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An 85–115 GHz three-stage monolithic millimeter-wave integrated circuit (MMIC) amplifier based on 90-nm InAlAs/InGaAs/InP pseudomorphic high electron-mobility transistor (PHEMT) devices has been designed. The PHEMT (0.09×2×25um2)used in this design has a dc transconductance (gm) of 1640 mS/mm with ft =247 GHz and fmax=392 GHz. The monolithic three-stage amplifier demonstrates a small-signal gain of...
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