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US3667065A
Expired / Lapsed
US
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Feed-forward amplifier having arbitrary gain-frequency characteristic
Assignee: AT&T Inc
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Filing: 1970-09-04
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Granted: 1972-05-30
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Expires: 1990-09-04
Abstract
Abstract Frequency-shaping of the gain characteristic of a feed-forward, error-corrected amplifier using main and error amplifiers having essentially flat, or frequency-independent gain characteristics, is achieved by tapering the power division characteristics of: the input coupler, which extracts a reference signal component from the input signal; the sampling coupler, which compares the output from the main amplifier with the reference signal to form an error signal; and the error injection coupler, which injects the error signal into the main signal path. In a second embodiment of the invention, the band-shaping burden is shared between the amplifiers and the couplers.
Inventors
- 👤 Henry Richard Beurrier
- 👤 Harold Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:04
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3223; H03F1/3229; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1217; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/06; H04J; H04J1/00; H04J1/02; H04J1/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
189 words
A feed-forward electromagnetic signal amplifier having an arbitrary gain-frequency characteristic F( omega ) over a frequency band of interest comprising: first and second wavepaths; the first of said wavepaths including, in cascade, a main signal amplifier and a first delay network; the second of said wavepaths including, in cascade, a second delay network and an error amplifier; input means for dividing an input signal into components and for coupling a different one of said components to the input end of each of said wavepaths; sampling means for coupling a portion of the signal output from said main amplifier to the input to said error amplifier; and error injection means for coupling the output from said error amplifier into said first wavepath in time and phase to minimize error components in the output signal; characterized in that: g said input means, said sampling means and said error injection means are reactive networks having two pairs of conjugate ports, and each of which has a coefficient of transmission ti and a coefficient of coupling ki which vary as a function of F( omega ), where ti 2 + ki 2 1.
Claim 2
Dependent Claim
189 words
A feed-forward electromagnetic signal amplifier having an arbitrary gain-frequency characteristic F( omega ) over a frequency band of interest comprising: first and second wavepaths; the first of said wavepaths including, in cascade, a main signal amplifier and a first delay network; the second of said wavepaths including, in cascade, a second delay network and an error amplifier; input means for dividing an input signal into components and for coupling a different one of said components to the input end of each of said wavepaths; sampling means for coupling a portion of the signal output from said main amplifier to the input to said error amplifier; and error injection means for coupling the output from said error amplifier into said first wavepath in time and phase to minimize error components in the output signal; characterized in that: g said input means, said sampling means and said error injection means are reactive networks having two pairs of conjugate ports, and each of which has a coefficient of transmission ti and a coefficient of coupling ki which vary as a function of F( omega ), where ti 2 + ki 2 1.
Claim 3
Dependent Claim
31 words
The amplifier according to claim 1 wherein the gain characteristic of the main amplifier and the gain characteristic of the error amplifier are independent of frequency over the band of interest.
Claim 4
Dependent Claim
28 words
The amplifier according to claim 1 where the gain characteristic of the main amplifier and the gain characteristic of the error amplifier vary as a function of frequency.
Claim 5
Dependent Claim
31 words
The amplifier according to claim 1 wherein the coefficients of transmission t1, t2 and t3, of said input means, said sampling means and said error injection means are given, respectively, by
References Cited (Backward Citations)
US3541467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |