Claim 2
Dependent Claim
81 words
A high reliability and high stability oscillator circuit having an output, comprising: at least three oscillators each providing oscillator signals; at least three mixers each coupled to a pair of oscillators for mixing pairs of said oscillator signals to provide mixed signals; and detector means responsive to said mixed signals for detecting frequency shift in any one of the oscillators; switching means responsive to said detector means to provide one of said oscillator signals to the output of said oscillator circuit.
Claim 3
Dependent Claim
14 words
The high stability oscillator circuit of claim 1, wherein said oscillators are reference oscillators.
Claim 4
Dependent Claim
15 words
The high stability oscillator circuit of claim 1 wherein said oscillators are crystal reference oscillators.
Claim 5
Dependent Claim
57 words
A high reliability and high stability oscillator circuit having an output, comprising: a plurality of oscillators oriented mutually perpendicular and providing oscillator signals; mixing means for mixing pairs of said oscillator signals to provide mixed signals; and switching means responsive to said mixed signals to provide one of said oscillator signals to the output of said circuit.
Claim 6
Dependent Claim
57 words
A high reliability and high stability oscillator circuit having an output, comprising: a plurality of oscillators oriented mutually perpendicular and providing oscillator signals; mixing means for mixing pairs of said oscillator signals to provide mixed signals; and switching means responsive to said mixed signals to provide one of said oscillator signals to the output of said circuit.
Claim 7
Dependent Claim
93 words
A communication device, comprising: a transceiver circuit for receiving and transmitting radio frequency signals having: a high stability oscillator circuit having an output, including: at least three oscillators each providing oscillator signals; at least three mixers each coupled to a pair of oscillators for mixing pairs of said oscillator signals to provide mixed signals; and detector means responsive to said mixed signals for detecting frequency shift in any one of the oscillators; switching means responsive to said detector means to provide one of said oscillator signals to the output of said oscillator circuit.
Claim 8
Dependent Claim
93 words
A communication device, comprising: a transceiver circuit for receiving and transmitting radio frequency signals having: a high stability oscillator circuit having an output, including: at least three oscillators each providing oscillator signals; at least three mixers each coupled to a pair of oscillators for mixing pairs of said oscillator signals to provide mixed signals; and detector means responsive to said mixed signals for detecting frequency shift in any one of the oscillators; switching means responsive to said detector means to provide one of said oscillator signals to the output of said oscillator circuit.
Claim 9
Dependent Claim
12 words
The communication device of claim 5, wherein said oscillators are reference oscillators.
Claim 10
Dependent Claim
14 words
The communication device of claim 6, wherein said reference oscillators are crystal reference oscillators.
Claim 11
Dependent Claim
17 words
A communication device as defined in claim 5, wherein said plurality of oscillators are oriented mutually perpendicular.
Claim 12
Dependent Claim
20 words
A communication device as defined in claim 5, further including controller means for controlling the functions of said communication device.
Claim 13
Dependent Claim
18 words
The communication device of claim 9, wherein one of said oscillators comprises an oscillator for said controller means.
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) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |