A compact coplanar W-band variable gain amplifier MMIC with wide control range using dual-gate HEMTs

A W-band variable gain amplifies MMIC with 37 dB gain at 94 GHz and a gain control range of over 70 dB has been developed. The circuit consists of four dual-gate HEMT stages, using a 0.15 /spl mu/m AlGaAs-InGaAs-GaAs PM-HEMT technology. The chip was realized in coplanar technology and requires an area of only 1/spl times/3 mm/sup 2/. The resulting power gain density is 12 dB/mm/sup 2/ at 94 GHz.