Patent US3904992A successfully refreshed from Google Patents.
US3904992A
Expired / Lapsed
US
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Two-port network for signal transmission equalization
Assignee: NEC Corp
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Filing: 1974-02-08
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Granted: 1975-09-09
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Expires: 1994-02-08
Abstract
Abstract A two-port network for use in transmission line equalizers in repeatered wide-band communication systems is disclosed. The network includes a single one-port uniformly-distributed RC network connected between corresponding terminals of the input and output ports. A capacitance element is connected between the terminals of the output port. The two-port network is adapted to integrated circuit construction and may be cascaded through buffer amplifiers. Alternatively, the two-port network may form a part of a feedback equalizer. In one embodiment, the capacitance element is a variable-capacitance diode controlled by a peak detector. In another embodiment, the two-port network is used as the feedback circuit.
Inventors
- 👤 Takuya Iwakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:48
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1204
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
A transmission line equalizer comprising: a plurality of two-port networks each including an input port, an output port, one terminal of said output port being directly connected to one terminal of said input port, a single one-port uniformly-distributed RC network connected between the other terminal of said input port and the other terminal of said output port, said single oneport uniformlydistributed RC network including a dielectric plate having a uniform dielectric constant, a resistive layer of a constant specific resistance formed on one major surface of said dielectric plate, a conductive layer formed on the other major surface of said dielectric plate, and first and second conductor strips disposed on said resistive layer at opposite edges of said dielectric plate, and a capacitance element connected between said terminals of said output port, and a plurality of buffer amplifiers connecting said plurality of two-port networks in cascade.
Claim 2
Dependent Claim
146 words
A transmission line equalizer comprising: a plurality of two-port networks each including an input port, an output port, one terminal of said output port being directly connected to one terminal of said input port, a single one-port uniformly-distributed RC network connected between the other terminal of said input port and the other terminal of said output port, said single oneport uniformlydistributed RC network including a dielectric plate having a uniform dielectric constant, a resistive layer of a constant specific resistance formed on one major surface of said dielectric plate, a conductive layer formed on the other major surface of said dielectric plate, and first and second conductor strips disposed on said resistive layer at opposite edges of said dielectric plate, and a capacitance element connected between said terminals of said output port, and a plurality of buffer amplifiers connecting said plurality of two-port networks in cascade.
Claim 3
Dependent Claim
169 words
A transmission line equalizer comprising: a two-port network including an input port, an output port, one terminal of said output port being directly connected to one terminal of said input port, a single one-port uniformly-distributed RC network connected between the other terminal of said input port and the other terminal of said output port, said single one-port uniformly-distributed RC network including a dielectric plate having a uniform dielectric constant, a resistive layer of a constant specific resistance formed on one major surface of said dielectric plate, a conductive layer formed on the other major surface of said dielectric plate, and first and second conductor strips disposed on said resistive layer at opposite edges of said dielectric plate, and a variable-capacitance diode connected between said terminals of said oUtput port, an amplifier having its input connected to said output port and detecting means connected to the output of said amplifier for detecting the peak value of said amplifier output and adjusting the value of the capacitance of said variable-capacitance diode.
Claim 4
Dependent Claim
169 words
A transmission line equalizer comprising: a two-port network including an input port, an output port, one terminal of said output port being directly connected to one terminal of said input port, a single one-port uniformly-distributed RC network connected between the other terminal of said input port and the other terminal of said output port, said single one-port uniformly-distributed RC network including a dielectric plate having a uniform dielectric constant, a resistive layer of a constant specific resistance formed on one major surface of said dielectric plate, a conductive layer formed on the other major surface of said dielectric plate, and first and second conductor strips disposed on said resistive layer at opposite edges of said dielectric plate, and a variable-capacitance diode connected between said terminals of said oUtput port, an amplifier having its input connected to said output port and detecting means connected to the output of said amplifier for detecting the peak value of said amplifier output and adjusting the value of the capacitance of said variable-capacitance diode.
Claim 5
Dependent Claim
24 words
A transmission line equalizer as recited in claim 2 comprising a plurality of said two-port network, amplifier and detecting means combinations connected in cascade.
Claim 6
Dependent Claim
181 words
A transmission line equalizer comprising: a two-port network including an input port, an output port, one terminal of said output port being directly connected to one terminal of said input port, a single one-port uniformly-distributed RC network connected between the other terminal of said input port and the other terminal of said output port, said single one-port uniformly-distributed RC network including a dielectric plate having a uniform dielectric constant, a resistive layer of a constant specific resistance formed on one major surface of said dielectric plate, a conductive layer formed on the major surface of said dielectric plate, and first and second conductor strips disposed on said resistive layer at opposite edges of said dielectric plate, and a capacitance element connected between said terminals of said output port, and an amplifier having an input port, said two-port network connected as a feedback circuit between said amplifier input and output, one terminal of said input and output ports being connected to the common terminal of said amplifier output, and said other terminal of said output port being connected to said amplifier input.
Claim 7
Dependent Claim
181 words
A transmission line equalizer comprising: a two-port network including an input port, an output port, one terminal of said output port being directly connected to one terminal of said input port, a single one-port uniformly-distributed RC network connected between the other terminal of said input port and the other terminal of said output port, said single one-port uniformly-distributed RC network including a dielectric plate having a uniform dielectric constant, a resistive layer of a constant specific resistance formed on one major surface of said dielectric plate, a conductive layer formed on the major surface of said dielectric plate, and first and second conductor strips disposed on said resistive layer at opposite edges of said dielectric plate, and a capacitance element connected between said terminals of said output port, and an amplifier having an input port, said two-port network connected as a feedback circuit between said amplifier input and output, one terminal of said input and output ports being connected to the common terminal of said amplifier output, and said other terminal of said output port being connected to said amplifier input.
Claim 8
Dependent Claim
18 words
A transmission line equalizer as recited in claim 4 wherein said capacitance element is a variable capacitance element.
Claim 9
Dependent Claim
22 words
A transmission line equalizer as recited in claim 4 comprising a plurality of said amplifier and two-port network combinations connected in cascade.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |