W-band InP based HEMT MMIC low noise amplifiers

InP HEMTs have very high gain, low noise figure in millimeter wave frequency range. W-band low noise amplifier is a key component of next generation satellite communication systems, wireless LAN, and radio telescope receivers [ 11. Some W-band low noise amplifiers developed on GaAs based HEMT [2]-[4] and InP based HEMT [5]-[7] were reported previously. The InP low noise amplifiers demonstrated better gain and noise figure performances. This paper presents two InP HEMT MMIC low noise amplifiers for W-band radio telescope receiver applications. The measured peak gain of the three-stage amplifier is 14.5 dB at 102 GHz, and the room-temperature noise figure is between 2.9 and 4.5 dB from 90 to 98 GHz. The four-stage amplifier has 20-dB measured gain from 85 to 105 GHz with a 22.5-dB peak gain at 93 GHz.