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Direct down-conversion receivers at Ka band in GaAs and SiGe are measured and analysed with particular attention to linearity. The GaAs receiver is observed to have the superior overall linearity although SiGe has the better secondorder behaviour. The linearity is discussed with respect to the requirements of point-to-point radio and for the first time, to the authors' knowledge, an explanation is established for the effect of third-order distortion in the LNA on the second-order distortion from the complete receiver.

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A packaged up-converter has been developed for the ETSI 42 GHz point-to-point radio band. The MMIC contains an LO-doubler-buffer amplifier, an image-reject balanced mixer and an RF variable gain amplifier. The up-converter has 10 dB conversion gain, 15 dB image rejection, 15 dB of gain control, 15 dBm IIP3 and 50 dB LO-to-RF isolation in the mixer. The upconverter consumes less than 1 watt DC represents the state of the art in performance, integration and cost.