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US4434497A
Expired / Lapsed
US
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Response time bidirectional circuitry
Assignee: AT&T Inc
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Filing: 1981-12-22
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Granted: 1984-02-28
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Expires: 2001-12-22
Abstract
Abstract Bidirectional circuitry, which includes two amplifiers, each having a capacitor connected between an input and an output terminal thereof, and two interrupt transistors, acts to provide amplification and/or level shifting of information between two transceivers while also reducing capacitive loading and thus enhancing response time.
Inventors
- 👤 Robert M. Rolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:26
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/46; H03H11/48; H03H11/481
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
381 words
In combination: first and second amplifiers each having a first input terminal and an output terminal; first and second capacitance means each having first and second terminals; the first and second terminals of the first capacitance means being coupled to the first input terminal and to the output terminal of the first amplifier, respectively; the first and second terminals of the second capacitance means being coupled to the first input terminal and to the output terminal of the second amplifier, respectively; the first input terminal of each of the first and second amplifiers being adapted to be coupled to a transmitter, a receiver, or a transceiver; first and second switching devices each having a control terminal and first and second output terminals; a first electrical conduit (bus, data bus, conductor) having a capacitance associated therewith and being coupled by a first terminal thereof to the second output terminal of the first switching device and being coupled by a second terminal thereof to the first input terminal of the second amplifier; a second electrical conduit (bus, data bus, conductor) having a capacitance associated therewith and being coupled by a first terminal to the second output terminal of the second switching device and being coupled by a second terminal thereof to the first input terminal of the first amplifier; the output terminal of the first amplifier being coupled to the first output terminal of the first switching device; the output terminal of the second amplifier being coupled to the first output terminal of the first switching device; the gain of the first amplifier and the value of the first capacitance means being selected such that total load capacitance on the input terminal of the first amplifier is less than would be the case if the first capacitance means were not utilized; the gain of the second amplifier and the value of the second capacitance means being selected such that total load capacitance on the input terminal of the second amplifier is less than would be the case if the second capacitance means were not utilized; and the first and second switching devices being adapted to be coupled by the respective control terminals thereof to control means which selectively allows essentially only one of the switching means to be conductive at a given time.
Claim 2
Dependent Claim
381 words
In combination: first and second amplifiers each having a first input terminal and an output terminal; first and second capacitance means each having first and second terminals; the first and second terminals of the first capacitance means being coupled to the first input terminal and to the output terminal of the first amplifier, respectively; the first and second terminals of the second capacitance means being coupled to the first input terminal and to the output terminal of the second amplifier, respectively; the first input terminal of each of the first and second amplifiers being adapted to be coupled to a transmitter, a receiver, or a transceiver; first and second switching devices each having a control terminal and first and second output terminals; a first electrical conduit (bus, data bus, conductor) having a capacitance associated therewith and being coupled by a first terminal thereof to the second output terminal of the first switching device and being coupled by a second terminal thereof to the first input terminal of the second amplifier; a second electrical conduit (bus, data bus, conductor) having a capacitance associated therewith and being coupled by a first terminal to the second output terminal of the second switching device and being coupled by a second terminal thereof to the first input terminal of the first amplifier; the output terminal of the first amplifier being coupled to the first output terminal of the first switching device; the output terminal of the second amplifier being coupled to the first output terminal of the first switching device; the gain of the first amplifier and the value of the first capacitance means being selected such that total load capacitance on the input terminal of the first amplifier is less than would be the case if the first capacitance means were not utilized; the gain of the second amplifier and the value of the second capacitance means being selected such that total load capacitance on the input terminal of the second amplifier is less than would be the case if the second capacitance means were not utilized; and the first and second switching devices being adapted to be coupled by the respective control terminals thereof to control means which selectively allows essentially only one of the switching means to be conductive at a given time.
Claim 3
Dependent Claim
78 words
The combination of claim 1 wherein the gain of the first and second amplifiers is two or greater and the response time of the first amplifier is approximately two times or greater less than that of a desired response time of information transmitted through the second electrical conduit and the response time of the second amplifier is approximately two times or greater less than that of a desired response time of information transmitted through the first electrical conduit.
Claim 4
Dependent Claim
46 words
The combination of claim 2 wherein: the output terminals of the first and second amplifiers are non-inverting output terminals; the first input terminals of the first and second amplifiers are plus input terminals; and the first and second amplifiers each have a second minus input terminal.
Claim 5
Dependent Claim
370 words
A bidirectional communication system comprising: first and second transceivers; first and second amplifiers each having at least one input terminal and an output terminal; first and second capacitance means each having first and second terminals; first and second switching means each having a control terminal and first and second output terminals; the first transceiver being coupled to a first input terminal of the first amplifier, to the first terminal of the first capacitance means, to a second output terminal of the second switching means through a second electrical conduit, and to a first system terminal; the second terminal of the first capacitance means being coupled to the output terminal of the first amplifier, to the first output terminal of the first switching means, and to a second system terminal; the second transceiver being coupled to a first input terminal of the second amplifier, to the first terminal of the second capacitance means, to a second output terminal of the first switching means through a first electrical conduit, and to a third system terminal; the second terminal of the second capacitance means being coupled to the output terminal of the second amplifier, to the first output terminal of the second switching device, and to a fourth system terminal; the first and second switching means being adapted to be coupled by the respective control terminals thereof to control means which selectively allows essentially only one of the switching means to be conductive at a given time; the gain of the first amplifier and the value of the first capacitance means being selected such that total load capacitance on the input terminal of the first amplifier is less than would be the case if the first capacitance means were not utilized; the gain of the second amplifier and the value of the second capacitance means being selected such that total load capacitance on the input terminal of the second amplifier is less than would be the case if the second capacitance means were not utilized; and the first and second switching devices being adapted to be coupled by the respective control terminals thereof to control means which selectively allows essentially only one of the switching means to be conductive at a given time.
Claim 6
Dependent Claim
370 words
A bidirectional communication system comprising: first and second transceivers; first and second amplifiers each having at least one input terminal and an output terminal; first and second capacitance means each having first and second terminals; first and second switching means each having a control terminal and first and second output terminals; the first transceiver being coupled to a first input terminal of the first amplifier, to the first terminal of the first capacitance means, to a second output terminal of the second switching means through a second electrical conduit, and to a first system terminal; the second terminal of the first capacitance means being coupled to the output terminal of the first amplifier, to the first output terminal of the first switching means, and to a second system terminal; the second transceiver being coupled to a first input terminal of the second amplifier, to the first terminal of the second capacitance means, to a second output terminal of the first switching means through a first electrical conduit, and to a third system terminal; the second terminal of the second capacitance means being coupled to the output terminal of the second amplifier, to the first output terminal of the second switching device, and to a fourth system terminal; the first and second switching means being adapted to be coupled by the respective control terminals thereof to control means which selectively allows essentially only one of the switching means to be conductive at a given time; the gain of the first amplifier and the value of the first capacitance means being selected such that total load capacitance on the input terminal of the first amplifier is less than would be the case if the first capacitance means were not utilized; the gain of the second amplifier and the value of the second capacitance means being selected such that total load capacitance on the input terminal of the second amplifier is less than would be the case if the second capacitance means were not utilized; and the first and second switching devices being adapted to be coupled by the respective control terminals thereof to control means which selectively allows essentially only one of the switching means to be conductive at a given time.
Claim 7
Dependent Claim
76 words
The combination of claim 4 wherein the gain of the first and second amplifiers is two or greater and the response time of the first amplifier is approximately two times or greater less than that of a desired response time of information transmitted through the second conductor and the response time of the second amplifier is approximately two times or greater less than that of a desired response time of information transmitted through the first conductor.
Claim 8
Dependent Claim
46 words
The combination of claim 5 wherein: the output terminals of the first and second amplifiers are non-inverting output terminals; the first input terminals of the first and second amplifiers are plus input terminals; and the first and second amplifiers each have a second minus input terminal.
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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |