The invention provides a digital-analog combined
gain temperature compensating circuit for a travelling-
wave tube amplifier. The circuit comprises a temperature-measuring circuit, an analog temperature compensating circuit, and a digital temperature compensating circuit, digital-analog combined
gain temperature compensation for the travelling-
wave tube amplifier can be realized, wherein the analog temperature compensating circuit can realize coarse temperature compensation via the adjustment of an adjustable
resistor, the digital temperature compensating circuit obtains a digital temperature compensating
voltage corresponding to an output
voltage of the temperature-measuring circuit via a set look up table (LUT) so that
fine tuning of temperature compensation is realized, the defects that by individually employing analog temperature compensation or digital compensation, the debugging quantity is large, self excitation easily occurs within a temperature range, the margin of temperature compensation is not sufficient, and the compensation match is poor are overcome, the realization mode of the circuit is simple, the requirements of
miniaturization and low
power consumption of space-borne products can be met, the compensation precision is high, and the margin is wide.