US5136187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated communications bus terminator
Assignee: International Business Machines Corp
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Filing: 1991-04-26
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Granted: 1992-08-04
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Expires: 2011-04-26
Abstract
Abstract A system and method of providing a temperature compensated line termination for a high speed communications bus meeting military standards specifications. A temperature compensating device exhibiting a negative temperature coefficient of resistance is connected between a power supply and the communications bus drives. In a preferred embodiment, a P-N junction in series with a Schottky diode is placed between a 3.3 volt supply and the communications bus drive modules.
Inventors
- 👤 John C. Ceccherelli
- 👤 Stephen R. Scandalis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/08; H03; H03K; H03K17/00; H03K17/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A line termination arrangement for a communications bus having a plurality of communication drive modules connected thereto comprising a negative temperature coefficient compensating resistance comprised of a resistor, a P-N diode and a Schottky diode serially connected between a power supply and the communication drive modules for providing proper line termination for the communication bus over a wide temperature range.
Claim 2
Dependent Claim
60 words
A line termination arrangement for a communications bus having a plurality of communication drive modules connected thereto comprising a negative temperature coefficient compensating resistance comprised of a resistor, a P-N diode and a Schottky diode serially connected between a power supply and the communication drive modules for providing proper line termination for the communication bus over a wide temperature range.
Claim 3
Dependent Claim
21 words
The line termination arrangement of claim 1 wherein temperature compensation is provided over a range of -55° C. to 125° C.
Claim 4
Dependent Claim
14 words
The line termination of claim 1 wherein the power supply is approximately 3.3 volts.
Claim 5
Dependent Claim
15 words
The line termination of claim 2 wherein the resistor has a value of 36 ohms.
Claim 6
Dependent Claim
42 words
A communications bus having a plurality of communication drive modules connected thereto comprising a negative temperature coefficient resistance compensated line termination comprising a resistor, a P-N diode and a Schottky diode serially connected between a power supply and the communication drive modules.
Claim 7
Dependent Claim
42 words
A communications bus having a plurality of communication drive modules connected thereto comprising a negative temperature coefficient resistance compensated line termination comprising a resistor, a P-N diode and a Schottky diode serially connected between a power supply and the communication drive modules.
Claim 8
Dependent Claim
15 words
The communication bus of claim 5 wherein the resistor has a value of 36 Ohms.
Claim 9
Dependent Claim
20 words
The communication bus of claim 5 wherein temperature compensation is provided over a range of -55° C. to 125° C.
Claim 10
Dependent Claim
53 words
A high speed communications bus having a plurality of communications drive modules connected thereto comprising a resistor, a P-N diode and a Schottky diode connected in series between a 3.3 bolt supply and the communications drive modules for providing temperature compensated termination resistance over a temperature range of -55° C. to 125° C.
Claim 11
Dependent Claim
53 words
A high speed communications bus having a plurality of communications drive modules connected thereto comprising a resistor, a P-N diode and a Schottky diode connected in series between a 3.3 bolt supply and the communications drive modules for providing temperature compensated termination resistance over a temperature range of -55° C. to 125° C.
References Cited (Backward Citations)
US3283259A
Cited
US3723759A
Cited
US3727072A
Cited
US3775706A
Cited
US3832575A
Cited
US4015147A
Cited
US4220876A
Cited
US4365214A
Cited
US4508981A
Cited
US4890271A
Cited
US4675551A
Cited
US4853560A
Cited
US4853560B1
Cited
JPS63316920A
Cited
US4943739A
Cited
US5019728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |