1-Watt Ka-band coplanar high power MMIC amplifiers using 0.15-/spl mu/m GaAs PHEMTs

Two compact coplanar MMIC amplifiers having high output power at Ka-band are presented. Based on our 0.15-/spl mu/m GaAs PHEMT process on 4" wafers, a two-stage MMIC driver amplifier has demonstrated at 35 GHz, a linear gain of 11 dB, an output power at 1 dB gain compression P/sub -1dB/ of 350 mW, and a saturated output power P/sub sat/ greater than 500 mW. At the same frequency, the coplanar high power amplifier achieved a linear gain of 9.5 dB, with P/sub -1dB/=725 mW and more than 1 Watt of saturated output power. To our knowledge, this is the highest output power ever reported at Ka-band for any coplanar MMICs.