US4532478A
Expired / Lapsed
US
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Phase adjusted feedforward system utilizing a single amplitude/phase equalizer
Assignee: Boeing North American Inc
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Filing: 1984-05-30
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Granted: 1985-07-30
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Expires: 2004-05-30
Abstract
Abstract There is disclosed a feedforward system which reduces the phase and amplitude equalizer circuits necessary to provide for circuit operation. The main and error amplifiers of a phase adjusted feedforward system are constructed to have essentially equivalent delay and gain characteristics. The two loops formed by the main and error amplifiers are then phase and amplitude equalized by use of one phase/amplitude equalizer in the small signal loop between the output coupler and the hybrid junction. The circuit may be implemented with less complex structure, thereby resulting in additional circuit simplification and less cost.
Inventors
- 👤 Edward G. Silagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:21
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3223; H03F1/3229
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
A phase adjusted feedforward amplifier system comprising: means for providing an input signal; means for sampling said input signal and providing a sampled input signal; means for amplifying said sampled input signal and providing a main amplified output signal; means for sampling said main amplified output signal for providing a sampled output signal; means for phase and amplitude equalizing said sampled output signal to produce a phase and amplitude equalized sampled output signal; means for subtracting said sampled input signal from said phase and amplitude equalized sampled output signal to produce an error signal; means for amplifying said error signal to produce a correction signal; and means for subtracting said correction signal from said main amplified output signal to produce an amplified output of said input signal.
Claim 2
Dependent Claim
127 words
A phase adjusted feedforward amplifier system comprising: means for providing an input signal; means for sampling said input signal and providing a sampled input signal; means for amplifying said sampled input signal and providing a main amplified output signal; means for sampling said main amplified output signal for providing a sampled output signal; means for phase and amplitude equalizing said sampled output signal to produce a phase and amplitude equalized sampled output signal; means for subtracting said sampled input signal from said phase and amplitude equalized sampled output signal to produce an error signal; means for amplifying said error signal to produce a correction signal; and means for subtracting said correction signal from said main amplified output signal to produce an amplified output of said input signal.
Claim 3
Dependent Claim
23 words
The system of claim 1 wherein said means for subtracting said sampled input signal and said sampled output signal comprises a hybrid junction.
Claim 4
Dependent Claim
18 words
The system of claim 1 wherein said means for amplifying is a high power, high frequency power amplifier.
Claim 5
Dependent Claim
97 words
In a feedforward power amplifying system having a radio frequency input signal, an amplifier for amplifying said input signal and providing an amplified output signal, means for sampling said input and output signals, means for subtracting the sampled input signal from the sampled output signal to produce an error signal, means for amplifying the error signal to produce a correction signal, and means for subtracting the correction signal from the output signal to produce an amplified radio frequency output, the improvement in said feedforward system comprising: means for phase and amplitude equalizing only said sampled output signal.
Claim 6
Dependent Claim
97 words
In a feedforward power amplifying system having a radio frequency input signal, an amplifier for amplifying said input signal and providing an amplified output signal, means for sampling said input and output signals, means for subtracting the sampled input signal from the sampled output signal to produce an error signal, means for amplifying the error signal to produce a correction signal, and means for subtracting the correction signal from the output signal to produce an amplified radio frequency output, the improvement in said feedforward system comprising: means for phase and amplitude equalizing only said sampled output signal.
Claim 7
Dependent Claim
30 words
The system of claim 4 wherein said means for amplifying said input signal and said means for amplifying said error signal are amplifiers having substantially identical gain and delay characteristics.
Claim 8
Dependent Claim
154 words
A phase adjusted feedforward amplifier system comprising: means for providing an input signal; means for sampling said input signal and providing a sampled input signal; means for amplifying said sampled input signal comprising an amplifier having predetermined gain and delay characteristics and providing a main amplified output signal; means for sampling said main amplified output signal for providing a sampled output signal; means for phase and amplitude equalizing said sampled output signal to produce a phase and amplitude equalized sampled output signal; means for subtracting said sampled input signal from said phase and amplitude equalized sampled output signal to produce an error signal; means for amplifying said error signal comprising an amplifier having substantially identical gain and delay characteristics as said means for amplifying said input signal to produce a correction signal; and means for subtracting said correction signal from said main amplified output signal to produce an amplified output of said input signal.
Claim 9
Dependent Claim
154 words
A phase adjusted feedforward amplifier system comprising: means for providing an input signal; means for sampling said input signal and providing a sampled input signal; means for amplifying said sampled input signal comprising an amplifier having predetermined gain and delay characteristics and providing a main amplified output signal; means for sampling said main amplified output signal for providing a sampled output signal; means for phase and amplitude equalizing said sampled output signal to produce a phase and amplitude equalized sampled output signal; means for subtracting said sampled input signal from said phase and amplitude equalized sampled output signal to produce an error signal; means for amplifying said error signal comprising an amplifier having substantially identical gain and delay characteristics as said means for amplifying said input signal to produce a correction signal; and means for subtracting said correction signal from said main amplified output signal to produce an amplified output of said input signal.
References Cited (Backward Citations)
DE2656436A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |