Digitally-Enhanced Software-Defined Radio Receiver Robust to Out-of-Band Interference

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Ru, Zhiyu and Moseley, Niels A. and Klumperink, Eric A.M. and Nauta, Bram (2009) Digitally-Enhanced Software-Defined Radio Receiver Robust to Out-of-Band Interference. IEEE Journal of Solid-State Circuits, 44 (12). pp. 3359-3375. ISSN 0018-9200

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Abstract:Abstract—A software-defined radio (SDR) receiver with improved robustness to out-of-band interference (OBI) is presented. Two main challenges are identified for an OBI-robust SDR receiver: out-of-band nonlinearity and harmonic mixing. Voltage gain at RF is avoided, and instead realized at baseband in combination with low-pass filtering to mitigate blockers and improve out-of-band IIP3. Two alternative “iterative” harmonic-rejection (HR) techniques are presented to achieve high HR robust to mismatch: a) an analog two-stage polyphase HR concept, which enhances the HR to more than 60 dB; b) a digital adaptive interference cancelling (AIC) technique, which can suppress one dominating harmonic by at least 80 dB. An accurate multiphase clock generator is presented for a mismatch-robust HR. A proof-of-concept receiver is implemented in 65 nm CMOS. Measurements show 34 dB gain, 4 dB NF, and 3.5 dBm in-band IIP3 while the out-of-band IIP3 is + 16 dBm without fine tuning. The measured RF bandwidth is up to 6 GHz and the 8-phase LO works up to 0.9 GHz (master clock up to 7.2 GHz). At 0.8 GHz LO, the analog two-stage polyphase HR achieves a second to sixth order HR > dB over 40 chips, while the digital AIC technique achieves HR > 80 dB for the dominating harmonic. The total power consumption is 50 mA from a 1.2 V supply.
Item Type:Article
Additional information:Special Issue on the 2009 IEEE International Solid-State Circuits Conference, ISSCC in San Francisco, CA, February 2009
Copyright:© 2009 IEEE
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/69829
Official URL:http://dx.doi.org/10.1109/JSSC.2009.2032272
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