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US4255724A
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Distortion-corrector for microwave tubes
Assignee: Thales SA
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Filing: 1978-11-29
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Granted: 1981-03-10
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Expires: 1998-11-29
Abstract
Abstract A distortion-corrector which comprises a filter of the low-pass type, of the π or T configuration, and two diodes, in parallel opposition, disposed between the input and output of the filter. This corrector compensates amplitude-and-phase- distortions of the tube associated with the corrector, over a given operational frequency-band of the tube which is below the cut-off frequency of the filter, by compressing weak signals, for which no diode conducts, with respect to strong signals, for which there is at least a start of conduction of one of the diodes and by producing a phase-lead which increases with the input power of the tube.
Inventors
- 👤 Jean-Pierre Bergero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:42
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54; H03F3/58; H03H; H03H7/00; H03H7/01; H03H7/0107
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
Distortion-corrector for microwave tubes which comprises: a filter of the low-pass type, having an input and an output; two diodes connected in parallel opposition, said two diodes being disposed between the input and output of the filter; this corrector compensating amplitude- and phase-distortions of the tube associated with the corrector, over a given operational frequency-band of the tube which is below the cut-off frequency of the filter, by compressing weak signals, for which no diode conducts, with respect to strong signals, for which there is at least a start of conduction of one of the diode, and by producing a phase-lead which increases with the input power of the filter.
Claim 2
Dependent Claim
110 words
Distortion-corrector for microwave tubes which comprises: a filter of the low-pass type, having an input and an output; two diodes connected in parallel opposition, said two diodes being disposed between the input and output of the filter; this corrector compensating amplitude- and phase-distortions of the tube associated with the corrector, over a given operational frequency-band of the tube which is below the cut-off frequency of the filter, by compressing weak signals, for which no diode conducts, with respect to strong signals, for which there is at least a start of conduction of one of the diode, and by producing a phase-lead which increases with the input power of the filter.
Claim 3
Dependent Claim
32 words
Distortion-corrector according to claim 1, wherein the filter of the low-pass type is a π filter, comprising a condenser in each of its vertical branches and an inductance in its horizontal branch.
Claim 4
Dependent Claim
38 words
Distortion-corrector according to claim 1, wherein the filter of the low-pass type is a T filter, comprising two inductances in its horizontal branch and a condenser in its vertical branch connected to the junction of the two inductances.
Claim 5
Dependent Claim
14 words
Distortion-corrector according to claim 1, wherein the diodes used are of the Schottky type.
Claim 6
Dependent Claim
16 words
Distortion-corrector according to claim 2 or to claim 3, wherein the condensers are variable-length open lines.
Claim 7
Dependent Claim
28 words
Distortion-corrector according to claim 1, wherein the phase-distortion correction is adjustable by action on the cut-off frequency of the filter and on the relative values of its components.
Claim 8
Dependent Claim
66 words
Distortion-corrector device for microwave tubes which comprises: a distortion-corrector according to claim 1; a variable attenuator, preceding this corrector, which allows to adapt the amplitude- and phase-distortions correction to the microwave tube, associated to the corrector and operating in a given operational frequency-band; a variable gain amplifier, following this corrector, which compensates the attenuation imparted by the attenuator to the input signal of the distortion-corrector device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |