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A +10-dBm IIP3 SiGe mixer with IM3 cancellation technique

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4 Author(s)
S. Otaka ; Corp. R&D Center, Kawasaki, Japan ; M. Ashida ; M. Ishii ; T. Itakura

A third-order intermodulation (IM3) cancellation technique using a submixer is proposed for a low-power low-distortion mixer. The IM3 cancellation is achieved by summing IM3 generated in a main mixer and the submixer, which are almost the same amplitude and opposite phase. The mixer was designed to operate at 870 MHz. The proposed technique reduces IM3 by 18 dB with a current increase of about 15% and is suitable for low-power applications. The mixer achieved an input-referred third-order intercept point (IIP3) of 10 dBm, a gain of 8.7 dB, and an NF of 9.8 dB and dissipates 30 mW from 2.9 V. The IC is fabricated in a SiGe bipolar transistor with fT= 30 GHz. The IC occupies 1.44 mm×1.44 mm.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:39 ,  Issue: 12 )