GB1218947A - Method and means for reducing the cross modulation distortion of travelling-wave tube amplifiers - Google Patents
Method and means for reducing the cross modulation distortion of travelling-wave tube amplifiersInfo
- Publication number
- GB1218947A GB1218947A GB2141968A GB2141968A GB1218947A GB 1218947 A GB1218947 A GB 1218947A GB 2141968 A GB2141968 A GB 2141968A GB 2141968 A GB2141968 A GB 2141968A GB 1218947 A GB1218947 A GB 1218947A
- Authority
- GB
- United Kingdom
- Prior art keywords
- input
- amplifier
- travelling
- wave tube
- voltage dependent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/33—Modifications of amplifiers to reduce non-linear distortion in discharge-tube amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
- H03F3/608—Reflection amplifiers, i.e. amplifiers using a one-port amplifying element and a multiport coupler
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
1,218,947. Travelling-wave tube amplifiers. ELEKTROMEMECHANIKAI VALLALAT. 6 May, 1968 [5 May, 1967], No. 21419/68. Heading H3W. A method of reducing cross-modulation distortion, of travelling-wave tube amplifiers 24, comprises modifying the input signal to compensate for the distortion at least in part by adding to the input a time displaced signal, derived from the input signal the phase of which is made dependent on the modulation content of the input signal. The input modulated signal is demodulated at 2 and fed via a broad band amplifier 3 to level regulators 4, 5 which control a voltage dependent reactor 8 such as one or more varactor diodes and a voltage dependent resistance 13 such as one or more diodes. The voltage dependent reactor and resistance 8, 13 pre-distort the phase and amplitude of the input to the travelling wave tube amplifier 23 via ports 7 and 15 of a circulator 6 in dependence on the frequency and amplitude of the modulation content. The working points of the voltage dependent reactor and resistance 8, 13 are adjustable by potential dividers 11 and 17. A delay cable 19 connects the modulated output from a generator to the input 20 of the circulator 6 and the lengths of the cable 19 in relation to the distance between the demodulator 2 and the input 20 is such as to compensate for phase delay set up in amplifier 3. The voltage dependent resistance 13 may alternatively be connected to the output 7 (Fig. 4, not shown). The amplifier 3 may include a frequency dependent phase adjuster (21, Fig. 5, not shown) before the amplifier (22) and/or a frequency dependent amplitude corrector which also provide predistortion signals.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HUEE001390 | 1967-05-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1218947A true GB1218947A (en) | 1971-01-13 |
Family
ID=10995232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2141968A Expired GB1218947A (en) | 1967-05-05 | 1968-05-06 | Method and means for reducing the cross modulation distortion of travelling-wave tube amplifiers |
Country Status (4)
Country | Link |
---|---|
AT (1) | AT290625B (en) |
DE (1) | DE1766313A1 (en) |
FR (1) | FR1565813A (en) |
GB (1) | GB1218947A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2147167A1 (en) * | 1970-09-23 | 1972-04-06 | Communications Satellite Corp | Device for reducing the intermediate modulation |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2422289A1 (en) * | 1978-04-03 | 1979-11-02 | Centre Nat Etd Spatiales | Phase linearising circuit for travelling wave tube amplifier - has AGC circuit feeding pre-distortion circuit introducing phase distortion |
DE3033288A1 (en) * | 1980-09-04 | 1982-04-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | METHOD FOR BROADBAND LINEARIZATION OF MICROWAVE AMPLIFIERS |
-
1968
- 1968-05-03 FR FR1565813D patent/FR1565813A/fr not_active Expired
- 1968-05-03 DE DE19681766313 patent/DE1766313A1/en active Pending
- 1968-05-06 AT AT435868A patent/AT290625B/en not_active IP Right Cessation
- 1968-05-06 GB GB2141968A patent/GB1218947A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2147167A1 (en) * | 1970-09-23 | 1972-04-06 | Communications Satellite Corp | Device for reducing the intermediate modulation |
Also Published As
Publication number | Publication date |
---|---|
DE1766313A1 (en) | 1971-07-01 |
AT290625B (en) | 1971-06-11 |
FR1565813A (en) | 1969-05-02 |
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