US3944943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband amplifier
Assignee: GTE Sylvania Inc
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Filing: 1974-11-29
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Granted: 1976-03-16
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Expires: 1994-11-29
Abstract
Abstract A broadband amplifier with a negative feedback circuit having a variable resistance means and first and second parallel resistor-inductor combinations for slope control is shown. The variable resistance means establishes the overall frequency response and can be electronically varied to provide automatic gain control. The first and second parallel resistor-inductor combinations provide compensation for deviations from the desired frequency response over respective first and second frequency ranges.
Inventors
- 👤 Frederick Frank Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:57
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/10; H04N7/102; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/06; H04B3/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
A broadband amplifier having a negative feedback path from the collector to the base of a transistor including a series connection of a resistive means and a first parallel combination of a first resistor and first inductor for providing the amplifier with a gain approximately proportional to the square root of frequency, the improvement comprising a second parallel combination of a second resistor and a second inductor connected in series with said first parallel combination in said negative feedback path, said second parallel combination having a resistance-to-inductance ratio lower than the ratio of said first parallel combination.
Claim 2
Dependent Claim
97 words
A broadband amplifier having a negative feedback path from the collector to the base of a transistor including a series connection of a resistive means and a first parallel combination of a first resistor and first inductor for providing the amplifier with a gain approximately proportional to the square root of frequency, the improvement comprising a second parallel combination of a second resistor and a second inductor connected in series with said first parallel combination in said negative feedback path, said second parallel combination having a resistance-to-inductance ratio lower than the ratio of said first parallel combination.
Claim 3
Dependent Claim
24 words
A broadband amplifier as defined in claim 1 wherein said second resistor has a resistance substantially less than the resistance of said first resistor.
Claim 4
Dependent Claim
50 words
A broadband amplifier as defined in claim 2 wherein the operating bandwidth of the amplifier is at least 6 mega-Hertz to 30 mega-Hertz and said second parallel combination compensates for deviations of the gain from the square root of frequency in the operating frequency range less than approximately 10 mega-Hertz.
Claim 5
Dependent Claim
23 words
A broadband amplifier as defined in claim 1 wherein said resistive means includes a resistor and a variable resistance means connected in parallel.
Claim 6
Dependent Claim
26 words
A broadband amplifier as defined in claim 4 wherein said variable resistance means includes a diode and means for biasing said diode at an operating point.
Claim 7
Dependent Claim
118 words
In a broadband amplifier for amplifying signals in a predetermined range of frequencies coupled thereto via a segment of coaxial cable, an amplifier with a gain for substantially compensating for the attenuation of said signals by said coaxial cable as a function of frequency, said amplifier including a transistor and a negative feedback path defined by a resistive means and a parallel combination of a first inductance means and first resistor connected in series with said resistive means, the improvement comprising a parallel combination of a second inductance means and second resistor connected in series with said resistive means for compensating for deviations from the desired frequency response in a range of frequencies less than a predetermined frequency.
Claim 8
Dependent Claim
118 words
In a broadband amplifier for amplifying signals in a predetermined range of frequencies coupled thereto via a segment of coaxial cable, an amplifier with a gain for substantially compensating for the attenuation of said signals by said coaxial cable as a function of frequency, said amplifier including a transistor and a negative feedback path defined by a resistive means and a parallel combination of a first inductance means and first resistor connected in series with said resistive means, the improvement comprising a parallel combination of a second inductance means and second resistor connected in series with said resistive means for compensating for deviations from the desired frequency response in a range of frequencies less than a predetermined frequency.
Claim 9
Dependent Claim
43 words
An amplifier as defined in claim 6 wherein said first and second inductance means comprise first and second inductors, respectively, and the resistance-to-inductance ratio of said second resistor and second inductor is lower than the ratio of said first resistor and first inductor.
Claim 10
Dependent Claim
23 words
An amplifier as defined in claim 7 wherein said second resistor has a resistance substantially less than the resistance of said first resistor.
Claim 11
Dependent Claim
47 words
An amplifier as defined in claim 7 wherein the range of frequencies of said signals is at least 6 mega-Hertz to 30 mega-Hertz and said second resistor and second inductor compensate for deviations from the desired frequency response in the range of frequencies less than 10 mega-Hertz.
Claim 12
Dependent Claim
36 words
An amplifier as defined in claim 6 wherein said resistive means includes a third resistor connected in series with said first and second resistors and a variable resistance means connected in parallel with said third resistor.
Claim 13
Dependent Claim
25 words
An amplifier as defined in claim 10 wherein said variable resistance means includes a diode and means for biasing said diode at an operating point.
Claim 14
Dependent Claim
35 words
An amplifier as defined in claim 11 wherein said means for biasing includes means for developing an automatic gain control voltage dependent on the amplitude of a signal coupled via said segment of coaxial cable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |