Patent US3860767A successfully refreshed from Google Patents.
US3860767A
Expired / Lapsed
US
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Voice frequency repeater
Assignee: CMC TELECOM Corp
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Filing: 1972-09-26
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Granted: 1975-01-14
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Expires: 1992-09-26
Abstract
Abstract A negative impedance repeater gain unit connected to a pair of line build-out matching networks. The gain unit includes a shunt converter and a series converter, each having a plurality of amplifying transistors therein. A portion of the biasing circuit for the transistors is common to both converters, and zener diodes are used for transistor protection. The line build-out matching network includes: a low-frequency corrector having a fixed capacitance, together with resistance and inductance elements switched in and out of the corrector circuit; a highfrequency corrector having a capacitance which can be switched in and out of the corrector circuit depending upon the intended loading; a plurality of build-out capacitance and resistance elements transformed into the output circuit. The entire device is mounted on a panel board.
Inventors
- 👤 C Wendell Boucher
- 👤 Thomas W Hanneman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:17
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
64 words
A negative impedance repeater comprising: a. a connecting transformer; b. a separate, distinct series converter and a separate, distinct shunt converter each connected to said connecting transformer; c. said converters each having a plurality of amplifying semiconductor means; and d. a biasing circuit for said semiconductor means, a portion of said biasing circuit being common to the semiconductor means in both of said converters.
Claim 2
Dependent Claim
64 words
A negative impedance repeater comprising: a. a connecting transformer; b. a separate, distinct series converter and a separate, distinct shunt converter each connected to said connecting transformer; c. said converters each having a plurality of amplifying semiconductor means; and d. a biasing circuit for said semiconductor means, a portion of said biasing circuit being common to the semiconductor means in both of said converters.
Claim 3
Dependent Claim
23 words
A negative impedance repeater as defined in claim 1 wherein said common portion of the biasing circuit means includes a plurality of resistors.
Claim 4
Dependent Claim
17 words
A negative impedance repeater as defined in claim 1 including semiconductor overvoltage protection means for said semiconductors.
Claim 5
Dependent Claim
16 words
A negative impedance repeater as defined in claim 3 wherein said protection means are zener diodes.
Claim 6
Dependent Claim
36 words
A negative impedance repeater as defined in claim 1 including means for setting the gain on at least one of said converters, said setting means including a plurality of resistors which are either ''''on'''' or ''''off''''.
Claim 7
Dependent Claim
20 words
A negative impedance repeater as defined in claim 1 including a line build-out matching network connected to said transformer means.
Claim 8
Dependent Claim
42 words
A negative impedance repeater as defined in claim 6, said network including a low-frequency corrector, a high frequency corrector connected to said low-frequency corrector, said high-frequency corrector connected to an output, and variable build-out capacitance and resistance means connected to said output.
Claim 9
Dependent Claim
23 words
A negative impedance repeater as defined in claim 7 including a build-out transformer connecting said build-out capacitance and resistance means to said output.
Claim 10
Dependent Claim
38 words
A negative impedance repeater as defined in claim 7 wherein said variable capacitance and resistance means include a plurality of capacitors and resistors respectively, and a two-state switch connecting each of said capacitors and resistors into the output.
Claim 11
Dependent Claim
39 words
A negative impedance repeater as defined in claim 7 wherein said low-frequency corrector includes a shunt circuit having a fixed capacitor, a plurality of resistor circuit means and inductor circuit means which can be switched into said shunt circuit.
Claim 12
Dependent Claim
36 words
A negative impedance repeater as defined in claim 7 wherein said high-frequency corrector includes a first capacitance and a second capacitance and means for switching said second capacitance in and out of the high-frequency corrector circuit.
Claim 13
Dependent Claim
45 words
A negative impedance repeater as defined in claim 6 wherein said converters and said matching network are mounted on a single panel, and wherein essentially only capacitive, inductive and switching elements are mounted separately thereon, the remainder of the circuitry formed in integrated circuit form.
Claim 14
Dependent Claim
143 words
A line build-out network comprising: a. a pair of input terminals; b. a low-frequency corrector connected across said input terminals; c. a coupling transformer including a separate primary winding connected to each one of said input terminals; d. a build-out transformer including a plurality of windings; e. a variable build-out capacitance and a variable build-out resistance wherein said variable capacitance is connected to said separate primary windings through first and second windings of said build-out transformer, said variable capacitance is connected to said output terminals through third and fourth windings of said build-out transformer and said variable resistance is coupled to both said separate primary windings and said output terminals through a fifth winding of said buildout transformer; ,and, f. a high frequency corrector including a secondary winding of said coupling transformer, said corrector coupled to said input terminals through said coupling transformer.
Claim 15
Dependent Claim
143 words
A line build-out network comprising: a. a pair of input terminals; b. a low-frequency corrector connected across said input terminals; c. a coupling transformer including a separate primary winding connected to each one of said input terminals; d. a build-out transformer including a plurality of windings; e. a variable build-out capacitance and a variable build-out resistance wherein said variable capacitance is connected to said separate primary windings through first and second windings of said build-out transformer, said variable capacitance is connected to said output terminals through third and fourth windings of said build-out transformer and said variable resistance is coupled to both said separate primary windings and said output terminals through a fifth winding of said buildout transformer; ,and, f. a high frequency corrector including a secondary winding of said coupling transformer, said corrector coupled to said input terminals through said coupling transformer.
Claim 16
Dependent Claim
38 words
A line build-out network as defined in claim 13 wherein said variable capacitance and resistance each include a plurality of capacitors and resistors respectively, and a two-state switch connecting each of said capacitors and resistors to said output.
Claim 17
Dependent Claim
39 words
A line build-out network as defined in claim 13 wherein said low-frequency corrector includes a shunt circuit having a fixed capacitor, a plurality of resistor circuit means and inductor circuit means which can be switched into said shunt circuit.
Claim 18
Dependent Claim
36 words
A line build-out network as defined in claim 13 wherein said high-frequency corrector includes a first capacitance and a second capacitance and means for switching said second capacitance in and out of the high-frequency corrector circuit.
References Cited (Backward Citations)
US2232642A
Cited
US2957944A
Cited
US2978542A
Cited
US2998581A
Cited
US2963558A
Cited
US3042759A
Cited
US3024324A
Cited
US3135930A
Cited
US3303437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |