US5120989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified clock distribution in electronic systems
Assignee: United States Department of the Army
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Filing: 1991-02-04
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Granted: 1992-06-09
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Expires: 2011-02-04
Abstract
Abstract Drive signals generated at a single location are utilized to derive localized clock signals at several locations. The drive signals are phase shifted and have identical frequencies, while the clock signals derived therefrom are some frequency multiple thereof.
Inventors
- 👤 Douglas C. Johnson
- 👤 Arnold Bard
- 👤 Patrick F. McHugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:01
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/15; H03K5/15013; H03K5/1506
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
In an electronic system having circuit modules which communicate through interconnects therebetween, with the operation of each circuit module requiring at least one clock signal, the improvement comprising: each circuit module includes means for combining externally applied, phase shifted drive signals of identical frequency to derive at least one clock signal therein having some frequency multiple of the drive signals.
Claim 2
Dependent Claim
60 words
In an electronic system having circuit modules which communicate through interconnects therebetween, with the operation of each circuit module requiring at least one clock signal, the improvement comprising: each circuit module includes means for combining externally applied, phase shifted drive signals of identical frequency to derive at least one clock signal therein having some frequency multiple of the drive signals.
Claim 3
Dependent Claim
24 words
The system of claim 1 wherein a clock signal for at least one module is derived at twice the frequency of the drive signals.
Claim 4
Dependent Claim
29 words
The system of claim 2 wherein the clock signal is derived at the output of an exclusive OR gate having the drive signals applied individually to the inputs thereof.
Claim 5
Dependent Claim
38 words
The system of claim 1 wherein the clock signals for at least one module are derived from the outputs of exclusive OR gates at twice the frequencies of drive signals which are applied individually to the inputs thereof.
Claim 6
Dependent Claim
66 words
In an electronic system having a plurality of circuit modules which communicate through interconnects therebetween, with the operation of each such circuit module requiring at least one clock signal, the improvement comprising: at least one circuit module includes means for combining externally applied, phase shifted drive signals of identical frequency to derive at least one clock signal therein having some frequency multiple of the drive signals.
Claim 7
Dependent Claim
66 words
In an electronic system having a plurality of circuit modules which communicate through interconnects therebetween, with the operation of each such circuit module requiring at least one clock signal, the improvement comprising: at least one circuit module includes means for combining externally applied, phase shifted drive signals of identical frequency to derive at least one clock signal therein having some frequency multiple of the drive signals.
Claim 8
Dependent Claim
24 words
The system of claim 5 wherein a clock signal for at least one module is derived at twice the frequency of the drive signals.
Claim 9
Dependent Claim
29 words
The system of claim 6 wherein the clock signal is derived at the output of an exclusive OR gate having the drive signals applied individually to the inputs thereof.
Claim 10
Dependent Claim
38 words
The system of claim 5 wherein the clock signals for at least one module are derived from the outputs of exclusive OR gates at twice the frequencies of drive signals which are applied individually to the inputs thereof.
References Cited (Backward Citations)
US4737721A
Cited
JPH0281513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |