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This paper reviews the main circuit strategies reported so far for the implementation of multi-standard low-noise amplifiers (LNAs) and presents a reconfigurable and adaptive LNA intended for beyond-3G RF hand-held devices. The circuit, designed and implemented in a 90-nm CMOS technology, combines a reduced number of inductors with PMOS-varactors and programmable load to adapt its performance to different standard specifications with optimized power consumption. As a case study, the LNA has been designed to cope with the requirements of four standards: GSM, WCDMA, Bluetooth (BT) and WLAN (IEEE 802.11b-g). Simulation results, including technology and packaging parasitics, demonstrate correct operation of the circuit for all the standards under study, featuring NF<2.8 dB, S21>13.3 dB and IIP3>10.9 dBm over a 1.85-2.48 GHz band, with an adaptive power consumption between 17.4 mW and 21.7 mW from a 1-V supply voltage.
Date of Conference: 24-27 May 2009