A flip-chip packaged 80-nm In0.7Ga0.3As MHEMT for millimeter-wave low-noise applications

In this paper, we present a flip-chip 80-nm In"0"."7Ga"0"."3As MHEMT device on an alumina (Al"2O"3) substrate with very little decay on device RF performance up to 60GHz. After package, the device exhibited high I"D"S=435mA/mm at V"D"S=1.5V, high g"m=930mS/mm at V"D"S=1.3V, the measured gain was 7.5dB and the minimum noise figure (NF"m"i"n) was 2.5dB at 60GHz. As compared to the bare chip, the packaged device exhibited very small degradation in performance. The result shows that with proper design of the matching circuits and packaging materials, the flip-chip technology can be used for discrete low noise FET package up to millimeter-wave range.