Temperature-dependent small-signal and noise parameter measurements and modeling on InPHEMTs

In this paper, we present detailed on-wafer S-parameter and noise parameter measurements and modeling of InP/InAlAs/InGaAs high electron mobility tran sistors (0.1-mum gate length) at cryogenic temperatures, Various physical e ffects influencing small-signal parameters, especially the radio-frequency (RF) transconductance and RF output resistance and their temperature depend ence, are discussed in detail. Accurate on-wafer noise parameter measuremen ts are carried out from 300 to 18 K, and the variation of the equivalent no ise temperatures of drain and source (T-d and T-g) are modeled against temp erature. Based on these models, a cryogenic low-noise amplifier in the Ka-b and is developed with a record-low noise temperature of 10 K.