Patent US3849609A successfully refreshed from Google Patents.
US3849609A
Expired / Lapsed
US
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Hybrid circuit
Assignee: US Philips Corp
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Filing: 1973-05-07
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Granted: 1974-11-19
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Expires: 1993-05-07
Abstract
Abstract A hybrid circuit for coupling a two-way transmission path to a one-way transmission path and a one-way receiving path, comprising a first amplifier whose input is connected to the receiving path and whose output is connected to the two-way transmission path, a second amplifier whose input is connected to the two-way transmission path and whose output is connected to the transmission path and a third amplifier whose input is connected to the receiving path and whose output is connected to the transmission path, characterized in that the first, second and third amplifiers are current-controlled current amplifiers.
Inventors
- 👤 J Voorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:08
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/58; H04B1/586
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A hybrid circuit for coupling a two-way transmission path to a one-way transmission path and a one-way receiving path, of the type wherein a first amplifier has an input connected to the receiving path and an output connected to the two-way transmission path, a second amplifier has an input connected to the two-way transmission path and an output connected to the transmission path, and a third amplifier has an input connected to the receiving path and an output connected to the transmission path, the improvement wherein the first, second and third amplifiers are current-controlled current amplifiers, wherein a constant current source is connected to an input of at least one of the amplifiers, and wherein a constant current source is connected to at least one output of the amplifiers.
Claim 2
Dependent Claim
129 words
A hybrid circuit for coupling a two-way transmission path to a one-way transmission path and a one-way receiving path, of the type wherein a first amplifier has an input connected to the receiving path and an output connected to the two-way transmission path, a second amplifier has an input connected to the two-way transmission path and an output connected to the transmission path, and a third amplifier has an input connected to the receiving path and an output connected to the transmission path, the improvement wherein the first, second and third amplifiers are current-controlled current amplifiers, wherein a constant current source is connected to an input of at least one of the amplifiers, and wherein a constant current source is connected to at least one output of the amplifiers.
Claim 3
Dependent Claim
35 words
A hybrid circuit as claimed in claim 1, characterized in that the product of the current gain factors of the first and the second amplifier equals twice the current gain factor of the third amplifier.
Claim 4
Dependent Claim
105 words
A hybrid circuit as claimed in claim 1, characterized in that each of the current amplifiers has two parallel branches, of which one branch comprises a first transistor and the other branch comprises a second transistor, the base-emitter paths of the two transistors being connected in parallel, and the quotient of the emitter areas of the second and the first transistor of the first amplifier times the quotient of the emitter areas of the second and the first transistor of the second amplifier being substantially equal to twice the quotient of the emitter areas of the second and the first transistor of the third amplifier.
Claim 5
Dependent Claim
73 words
A hybrid circuit as claimed in claim 2, characterized in that the first branch also comprises a third and fourth transistor, the collector-base path of the third transistor being connected in anti-parallel with the collector-base path of the first transistor. the collector-emitter path of the fourth transistor being connectEd parallel to the emitter-base path of the third transistor, and the base of the third transistor constituting the input of the relevant current amplifier.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |