Trade-off performance properties of pHEMT-based LNAs vs. temperature for VSAT applications

The optimum trade-off performance of an LNA for VSAT applications based on a commercial pHEMT series have been investigated vs. temperature, starting from a noisy model fitted to the measured devices's scattering parameters and noise figure values. As a result, it has been noted that with decreasing temperature from room value, the combined minimum noise figure-power gain (Fmin-Gass), reported on the microwave low-noise device's data sheets, doesn't represent a useful working condition for an optimum LNA design.