US4170761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remotely powered intermediate amplifier for communications transmission
Assignee: Siemens AG
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Filing: 1978-03-08
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Granted: 1979-10-09
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Expires: 1998-03-08
Abstract
Abstract A remotely powered intermediate amplifier for communications transmission incorporates two sectional amplifiers and a filter circuit interconnecting the output of the first sectional amplifier with the input of the second sectional amplifier.
Inventors
- 👤 Frithjof Koppehele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:44
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/44; H04B3/36
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
208 words
In a remotely powered intermediate amplifier for communications transmission having an input terminal, an output terminal and a terminal common to input and output, said terminals being adapted for connection with a transmission line, said amplifier being remotely powered with electrical power over said transmission line, the combination comprising first and second sectional amplifiers, means connecting said input terminal to the input of said first sectional amplifier, means connecting said output terminal to the output of said second sectional amplifier, means for connecting each of said sectional amplifiers to a source of electrical power through said input and output terminals, means for decoupling the electrical power connections of said sectional amplifiers from each other for AC signals, a first capacitor connected between said common terminal and an AC reference potential of said first sectional amplifier, a second capacitor connected between said common terminal and an AC reference potential of said second sectional amplifier, and a filter circuit interconnecting the output of said first sectional amplifier and the input of said second sectional amplifier, said filter circuit having at least three ports, first and second ones of said ports being connected to said first and second sectional amplifiers and at least one further port connected to said common terminal.
Claim 2
Dependent Claim
208 words
In a remotely powered intermediate amplifier for communications transmission having an input terminal, an output terminal and a terminal common to input and output, said terminals being adapted for connection with a transmission line, said amplifier being remotely powered with electrical power over said transmission line, the combination comprising first and second sectional amplifiers, means connecting said input terminal to the input of said first sectional amplifier, means connecting said output terminal to the output of said second sectional amplifier, means for connecting each of said sectional amplifiers to a source of electrical power through said input and output terminals, means for decoupling the electrical power connections of said sectional amplifiers from each other for AC signals, a first capacitor connected between said common terminal and an AC reference potential of said first sectional amplifier, a second capacitor connected between said common terminal and an AC reference potential of said second sectional amplifier, and a filter circuit interconnecting the output of said first sectional amplifier and the input of said second sectional amplifier, said filter circuit having at least three ports, first and second ones of said ports being connected to said first and second sectional amplifiers and at least one further port connected to said common terminal.
Claim 3
Dependent Claim
36 words
The intermediate amplifier according to claim 1, wherein said filter circuit is constructed as a four-port circuit, with said third and fourth ports interconnecting said common terminal with said AC reference potential of said sectional amplifiers.
Claim 4
Dependent Claim
38 words
The intermediate amplifier according to claim 2, wherein said filter circuit contains a transformer arranged between said first and second ports, one terminal of each of said first and second ports being connected to said AC reference potential.
Claim 5
Dependent Claim
54 words
The intermediate amplifier according to claim 3, wherein said transformer has its primary winding connected to the first port and its secondary winding connected to the second port, the terminals of said first and second ports which are connected to said AC reference potential being connected, each by an impedance, to said common terminal.
Claim 6
Dependent Claim
36 words
The intermediate amplifier according to claim 3, wherein said transformer contains two windings by which said first and second ports are electrically connected together, one of the two windings being capacitively connected to said common terminal.
Claim 7
Dependent Claim
22 words
The intermediate amplifier according to claim 5, including an impedance for connecting one end of said one winding to said common terminal.
Claim 8
Dependent Claim
22 words
The intermediate amplifier according to claim 5, including an impedance for connecting a tap of said one winding to said common terminal.
Claim 9
Dependent Claim
31 words
The intermediate amplifier according to claim 5, including a shield for said transformer, said shield being coupled capacitively to said one winding, and means connecting said shield to said common terminal.
Claim 10
Dependent Claim
30 words
The intermediate amplifier according to claim 4, wherein said transformer is provided with a shield situated between the windings, and a capacitor for connecting said shield to said common terminal.
Claim 11
Dependent Claim
13 words
The intermediate amplifier according to claim 6, wherein said impedance is a capacitor.
Claim 12
Dependent Claim
13 words
The intermediate amplifier according to claim 7, wherein said impedance is a capacitor.
Claim 13
Dependent Claim
19 words
The intermediate amplifier according to claim 8, wherein said shield is connected to said common terminal by a capacitor.
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |