US3694665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wired or circuit
Assignee: Lockheed Martin Corp
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Filing: 1970-11-05
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Granted: 1972-09-26
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Expires: 1990-11-05
Abstract
Abstract WIRED OR circuit arrangement in which a transmission line is used as the OR''ING media. The transmission line is driven from a source of substantially constant current having a source impedance which is substantially equal to the characteristic impedance of the line. Changes in line current are sensed by a current sensing device which also maintains a constant voltage between the line and circuit ground.
Inventors
- 👤 Robert A Belluche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:27
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/173
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A wired OR circuit comprising a plurality of gating elements each including an output signal lead having first and second voltage conditions when the corresponding gating element is turned on and off, respectively; a transmission line; a current source for applying a substantially constant current to one end of said line; means for coupling said gating element output signal leads to different points along said line such that when any one of said gating elements is turned on a portion of the constant current is diverted from the line thereby resulting in a dip in current value at the other end of the line; and current sensing means coupled to the other end of said line and responsive to said dips in current value to provide an output signal having a first value when at least one of said gating elements is turned on and a second value when all of said gating elements are turned off.
Claim 2
Dependent Claim
157 words
A wired OR circuit comprising a plurality of gating elements each including an output signal lead having first and second voltage conditions when the corresponding gating element is turned on and off, respectively; a transmission line; a current source for applying a substantially constant current to one end of said line; means for coupling said gating element output signal leads to different points along said line such that when any one of said gating elements is turned on a portion of the constant current is diverted from the line thereby resulting in a dip in current value at the other end of the line; and current sensing means coupled to the other end of said line and responsive to said dips in current value to provide an output signal having a first value when at least one of said gating elements is turned on and a second value when all of said gating elements are turned off.
Claim 3
Dependent Claim
18 words
The invention according to claim 1 wherein said line is terminated at each end in its characteristic impedance.
Claim 4
Dependent Claim
30 words
The invention according to claim 2 wherein said current sensing means includes means for maintaining a constant voltage between said other end of the line and a circuit reference potential.
Claim 5
Dependent Claim
57 words
The invention according to claim 3 wherein said current sensing means includes a transistor connected in the common base configuration with its emitter coupled to said line, and its collector coupled to an output buffer which produces said output signal; wherein said constant voltage means includes a Zener diode network coupled to the base of said transistor.
Claim 6
Dependent Claim
51 words
The invention as set forth in claim 3 wherein said coupling means includes a like plurality of series circuits, different ones of which couple the signal leads of different ones of the gating elements to said different points; and wherein each of said series circuits includes a diode and a resistor.
Claim 7
Dependent Claim
29 words
The invention as set forth in claim 5 wherein each of said diodes is poled so as to be reverse biased when its associated gating element is turned off.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |