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A Ka-band high power, single power supply SSPA using mm wave power PHEMT process has been successfully developed for LMDS (Local Multi-point Distribution System) application.Operated under 5V single power supply, this four stage amplifier has 23dB of linear gain and typical 33 dBm (2W) of 1dB gain compression power for the entire 900 MHz bandwidth (27.5 -28.4 GHz). This amplifier is designed to meet the demanding hub station linearity requirement of DAVIC specification for grade A QPSK modulation of data and video transmission. When operated at 30dBm (1W) power output with single channel band limited signal, the spectral re-growth is -35dBc, 3dB better than the -32dBc performance target. To our knowledge, the linearity performance presented is the best reported so far for this application.

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