Patent US5136187A successfully refreshed from Google Patents.
US5136187A
Expired / Lapsed
US
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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 14:45
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.
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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 |