Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1980-08-12
1983-07-05
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
315 544, 315 545, H01J 2510
Patent
active
043920799
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to electronic engineering and in particular to a method of adjusting a phase shift in an amplification multicavity klystron and a device therefor.
PRIOR ART
At the present time a phase shift of O-type amplifiers is normally stabilized by regulating power sources, particularly anode voltage sources which influence the phase shift value more markedly. So, for example, a 1% variation of anode voltage causes the phase shift of an output signal to change by tens of degrees in travelling-wave tubes and by ten or more degrees in a klystron, depending on the operating frequency band and mu factor. In stabilizing the phase shift by regulating power sources, an anode voltage stability of about 10.sup.-4 is required to obtain a phase-shift stability of some 0.1.degree. in modern radars. Considerable difficulties are encountered in providing such stability of anode voltage, particularly in pulsed operation with devices having a variable on-off ratio, a disadvantage generally resulting in increased dimensions and weight of an anode voltage source.
Known in the art are methods of enhancing stability of a phase shift in O-type devices, which permit obtaining desired stability with medium anode voltage regulation levels.
Another known method involves correction of phase differences in travelling-wave tubes operating in parallel (cf. U.S. Pat. No. 3,958,184, Cl.328-155, 1976). The aforesaid method comprises the steps of tapping a portion of an output signal from an amplifier, comparing the output signal with a signal derived from a reference system, obtaining voltage proportional to a difference in phases of the signals being compared, and utilizing said voltage for controlling a phase-shifter located ahead of the input of a travelling-wave tube. The aforesaid method has been generally unsatisfactory due to low response attributed to the operation of an a-f feedback circuit and its intricate structure, a factor substantially limiting the field of its applications.
The prototype of the hereinproposed method of adjusting a phase shift in a klystron is a known method employing negative feedback between the output and input of a klystron (cf. "Automatic Phase Incursion Control in Amplifiers" edited by M. V. Kapranov, "Soviet Radio" publishers, Moscow, 1972), wherein a portion of the output signal power is fed to the input of the klystron in antiphase with the input signal. The operating speed provided by such a method equals several r-f oscillation periods, a value high enough as compared with the rise time of signals in radio sets. Another advantage of the foregoing method is a comparatively simple feedback circuit.
However, the process of enhancing phase-shift stability in the device is accompanied by corresponding decreases in the mu factor, a disadvantage associated with the fact that the feedback signal voltage is subtracted from the input signal voltage. The fuller the compensation of phase instability of the device, the higher will be the losses in the mu factor.
The known device for accomplishing the aforesaid method of adjusting a phase shift by employing negative feedback between the output and input of a klystron comprises a line for transmitting a signal from an output resonator to an input resonator of said klystron, a phase shifter for adjusting the phase of a signal applied to the input resonator and, if required, a filter for preventing self-oscillations at frequencies corresponding to positive feedback.
DISCLOSURE OF THE INVENTION
The invention resides in providing a method of adjusting a phase shift in an amplification multicavity klystron and a device therefor, which make it possible to prevent any change in a phase shift in a klystron in the case of anode voltage variations as small as a few percent without losses in the mu factor. The method is accomplished by employing two feedback channels.
The foregoing object is attained by providing a method of adjusting a phase shift in an amplification multicavity klystron involving the tapping of a portion
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Pasmannik Vitaly I.
Sakharov Viktor P.
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