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 amplifiers

Info

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
Application number
GB2141968A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELEKTROMECHANIKAI VALALAT
Original Assignee
ELEKTROMECHANIKAI VALALAT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ELEKTROMECHANIKAI VALALAT filed Critical ELEKTROMECHANIKAI VALALAT
Publication of GB1218947A publication Critical patent/GB1218947A/en
Expired legal-status Critical Current

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

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.
GB2141968A 1967-05-05 1968-05-06 Method and means for reducing the cross modulation distortion of travelling-wave tube amplifiers Expired GB1218947A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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
FR1565813A (en) 1969-05-02
DE1766313A1 (en) 1971-07-01
AT290625B (en) 1971-06-11

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