US 4,733,192 A · Amplifying arrangements including a klystron having a power transfer characteristic which is substantially the same over its entire passband

Abstract

Klystrons are inherently non-linear and have an amplification characteristic which is frequency dependent on both signal amplitude and beam current. This may be compensated for by applying suitable correcting signals to a beam controlling electrode of the klystron thereby changing its electron beam current over the whole excursion of a modulating signal. A klystron arrangement in accordance with the invention is particularly suitable for use in a television transmitter, enabling full time modulation to be carried out with a significant improvement in the operating efficiency of the klystron.

Claims10

Dependent claims

An amplifying arrangement including

a klystron having an interaction cavity and a power transfer characteristic, an interaction cavity and a beam controlling electrode, said beam controlling electrode having a potential applied thereto;
means for applying a high frequency carrier modulated with a modulating signal to said interaction cavity;
and
means for controlling the potential of said beam controlling electrode in dependence on the modulating signal, whereby the klystron power transfer characteristic is made substantially the same at substantially all frequencies over a desired passband of the klystron.

1 more element

Dependencies are inferred from the claim text.

Amplifying arrangements including a klystron having a power transfer characteristic which is substantially the same over its entire passband

Life of this patent

Amplifying arrangements including a klystron having a power transfer characteristic which is substantially the same over its entire passband

Life of this patent

Abstract

Claims10