US3778642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative switching circuit
Assignee: Nortel Networks Technology Corp
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Filing: 1973-04-17
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Granted: 1973-12-11
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Expires: 1993-04-17
Abstract
Abstract A switching circuit for regenerating pulses in the repeater of a digital transmission system which utilizes an R-C compensating network to minimize base line wander resulting from low frequency cut-off in the input coupling network.
Inventors
- 👤 R Frame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:52
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/06; H04L25/061; H04L25/062; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286; H03K3/2893
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A regenerative switching circuit, including low frequency compensation for a high-pass input coupling network forming part thereof, comprising: first and second transistors having separate collector resistances and a common emitter resistance connected to opposed ends of a source of operating potential; the base of the first transistor connected to the input coupling network and the collector of the second transistor connected to the output of the regenerative circuit; a coupling resistance connected between the collector of the first transistor and the base of the second transistor; a biasing resistance connected between the base of the second transistor and a potential point intermediate that of the ends of said source; the improvement comprising: a compensating capacitance connected in shunt with said bias resistance, the time constant thereof being such as to substantially compensate for the low frequency roll-off of said high-pass input coupling network.
Claim 2
Dependent Claim
143 words
A regenerative switching circuit, including low frequency compensation for a high-pass input coupling network forming part thereof, comprising: first and second transistors having separate collector resistances and a common emitter resistance connected to opposed ends of a source of operating potential; the base of the first transistor connected to the input coupling network and the collector of the second transistor connected to the output of the regenerative circuit; a coupling resistance connected between the collector of the first transistor and the base of the second transistor; a biasing resistance connected between the base of the second transistor and a potential point intermediate that of the ends of said source; the improvement comprising: a compensating capacitance connected in shunt with said bias resistance, the time constant thereof being such as to substantially compensate for the low frequency roll-off of said high-pass input coupling network.
Claim 3
Dependent Claim
43 words
A regenerative switching circuit as defined in claim 1 in which the high-pass input coupling network comprises: a coupling capacitance connected in series with the base of said first resistance and an input resistance connected between said base and the intermediate potential point.
Claim 4
Dependent Claim
107 words
A regenerative switching circuit, for regenerating a pulse stream on a transmission line, comprising: a pair of emitter-coupled transistors having a common emitter resistance and separate collector resistances; a coupling resistance connected between the collector of one of said transistors and the base of the other; a high-pass input network for coupling the input of said circuit to the base of said one transistor; the improvement comprising: a biasing network including a bias resistance and capacitance connected in shunt with the base of the other transistor, the R-C time constant thereof being such as to substantially compensate for the low frequency roll-off of said high-pass input network.
Claim 5
Dependent Claim
107 words
A regenerative switching circuit, for regenerating a pulse stream on a transmission line, comprising: a pair of emitter-coupled transistors having a common emitter resistance and separate collector resistances; a coupling resistance connected between the collector of one of said transistors and the base of the other; a high-pass input network for coupling the input of said circuit to the base of said one transistor; the improvement comprising: a biasing network including a bias resistance and capacitance connected in shunt with the base of the other transistor, the R-C time constant thereof being such as to substantially compensate for the low frequency roll-off of said high-pass input network.
Claim 6
Dependent Claim
49 words
A regenerative switching circuit as defined in claim 3 in which the high-pass input network comprises: a series connected coupling capacitance and a shunt connected input resistance connected to the base of said one transistor, the R-C time constant thereof being substantially equal to that of said biasing network.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |