A 1.8-V wide-band CMOS LNA for multiband multistandard front-end receiver

A balanced wide-band CMOS LNA with 18-26 dB gain, higher than +1.5 dBm IIP/sub 3/ and +20 dBm IIP/sub 2/, and less than 4.6 dB NF is achieved in the 900-MHz, 1.8-GHz and 2.4GHz-band by applying a dual-loop feedback. Measurement results show that the circuit works from DC to a frequency higher than 2.5 GHz (limited by the frequency range of the balun) with S/sub 11/ better than -15 dB. Simulation results show that the circuit has 15 dB gain and 5 dB NF at 5.2 GHz. The LNA consumes 20 mA from 1.8-V voltage-supply. As the output DC level is low, a stacked double balanced switching mixer on the output completes a front-end circuit for wireless receivers without consuming more current. The circuit is implemented in a 0.18/spl mu/m RF-CMOS technology with a die area of 0.4 /spl times/ 0.34 mm/sup 2/. This circuit is suitable for low-cost multiband multistandard front-end receivers.

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