US4745376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault tolerant oscillator circuit having redundant resonant elements
Assignee: Honeywell Inc
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Filing: 1987-02-06
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Granted: 1988-05-17
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Expires: 2007-02-06
Abstract
Abstract An oscillator having a multiplicity of resonant structures parallel coupled to form a fault tolerant resonator in the feedback circuit of the oscillator. This fault tolerant resonator permits the oscillator to operate in a near fault free manner after the failure of one or more of the resonant structures.
Inventors
- 👤 Robert J. Aleksa
- 👤 Carl L. Shore
- 👤 Richard Hobby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:15
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B2200/00; H03B2200/0002; H03B2200/0012
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
An oscillating apparatus comprising: an amplifier having an input port and an output port; and at least two resonant structures, each comprising a series circuit including a crystal coupled between first and second series capacitors, said resonant structures coupled to form a parallel circuit, said parallel circuit having a first terminal coupled to said input port and a second terminal coupled to said output port, whereby a signal at said output port oscillates in accordance with resonant characteristics of said parallel circuit.
Claim 2
Dependent Claim
82 words
An oscillating apparatus comprising: an amplifier having an input port and an output port; and at least two resonant structures, each comprising a series circuit including a crystal coupled between first and second series capacitors, said resonant structures coupled to form a parallel circuit, said parallel circuit having a first terminal coupled to said input port and a second terminal coupled to said output port, whereby a signal at said output port oscillates in accordance with resonant characteristics of said parallel circuit.
Claim 3
Dependent Claim
46 words
An oscillating apparatus in accordance with claim 1 further including; a parallel combination of a first resistor and a first capacitor coupled to said input port; a second resistor coupled between said output port and said second terminal; and a capacitor coupled to said second terminal.
Claim 4
Dependent Claim
36 words
An oscillating apparatus in accordance with claim 2 further including third and fourth resistors serially coupled between said input port and said output port with a node therebetween and a third capacitor coupled to said node.
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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |