US3691304A
Expired / Lapsed
US
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Multiplexer transmission line circuit
Assignee: D D I COMMUNICATIONS Inc
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Filing: 1971-06-30
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Granted: 1972-09-12
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Expires: 1991-06-30
Abstract
Abstract A transmission line circuit is disclosed for a multiplexer which has first and second transmission conductors on which a multiplexed signal of a pulsed message train is transmitted and received. The transmission line circuit limits the possible voltage across the transmission line by using a plurality of diodes. In one form a diode bridge is constructed and connected to two different voltages on a DC reference source so that should a voltage, for example, an extraneous noise voltage appear across the line, it will be conducted by the diode bridge so long as the voltage exceeds the voltage drop of the diodes and the voltage presented by the DC voltage source. In an alternative arrangement, breakdown diodes are connected across the transmission line and connected to a DC reference source such that if an extraneous voltage appears across the transmission line which exceeds the voltage drops of the connected breakdown diodes and any connected voltage of the DC reference source, then conduction will be effected through the breakdown diodes to limit the voltage. A multiplexer transmission line circuit has an equalizing function and incorporates first and second voltage dividers to establish first points on two voltage dividers to which inputs to two amplifiers are connected. Second points at a potential different from the first points are also provided on the two voltage dividers and these second points are at the same potential and are connected to the first and second transmission lines. This establishes a polarizing voltage on each amplifier and the signal voltage must first be of the correct polarity and of sufficient magnitude to nullify the polarizing voltage on a particular amplifier before that amplifier will change its state of conduction. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
Inventors
- 👤 Werner P E Huebner
- 👤 Robert G Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:18
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/047; H04J3/10; H04L; H04L25/00; H04L25/02; H04L25/08
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
157 words
A multiplexer transmission line circuit for first and second transmission lines each having voltage pulses thereon in a pulsed message train, said transmission line circuit, comprising in combination, first and second diode means, DC reference source means with at least a first reference terminal means, first means connecting said first diode means to said first and second transmission lines and to said reference terminal means to conduct current from said first transmission line to said second transmission line only upon the voltage thereacross exceeding the combined voltage drop of said diode means and the connected voltage from said reference source, and second means connecting said second diode means to said first and second transmission lines and to said reference terminal means to conduct current from said second transmission line to said first transmission line only upon the voltage thereacross exceeding the combined voltage drop of said second diode means and the connected voltage from said reference source.
Claim 2
Dependent Claim
157 words
A multiplexer transmission line circuit for first and second transmission lines each having voltage pulses thereon in a pulsed message train, said transmission line circuit, comprising in combination, first and second diode means, DC reference source means with at least a first reference terminal means, first means connecting said first diode means to said first and second transmission lines and to said reference terminal means to conduct current from said first transmission line to said second transmission line only upon the voltage thereacross exceeding the combined voltage drop of said diode means and the connected voltage from said reference source, and second means connecting said second diode means to said first and second transmission lines and to said reference terminal means to conduct current from said second transmission line to said first transmission line only upon the voltage thereacross exceeding the combined voltage drop of said second diode means and the connected voltage from said reference source.
Claim 3
Dependent Claim
37 words
A circuit as set forth in claim 1, wherein said reference source means includes said first reference terminal means as a zero reference voltage, and said voltage pulses are positive pulses relative to said zero reference voltage.
Claim 4
Dependent Claim
18 words
A circuit as set forth in claim 1, wherein said first diode means includes a pair of diodes.
Claim 5
Dependent Claim
27 words
A circuit as set forth in claim 3, wherein said pairs of diodes is connected for conduction in the same direction relative to said first transmission line.
Claim 6
Dependent Claim
27 words
A circuit as set forth in claim 3, wherein said pair of diodes is connected for conduction in opposite directions relative to said first reference terminal means.
Claim 7
Dependent Claim
25 words
A circuit as set forth in claim 1, wherein saiD first and second diode means are connected symmetrically relative to said first reference terminal means.
Claim 8
Dependent Claim
26 words
A circuit as set forth in claim 1, wherein said first connection means includes at least a portion of the voltage from said reference source means.
Claim 9
Dependent Claim
35 words
A circuit as set forth in claim 1, wherein said voltage pulses are positive pulses relative to a zero reference voltage, and said reference source includes said first reference terminal as a zero reference voltage.
Claim 10
Dependent Claim
26 words
A circuit as set forth in claim 1, wherein said first and second diode means are connected in a bridge circuit with said reference source means.
Claim 11
Dependent Claim
64 words
A circuit as set forth in claim 1, including second reference terminal means in said reference source means which is positive relative to said first reference terminal means, said voltage pulses being positive with respect to said first reference terminal means, and said first diode means including a pair of diodes with one each connected to said first and second reference terminal means, respectively.
Claim 12
Dependent Claim
31 words
A circuit as set forth in claim 10, wherein said second diode means includes a pair of diodes with one each connected to said first and second reference terminal means, respectively.
Claim 13
Dependent Claim
25 words
A circuit as set forth in claim 1, wherein said diode means includes a break-down diode having different voltage drops in opposite current conducting directions.
Claim 14
Dependent Claim
20 words
A circuit as set forth in claim 12, wherein said first diode means includes two break-down diodes connected in series.
Claim 15
Dependent Claim
24 words
A circuit as set forth in claim 12, wherein each of said first and second diode means includes two break-down diodes connected in series.
Claim 16
Dependent Claim
66 words
A circuit as set forth in claim 1, wherein said first diode means includes at least a first break-down diode connected between said first transmission line and said first reference terminal means, said first reference terminal means being a zero reference voltage, and said second diode means including at least a second break-down diode connected between said second transmission line and said first reference terminal means.
Claim 17
Dependent Claim
31 words
A circuit as set forth in claim 15, wherein said first and second break-down diodes are connected of a polarity for conduction in opposite directions relative to said first transmission line.
Claim 18
Dependent Claim
213 words
A multiplexer transmission line circuit for receiving a signal on first and second transmission conductors, said transmission line circuit comprising, in combination, first and second output amplifiers each having a conducting and a non-conducting state and each having first and second input terminals with one an inverting input and the other a non-inverting input, DC source means, first and second voltage dividers connected to said DC source means, first means to polarize said first amplifier including means connecting at least said first input thereof to a point on said first voltage divider, second means to polarize said second amplifier including means connecting at least said first input thereof to a point on said second voltage divider, and means connecting said first transmission conductor to a second point on said first voltage divider and connecting said second transmission conductor to a second point on said second voltage divider which point is at substantially the same DC potential as said second point on said first voltage divider such that a signal voltage on said transmission conductors must nullify said polarizing voltage on said first amplifier to have said first amplifier change its state of conduction and must nullify said polarizing voltage on said second amplifier to have said second amplifier change its state of conduction.
Claim 19
Dependent Claim
213 words
A multiplexer transmission line circuit for receiving a signal on first and second transmission conductors, said transmission line circuit comprising, in combination, first and second output amplifiers each having a conducting and a non-conducting state and each having first and second input terminals with one an inverting input and the other a non-inverting input, DC source means, first and second voltage dividers connected to said DC source means, first means to polarize said first amplifier including means connecting at least said first input thereof to a point on said first voltage divider, second means to polarize said second amplifier including means connecting at least said first input thereof to a point on said second voltage divider, and means connecting said first transmission conductor to a second point on said first voltage divider and connecting said second transmission conductor to a second point on said second voltage divider which point is at substantially the same DC potential as said second point on said first voltage divider such that a signal voltage on said transmission conductors must nullify said polarizing voltage on said first amplifier to have said first amplifier change its state of conduction and must nullify said polarizing voltage on said second amplifier to have said second amplifier change its state of conduction.
Claim 20
Dependent Claim
32 words
A multiplexer circuit as set forth in claim 17, wherein said first and second transmission conductors each have pulses thereon as a part of the pulsed message train of a multiplexed signal.
Claim 21
Dependent Claim
30 words
A multiplexer circuit as set forth in claim 17, wherein said output amplifiers are operAtional amplifiers each with an inverting input connected to said second point on said voltage dividers.
Claim 22
Dependent Claim
41 words
A multiplexer circuit as set forth in claim 17, including means connecting said first and second transmission conductors to said DC source means to maintain a definite relationship between the voltage on said voltage dividers and the voltage on said conductors.
Claim 23
Dependent Claim
31 words
A multiplexer circuit as set forth in claim 17, wherein said first and second output amplifiers have the second inputs thereof connected to one of said first and second voltage dividers.
Claim 24
Dependent Claim
26 words
A multiplexer circuit as set forth in claim 17, including an impedance connected between said first and second transmission conductors across which said signal is developed.
Claim 25
Dependent Claim
19 words
A multiplexer circuit as set forth in claim 17, wherein each of said voltage dividers includes a resistive network.
Claim 26
Dependent Claim
30 words
A multiplexer circuit as set forth in claim 23, wherein said resistive network includes a resistance connected between said first and second transmission conductors across which said signal is developed.
Claim 27
Dependent Claim
36 words
A multiplexer circuit as set forth in claim 24, wherein said resistance interconnects said first and second voltage dividers and has substantially no current flow therein in the absence of a signal on said transmission conductors.
Claim 28
Dependent Claim
34 words
A multiplexer circuit as set forth in claim 17, wherein said DC source means has positive and negative terminals, and said first and second voltage dividers are connected across said positive and negative terminals.
Claim 29
Dependent Claim
47 words
A multiplexer circuit as set forth in claim 26, wherein said DC source means has an intermediate terminal connected to ground for a zero reference potential, and break-down diode means connected between said second points on said first and second voltage dividers to said zero reference potential.
Claim 30
Dependent Claim
25 words
A multiplexer circuit as set forth in claim 17, wherein said first and second points on said first voltage divider lie intermediate the ends thereof.
Claim 31
Dependent Claim
63 words
A multiplexer circuit as set forth in claim 17, wherein said first voltage divider includes first, second, third and fourth resistors, said first input of said first amplifier being connected to the junction of said first and second resistors in said first voltage divider, and said second input of said second amplifier being connected to the junction of said third and fourth resistors.
Claim 32
Dependent Claim
58 words
A multiplexer circuit as set forth in claim 29, wherein aid second voltage divider includes fifth, sixth, seventh and eighth resistors, said first input of said second amplifier being connected to the junction of said fifth and sixth resistors, and said second input of said first amplifier being connected to the junction of said seventh and eighth resistors.
Claim 33
Dependent Claim
58 words
A multiplexer circuit as set forth in claim 17, wherein said first point on said first voltage divider is positive with respect to the said second point thereon, and said first input on said first amplifier being said inverting input to have said first amplifier polarized for non-conduction in the absence of a signal on said transmission conductors.
Claim 34
Dependent Claim
64 words
A multiplexer circuit as set forth in claim 17, wherein said polarizing voltage across said first and second inputs of said first amplifier is a small fraction of the voltage of said DC source means. 33. A multiplexer circuit as set forth in claim 17, wherein said second input of said first amplifier is connected to a third point on said second voltage divider.
Claim 35
Dependent Claim
46 words
A multiplexer circuit as set forth in claim 33, wherein said second input of said second amplifier is connected to a third point on said first voltage divider which point is at substantially the same DC potential as said third point on said second voltage divider.
Claim 36
Dependent Claim
31 words
A multiplexer circuit as set forth in claim 34, wherein said second point on said first voltage divider is at a potential intermediate that of said first and third points thereon.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |