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A 17.1-17.3-GHz image-reject downconverter with phase-tunable LO using 3× subharmonic injection locking

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3 Author(s)
Yue, S.Y. ; Synopsys Canada Inc., Mississauga, Ont., Canada ; Ma, D.K. ; Long, J.R.

A 17-GHz RF receiver, consisting of a low-noise amplifier (LNA) and doubly balanced mixers coupled by a monolithic 3.7:1 step-down transformer, realizes over 75 dB of image rejection in a production 100-GHz fT SiGe BiCMOS technology. A new coupling transformer winding improves the magnetic coupling coefficient by more than 20% compared to conventional designs, which reduces parasitic effects and increases the overall efficiency of the LNA/mixer combination. Quadrature LO signals with electronically tunable phase are generated by a subharmonically injection-locked oscillator. The measured receiver IIP3 is -5.1 dBm with 17.3-dB conversion gain and 6.5-dB noise figure (SSB 50 Ω) at 17.2 GHz. The 1.9×1.0 mm2 IC consumes 62.5 mW from a 2.2-V supply.

Published in:

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