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Common-Gate Load-Pull With Q-Band Application

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3 Author(s)
Simon J. Mahon ; Sydney Design Centre, Macom Technology Solutions, North Sydney, Australia ; Alan C. Young ; Anthony E. Parker

A new technique is proposed for the design of linear power amplifiers at millimeter-wave frequencies where load-pull of large transistor output cells is difficult. The technique transforms the load-pull data on a small, standard foundry transistor layout to a pair of common-gate contours for the intrinsic device; one source-gate and one drain-gate. These are recombined as an intrinsic drain-source contour for a larger and arbitrary transistor layout. A Q-band driver amplifier for the ETSI 42-GHz point-to-point radio band has been designed using the proposed technique. The fabricated MMIC consumes 1 W and has a gain of 21 dB, with OIP3 of 35 dBm, OIP5 of 28 dBm and P1 dB of 23 dBm. The PAE is approximately 19%. The OIP3 to P1 dB and OIP3 to dc power ratios are believed to be the best reported to date.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:47 ,  Issue: 10 )