A monolithic W-band preamplified diode detector

A monolithic W-band preamplified diode detector based on 0.1- mu m pseudomorphic AlGaAs-InGaAs-GaAs high-electron-mobility-transistor (HEMT) technology is discussed. This chip, consisting of a Schottky diode detector with a two-stage W-band low-noise amplifier (LNA), has a measured detector responsivity of 300 V/mW at 94 GHz and a tangential sensitivity of -62 dBm. This is the first reported monolithic preamplified diode detector at this frequency. A higher sensitivity preamplified detector which was built by cascading two monolithic three-stage W-band LNAs with the preamplified detector chip also shows a tangential sensitivity of -85 dBm. This monolithic chip is ideal for insertion into W-band radiometer and passive imaging array systems.<
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