Comments on "Sinlultaneous determination of transistor noise, gain, and scattering parameters for amplifier design through noise figure measurements only"

It is noted that in the above named work (see ibid., vol.IM-35, p.89-91, March 1985) expression (4) appears to be correct only if the physical temperature T_a of an isolator is equal to the standard temperature T₀=290K. The correct expression for the case T_a≠T_O=290K is given. In replying, the original authors note that the correction does not affect noise characterization of transistors at room temperature (T_a≡297K≡T_O=290K). A more complete relationship for F´(S´₂₂) is also noted.