Patent US4331928A successfully refreshed from Google Patents.
US4331928A
Expired / Lapsed
US
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Referenced phase RF feedback linear amplifier
Assignee: Boeing North American Inc
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Filing: 1980-06-02
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Granted: 1982-05-25
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Expires: 2000-06-02
Abstract
Abstract A feedback network for a linear amplifier provides for sampling the input signal and removing the modulation from the input signal while maintaining a 180° phase relationship with the input which is essentially the process of converting it into a square wave. The output signal is also sampled and the envelope separated from the sampled output signal and used to drive a modulator which modulates the square wave. This modulated square wave is then mixed with the input signal prior to amplification. In addition, automatic gain control is provided by a level comparator that compares the output signal with the input signal and the results of the comparison is used to attenuate or to control the level of the modulated square wave.
Inventors
- 👤 Marvin W. Heidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:51
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3241; H03F1/3247; H03F2200/00; H03F2200/102; H03F2201/00; H03F2201/32; H03F2201/3227
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A feedback network for a linear amplifier comprising: mixer means for mixing an input signal to the linear amplifier with a feedback signal; circuit means for converting the input signal into a square wave; detector means for separating an envelope signal from the linear amplifier output signal; and modulator means for modulating the square wave with the envelope signal to obtain the feedback signal.
Claim 2
Dependent Claim
64 words
A feedback network for a linear amplifier comprising: mixer means for mixing an input signal to the linear amplifier with a feedback signal; circuit means for converting the input signal into a square wave; detector means for separating an envelope signal from the linear amplifier output signal; and modulator means for modulating the square wave with the envelope signal to obtain the feedback signal.
Claim 3
Dependent Claim
41 words
The feedback network for a linear amplifier according to claim 1 further comprising: comparator means for comparing the input signal with the output signal to obtain a control signal; and attenuator means to attenuate the feedback signal with the control signal.
Claim 4
Dependent Claim
27 words
The feedback network for a linear amplifier according to claim 2 further comprising a harmonic filter connected in series with the attenuator means and the mixer means.
Claim 5
Dependent Claim
41 words
The feedback network for a linear amplifier according to claims 1 or 2 wherein the means for converting the input signal into a square wave comprises a high gain amplifier connected in series with the input signal and the modulator means.
Claim 6
Independent Claim
57 words
A method of phase compensating the feedback signal of a linear amplifier comprising: mixing an input signal to the linear amplifier with a feedback signal; converting the input signal into a square wave; separating an envelope signal from the linear amplifier's output signal; and modulating the square wave with the envelope signal to obtain the feedback signal.
Claim 7
Independent Claim
57 words
A method of phase compensating the feedback signal of a linear amplifier comprising: mixing an input signal to the linear amplifier with a feedback signal; converting the input signal into a square wave; separating an envelope signal from the linear amplifier's output signal; and modulating the square wave with the envelope signal to obtain the feedback signal.
Claim 8
Dependent Claim
43 words
The method of phase compensating the feedback signal of a linear amplifier according to claim 5 further comprising the steps of: comparing the input signal with the output signal to obtain a control signal; and attenuating the feedback signal with a control signal.
References Cited (Backward Citations)
US3777275A
Cited
US3909742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |