Wideband RF frontend design for flexible radio receiver

A wideband RF frontend for flexible radio applications is presented. A target is the performance adequate for multistandard 3G/ 4G systems operating in frequency range 0.8–6 GHz. Because of relaxed requirements on band select filters, more demands are placed on linearity while the necessary noise performance is assured. We discuss architecture with Low Noise Transconductance Amplifier (LNTA) and a passive mixer terminated by a low impedance load. One variant of it is a Miller integrator where its input impedance is upconverted by the mixer and provides partial attenuation for blockers at RF. We also investigate a variant with a capacitive load followed by a high impedance transconductance amplifier (TCA). In either variant there is a tradeoff between the frontend NF and IP3, and also between NF and the blocker attenuation. Optimization of the 65 nm CMOS frontend is attained by careful sizing of the mixer switches. The frontend simulation results show NF < 3 dB, IIP3 > +4 dBm and blocker attenuation > 20 dB. Finally, we also discuss the demands placed on the A/D converter resolution in terms of the frontend and the receiver overall NF.

[1]  O. Moreira-Tamayo,et al.  All-digital TX frequency synthesizer and discrete-time receiver for Bluetooth radio in 130-nm CMOS , 2004, IEEE Journal of Solid-State Circuits.

[2]  Qizheng Gu,et al.  RF System Design of Transceivers for Wireless Communications , 2005 .

[3]  Juha Kostamovaara,et al.  A low noise quadrature subsampling mixer , 2001, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196).

[4]  Jonathan Borremans,et al.  A 40nm CMOS highly linear 0.4-to-6GHz receiver resilient to 0dBm out-of-band blockers , 2011, 2011 IEEE International Solid-State Circuits Conference.

[5]  Quoc-Tai Duong,et al.  Low noise transconductance amplifier design for continuous-time ΣΔ wideband frontend , 2011, 2011 20th European Conference on Circuit Theory and Design (ECCTD).

[6]  F. Svelto,et al.  Toward multistandard mobile terminals - fully integrated receivers requirements and architectures , 2005, IEEE Transactions on Microwave Theory and Techniques.

[7]  Gabor C. Temes,et al.  Analog MOS integrated circuits , 1988 .

[8]  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..

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

[10]  Minjae Lee,et al.  An 800-MHz–6-GHz Software-Defined Wireless Receiver in 90-nm CMOS , 2006, IEEE Journal of Solid-State Circuits.