Abstract
This paper presents the development of an 85-120 GHz high-gain and wide-band monolithic millimeter-wave integrated circuit (MMIC) amplifier using our own improved 70-nm InP pseudomorphic high electron mobility transistor (PHEMT) with ft=247 GHz and fmax=392 GHz. Edge-coupled line is used for DC blocking and radial subs are employed for RF bypass. Shunt RC networks and radial stubs are included in the bias circuitry to maintain amplifier stability. This amplifier is measured on-wafer with a small-signal peak gain of 14.4 dB at 92 GHz and greater than 11.5 dB from 85 to 120 GHz. The 3dB bandwidth is above 35 GHz with a chip size of 1.6×1.1 mm2. To our knowledge, this MMIC amplifier has characteristics of much higher-gain per stage, wider-band and smaller chip size than others at the similar frequency band. The excellent results indicate that this MMIC amplifier has a great potential for pre-amplifier or interstage driving amplifiers applications at W-band or D-band.
