Abstract
A high-gain InP MMIC cascode distributed amplifier was developed which has 12 dB of gain from 5 to 60 GHz with over 20-dB gain control capability and a noise figure of 2.5-4 dB in the Ka band. Lattice-matched InAlAs/InGaAs cascode HEMTs on InP substrate with 0.25- mu m gate length were the active devices. Microstrip was the transmission medium for this MMIC with an overall chip dimension of 2.3 mm*0.9 mm. The gain/noise figure advantages of the InP HEMT over the AlGaAs HEMT and the superior gain performance of the cascode HEMT over the common-source HEMT are demonstrated. >
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