Analysis and Design of Configurable LNAs in

A unified description of multiple feedback common- gate low-noise amplifiers (LNAs) is presented, providing analyt- ical expressions for gain, noise figure, linearity, and stability con- ditions. Moreover, from the theory, a new methodology for LNA optimization is developed. This new approach, called adaptive op- timization, uses the ability to reconfigure the feedback network to match the amplifier characteristics to the changing working condi- tions. Results of simulation of LNAs with different feedback types are shown, and they confirm the theory presented. Index Terms—Common gate, feedback amplifier, high linearity, low-noise amplifier (LNA), multiband, multistandard, negative feedback, positive feedback, reconfigurability.

[1]  Antonio Liscidini,et al.  A 0.13 /spl mu/m CMOS front-end, for DCS1800/UMTS/802.11b-g with multiband positive feedback low-noise amplifier , 2006, IEEE Journal of Solid-State Circuits.

[2]  S. Cipriani,et al.  A fully integrated zero-IF transceiver for GSM-GPRS quad band application , 2003, 2003 IEEE International Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC..

[3]  F. Svelto,et al.  A variable gain RF front-end, based on a Voltage-Voltage feedback LNA, for multistandard applications , 2005, IEEE Journal of Solid-State Circuits.

[4]  X Li,et al.  Gm-boosted common-gate LNA and differential colpitts VCO/QVCO in 0.18-μm CMOS , 2005 .

[5]  Hossein Hashemi,et al.  Concurrent multiband low-noise amplifiers-theory, design, and applications , 2002 .

[6]  F. Svelto,et al.  A 0.18-$muhbox m$CMOS Selective Receiver Front-End for UWB Applications , 2006, IEEE Journal of Solid-State Circuits.

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

[8]  T.H. Lee,et al.  A 1.5 V, 1.5 GHz CMOS low noise amplifier , 1996, 1996 Symposium on VLSI Circuits. Digest of Technical Papers.

[9]  R. Blackman.  Effect of feedback on impedance , 1943 .

[10]  Paul J. Hurst,et al.  A comparison of two approaches to feedback circuit analysis , 1992 .

[11]  Stephen H. Lewis,et al.  Determination of stability using return ratios in balanced fully differential feedback circuits , 1995 .

[12]  H. W. Bode,et al.  Network analysis and feedback amplifier design , 1945 .

[13]  V. Srinivasa Somayazulu,et al.  Ultrawideband radio design: the promise of high-speed, short-range wireless connectivity , 2004, Proceedings of the IEEE.

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