US4445222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling circuit for transferring data signals at a high rate
Assignee: Christian Rovsing AS
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Filing: 1979-10-26
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Granted: 1984-04-24
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Expires: 1999-10-26
Abstract
Abstract A coupling circuit for transferring data from a data transmitter to a bus common to several transmitters, each data transmitter being galvanically separated from the bus. The coupling circuit has a signal separator and a switch connected in series between its input and an output connected to the bus. The switch is controlled solely by the data signals transferred from the data transmitter via the signal separator and a rectifier circuit.
Inventors
- 👤 Asbjorn Smitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:23
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/4013; G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4072; H04L12/40006; H04L12/40039
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
199 words
A coupling circuit having a signal output for transferring a data signal at a high rate from a data transmitter to a bus common to several data transmitters, said circuit comprising separator means for galvanically separating said data transmitter from the bus and for providing said data signal via the signal output as an output signal, and switch means connected in series between the separator means and said signal output, and actuated and driven solely by the data signal from the data transmitter through the separator means, wherein said switch means comprises at least one switching transistor responsive to provision of said data signal by said data transmitter via said separator means for transferring said data signal via said signal output to said bus, and responsive to non-provision of said data signal by said data transmitter via said separator means for presenting a high impedance to said bus, said switch means further including a control circuit driven by said data signal via said separator means for controlling said at least one switching transistor to assume an on or an off state, whereby said data transmitter does not present a load to said bus when not providing said data signal.
Claim 2
Dependent Claim
199 words
A coupling circuit having a signal output for transferring a data signal at a high rate from a data transmitter to a bus common to several data transmitters, said circuit comprising separator means for galvanically separating said data transmitter from the bus and for providing said data signal via the signal output as an output signal, and switch means connected in series between the separator means and said signal output, and actuated and driven solely by the data signal from the data transmitter through the separator means, wherein said switch means comprises at least one switching transistor responsive to provision of said data signal by said data transmitter via said separator means for transferring said data signal via said signal output to said bus, and responsive to non-provision of said data signal by said data transmitter via said separator means for presenting a high impedance to said bus, said switch means further including a control circuit driven by said data signal via said separator means for controlling said at least one switching transistor to assume an on or an off state, whereby said data transmitter does not present a load to said bus when not providing said data signal.
Claim 3
Dependent Claim
72 words
A coupling circuit according to claim 1, wherein said at least one switching transistor comprises two transistor devices which, with mutually opposite forward directions, are positioned in series between said separator means and said signal output, and which each have a control electrode, said switch means further comprising two rectifier circuits, one for each transistor device, each disposed in parallel across the separator means and each galvanically separated from the data transmitter.
Claim 4
Dependent Claim
57 words
A coupling circuit according to claim 2, wherein said signal output comprises a pair of signal output lines, and each transistor device comprises a field effect transistor having a source-drain electrode connected in series with a respective one of the signal output lines, and having a control electrode connected to a respective one of said rectifier circuits.
Claim 5
Dependent Claim
47 words
A coupling circuit according to claim 2, wherein the separator means exhibits a high impedance state in an operative state, said coupling circuit further comprising a resistive load disposed in parallel across each rectifier circuit for preventing detrimental loading of said data transmitter unit from said bus.
Claim 6
Dependent Claim
25 words
A coupling circuit according to any one of claims 1, 2, 3 or 4, wherein the coupling circuit is integrated on a single semi-conductor substrate.
Claim 7
Dependent Claim
14 words
A coupling circuit according to claim 1, wherein said separator means comprises a transformer.
Claim 8
Dependent Claim
16 words
A coupling circuit according to claim 1, wherein said separator means comprises at least one capacitor.
Claim 9
Dependent Claim
50 words
A coupling circuit according to claim 1, wherein said separator means has two output terminals, and said at least one switching transistor comprises a source electrode connected to one of said two output terminals and a control electrode connected via a rectififer to the other of said two output terminals.
References Cited (Backward Citations)
US3465101A
Cited
FR1590158A
Cited
DE2101211A1
Cited
US3760198A
Cited
US3912948A
Cited
US3812292A
Cited
US3986046A
Cited
US3832575A
Cited
US4004102A
Cited
US4024501A
Cited
US4090035A
Cited
US4029971A
Cited
US4078159A
Cited
DE2702209A1
Cited
US4149030A
Cited
US4109117A
Cited
FR2443770A1
Cited
US4254501A
Cited
US4283695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |