METHOD OF DETERMINATION OF EQUIVALENT NOISE TEMPERATURE OF INPUT OF AMPLIFIER Russian patent published in 1995 - IPC

FIELD: radio engineering. SUBSTANCE: levels P₁, P₂ and P_o of power of noise signal are measured within given bandwidth across output of measured amplifier matched by input, across output of reference source of noise signal with noise temperature T and across output of matched load at ambient temperature T_o. Ratio γ of difference of levels P₁ and P_o to difference of levels P₂and P_o is found. Then noise temperature T_n of amplifier is determined from expression , where α₁, α₂ are induced attenuations of path from output of measured amplifier and reference source of noise signal correspondingly to input of power meter of noise signal on measurement frequency T_n rel.units; K_g is gain factor of measured amplifier on measured frequency T_n rel.units. EFFECT: expanded functional capabilities with simultaneous increase of measurement precision of noise temperature of SHF amplifiers. 1 dwg