US3684975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative impedance amplifier
Assignee: Individual
•
Filing: 1970-07-10
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Granted: 1972-08-15
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Expires: 1990-07-10
Abstract
Abstract A negative impedance amplifier for a transmission line having two transformers and an amplifier. The size of the transformers is reduced and the resulting losses are compensated by increasing the gain of the amplifier. A negative feedback loop also reduces losses. A capacitor circuit is placed on the line connections to permit remote feeding. The transformers can be connected to the amplifier to provide for either series type or parallel type connection to the line.
Inventors
- 👤 Cesare Valfre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:53
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A negative impedance amplifier for a transmission line, including an equalizing and gain regulating network, and comprising two transformers each having primary and secondary windings, and an amplifier unit containing a linear integrated circuit and a negative voltage feedback loop, wherein the primary winding of the first transformer is connected in series with the line and the secondary winding of the same transformer is connected to the input of the amplifier unit, the primary winding of the second transformer is connected to the output of the amplifier unit and the secondary winding of the second transformer is connected in series with the line and with the primary winding of the first transformer, and wherein said equalizing and gain regulating network is connected in the negative voltage feedback loop of the amplifier unit.
Claim 2
Dependent Claim
132 words
A negative impedance amplifier for a transmission line, including an equalizing and gain regulating network, and comprising two transformers each having primary and secondary windings, and an amplifier unit containing a linear integrated circuit and a negative voltage feedback loop, wherein the primary winding of the first transformer is connected in series with the line and the secondary winding of the same transformer is connected to the input of the amplifier unit, the primary winding of the second transformer is connected to the output of the amplifier unit and the secondary winding of the second transformer is connected in series with the line and with the primary winding of the first transformer, and wherein said equalizing and gain regulating network is connected in the negative voltage feedback loop of the amplifier unit.
Claim 3
Dependent Claim
59 words
A negative impedance amplifier according to claim 1, further comprising a first rectifier placed between the output terminal of the amplifier unit and the ground, and a second rectifier placed between the output terminal of the amplifier unit and the input supplying the amplifier unit, the polarities of the rectifiers being selected so that they are normally in cut-off.
Claim 4
Dependent Claim
128 words
A negative impedance amplifier for a transmission line, including an equalizing and gain regulating network, and comprising two transformers each having primary and secondary windings, and an amplifier unit containing a linear integrated circuit and a negative current feedback loop, wherein the primary winding of the first transformer is connected in parallel with the line and the secondary winding of the same transformer is connected to the input terminals of the amplifier unit, the primary winding of the second transformer is connected between the output terminal of the amplifier unit and the ground, and the secondary winding of the second transformer is connected in parallel with the line, and wherein said equalizing and gain regulating network is connected in the negative current feed-back loop of the amplifier unit.
Claim 5
Dependent Claim
128 words
A negative impedance amplifier for a transmission line, including an equalizing and gain regulating network, and comprising two transformers each having primary and secondary windings, and an amplifier unit containing a linear integrated circuit and a negative current feedback loop, wherein the primary winding of the first transformer is connected in parallel with the line and the secondary winding of the same transformer is connected to the input terminals of the amplifier unit, the primary winding of the second transformer is connected between the output terminal of the amplifier unit and the ground, and the secondary winding of the second transformer is connected in parallel with the line, and wherein said equalizing and gain regulating network is connected in the negative current feed-back loop of the amplifier unit.
Claim 6
Dependent Claim
59 words
A negative impedance amplifier according to claim 3, further comprising a first rectifier connected between the output terminal of the amplifier unit and the ground, and a second rectifier connected between the output terminal of the amplifier unit and the input supplying the amplifier unit, the polarities of said rectifier being selected so that they are normally in cut-off.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |