US3668533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feedback control systems
Assignee: Plessey Handel und Investments AG
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Filing: 1971-01-11
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Granted: 1972-06-06
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Expires: 1991-01-11
Abstract
Abstract An amplifier arrangement includes an amplifier and a feed back system for maintaining the amplifier operating at a direct point on a non-linear part of its characteristic. The feed back system includes a generator for adding a pilot signal to the main input signal to the amplifier and a detector for detecting the amplified pilot signal. The amplitude of the amplified pilot signal will depend upon the operating point of the amplifier in its characteristic. By comparing the amplified pilot signal with a reference signal representative of a desired point in the amplifier characteristic, the amplitude of the main input signal is varied to maintain the amplifier operating at the desired point.
Inventors
- 👤 Percy J Fish
- 👤 Malcolm B Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:48
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
231 words
An amplifier arrangement comprising, an amplifier having an input for receiving an input signal and an output, and a feed back control system connected between the Output and input of the amplifier for maintaining the amplifier operating at a predetermined point in the non linear region of its characteristic, the control system including, generating means connected to the input of the amplifier to add an incremental component to the input signal before it is amplified by the amplifier, sensing means connected to the output of the amplifier to selectively sense the incremental component after amplification by the amplifier and to derive therefrom a first signal the amplitude of which is representative of the instantaneous slope at the point in the non linear region of its characteristic at which the amplifier is operating, reference means for providing a reference signal the amplitude of which is representative of the instantaneous slope at the predetermined operating point of the amplifier, comparing means connected to the sensing means and the reference means to provide an output representative of the difference in amplitude if any between the first signal and the reference signal, and control means connected to receive the output of the comparing means and the input signal and operative to modify the amplitude of the input signal in such a sense as to tend to reduce the output from the comparing means to zero.
Claim 2
Dependent Claim
231 words
An amplifier arrangement comprising, an amplifier having an input for receiving an input signal and an output, and a feed back control system connected between the Output and input of the amplifier for maintaining the amplifier operating at a predetermined point in the non linear region of its characteristic, the control system including, generating means connected to the input of the amplifier to add an incremental component to the input signal before it is amplified by the amplifier, sensing means connected to the output of the amplifier to selectively sense the incremental component after amplification by the amplifier and to derive therefrom a first signal the amplitude of which is representative of the instantaneous slope at the point in the non linear region of its characteristic at which the amplifier is operating, reference means for providing a reference signal the amplitude of which is representative of the instantaneous slope at the predetermined operating point of the amplifier, comparing means connected to the sensing means and the reference means to provide an output representative of the difference in amplitude if any between the first signal and the reference signal, and control means connected to receive the output of the comparing means and the input signal and operative to modify the amplitude of the input signal in such a sense as to tend to reduce the output from the comparing means to zero.
Claim 3
Dependent Claim
73 words
An arrangement according to claim 1, wherein the sensing means includes, logarithmic amplification means for amplifying the sensed signal, and a phase-sensitive detector having first and second inputs, said first input being connected to the output of the amplification means and the second input being connected to the generating means, the generating means providing a phase reference signal for the detector whereby the detector selects the amplified incremental component from the sensed signal.
Claim 4
Dependent Claim
14 words
An arrangement according to claim 1, wherein the control means comprises a P.I.M. diode.
Claim 5
Dependent Claim
14 words
An arrangement according to claim 1, wherein the comparing means comprises an integrating amplifier.
Claim 6
Dependent Claim
58 words
An arrangement according to claim 1, wherein said generating means includes a modulator for sinusoidally modulating the input signal and wherein said sensing means includes a detector connected to the output of the amplifier, the detector operating in accordance with a square law to produce an output voltage which is proportional to the power output of the amplifier.
Claim 7
Dependent Claim
52 words
An arrangement according to claim 1, for use with a pulsed input signal, including means for receiving the input signal and having an output connected to the comparing means to gate the comparing means in synchronism with the input signal so that the difference signal is averaged over a plurality of pulses.
Claim 8
Dependent Claim
26 words
An arrangement according to claim 6 wherein the generating means is operable to generate alternatively positive and negative incremental components in synchronism with the input pulses.
References Cited (Backward Citations)
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US2758281A
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |