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-This paper is intended to give an insight in the development of PHEMT multifunction MMICs (MFC) in the millimetre wave frequency range. It applies to the fast growing Local Multipoint Distribution System (LMDS) market, offering a two-chip solution for the subscriber transceivers. The focus is on the up and down converter dedicated to the Customer Premise Equipment (CPE) at 28GHz. These two chips include a sub-harmonic mixer, a buffer amplifier for the local oscillator and a low noise amplifier used either as a LNA (for Rx) or transmit driver (for Tx). The design was oriented toward low chip-size in order to being able to reach the cost requirement for such systems. Results are shown from a demonstrator assembly built with these two MMICs MFCs.

Using conventional 0.25pm HEMT (VLN02 process) and pseudomorphic 0.15pm HEMT (MM015 process), a highly integrated and low power consumption receiver has been developed for a W-band radiometer. All the millimeterwave functions and even the first stage of IF amplifier are fully integrated on MMIC technology according to a multifunction approach. A compact housing has been developed for chip integration. A high performance oscillator at LO sub-harmonic provides less than -93dBc/Hz at lOOliHz from carrier at 46.6GHz. The complete frontsnd assembly exhibits more than 20dB conversion gain and less than 6.5dB noise figure around 93.5GHz RF frequency and 100 to 600MHz associated IF frequency. To our knowledge this realization is the first report of a fully monolithic W-band complete front-end based on industrial HEMT technologies and dedicated to space applications.

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