Flip-Chip Packaging of In0.6Ga0.4As MHEMT Device on Low-Cost Organic Substrate for W-Band Applications

Abstract

A discrete low noise In0.6Ga0.4As MHEMT with 150 nm gate length was flip-chip assembled on the low-cost RO3210 organic substrate for wireless communication applications. The measured DC characteristics were very similar before and after flip-chip assembly. The flip-chip packaged MHEMT showed a high drain current density of 516 mA/mm and a maximum transconductance of 576 mS/mm at a VDS of 0.8 V. The insertion gain of the flip-chip packaged device was decayed less than 2 dB up to 100 GHz as compared to the data of bare die. Moreover, the measured minimum noise figure was less than 2 dB as measured at VDS of 0.7 V and VGS of -0.7 V in the frequency range from 20 to 64 GHz for the device after flip-chip assembly. The excellent performance of the flip-chip packaged MHEMT demonstrates the feasibility of using low cost organic substrate for high frequency applications up to W band.