RF Transconductor Linearization Robust to Process, Voltage and Temperature Variations

Software-defined radio receivers increasingly exploit linear RF V-I conversion, instead of RF voltage gain, to improve interference robustness. Unfortunately, the linearity of CMOS inverters, which are often used to implement V-I conversion, is highly sensitive to Process, Voltage and Temperature variations. This paper proposes a more robust technique based on resistive degeneration. To mitigate third-order IM3 distortion induced by the quadratic MOSFET I-V characteristic, a new linearization technique is proposed which exploits a floating battery by-pass circuit and replica biasing to improve IIP3 in a robust way. This paper explains the concept and analyzes linearity improvement. To demonstrate operation, an LNTA with current domain mixer is implemented in a 45 nm CMOS process. Compared to a conventional inverter based LNTA with the same transconductance, it improves IIP3 from 2 dBm to a robust P IIP3 of 8 dBm at the cost of 67% increase in power consumption.

[1]  Ahmad Mirzaei,et al.  A blocker-tolerant wideband noise-cancelling receiver with a 2dB noise figure , 2012, 2012 IEEE International Solid-State Circuits Conference.

[2]  Eric A. M. Klumperink,et al.  Systematic comparison of HF CMOS transconductors , 2003, IEEE Trans. Circuits Syst. II Express Briefs.

[3]  B. Nauta,et al.  Wide-band CMOS low-noise amplifier exploiting thermal noise canceling , 2004, IEEE Journal of Solid-State Circuits.

[4]  Bram Nauta,et al.  A CMOS transconductance-C filter technique for very high frequencies , 1992 .

[5]  Xin He,et al.  A compact SAW-less multiband WCDMA/GPS receiver front-end with translational loop for input matching , 2011, 2011 IEEE International Solid-State Circuits Conference.

[6]  Ahmad Mirzaei,et al.  A Blocker-Tolerant, Noise-Cancelling Receiver Suitable for Wideband Wireless Applications , 2012, IEEE Journal of Solid-State Circuits.

[7]  Ahmad Mirzaei,et al.  Highly Integrated and Tunable RF Front Ends for Reconfigurable Multiband Transceivers: A Tutorial , 2011, IEEE Transactions on Circuits and Systems I: Regular Papers.

[8]  Eric A. M. Klumperink,et al.  Software defined radio receivers exploiting noise cancelling: A tutorial review , 2014, IEEE Communications Magazine.

[9]  Eric A. M. Klumperink,et al.  RF transconductor linearization technique robust to process, voltage and temperature variations , 2014, 2014 IEEE Asian Solid-State Circuits Conference (A-SSCC).

[10]  Jonathan Borremans,et al.  A 0.9V low-power 0.4–6GHz linear SDR receiver in 28nm CMOS , 2013, 2013 Symposium on VLSI Circuits.

[11]  W. Redman-White,et al.  1/f noise in passive CMOS mixers for low and zero IF integrated receivers , 2001, Proceedings of the 27th European Solid-State Circuits Conference.

[12]  Jonathan Borremans,et al.  A 0.9 V 0.4–6 GHz Harmonic Recombination SDR Receiver in 28 nm CMOS With HR3/HR5 and IIP2 Calibration , 2014, IEEE Journal of Solid-State Circuits.

[13]  Eric A. M. Klumperink,et al.  A software-defined radio receiver architecture robust to out-of-band interference , 2009, 2009 IEEE International Solid-State Circuits Conference - Digest of Technical Papers.

[14]  Willy Sansen,et al.  Distortion in elementary transistor circuits , 1999 .

[15]  Lu Han,et al.  A Single–Chip 10-Band WCDMA/HSDPA 4-Band GSM/EDGE SAW-less CMOS Receiver With DigRF 3G Interface and ${+}$90 dBm IIP2 , 2009, IEEE Journal of Solid-State Circuits.

[16]  B. Nauta,et al.  The Blixer, a Wideband Balun-LNA-I/Q-Mixer Topology , 2008, IEEE Journal of Solid-State Circuits.

[17]  Rinaldo Castello,et al.  A 15 mW, 70 kHz 1/f corner direct conversion CMOS receiver , 2003, Proceedings of the IEEE 2003 Custom Integrated Circuits Conference, 2003..

[18]  N. A. Moseley,et al.  Digitally Enhanced Software-Defined Radio Receiver Robust to Out-of-Band Interference , 2009, IEEE Journal of Solid-State Circuits.

[19]  Jaeyoung Choi,et al.  A Highly Linear 1 GHz 1.3 dB NF CMOS Low-Noise Amplifier With Complementary Transconductance Linearization , 2014, IEEE Journal of Solid-State Circuits.

[20]  Heng Zhang,et al.  Linearization Techniques for CMOS Low Noise Amplifiers: A Tutorial , 2011, IEEE Transactions on Circuits and Systems I: Regular Papers.

[21]  A.A. Abidi,et al.  The Path to the Software-Defined Radio Receiver , 2007, IEEE Journal of Solid-State Circuits.