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A linearization technique is proposed in which low-frequency second-order-intermodulation (IM2) is generated and injected to suppress the third-order intermodulation (IM3). The proposed linearization technique is applied to both a low-noise amplifier (LNA) and a down-conversion mixer in an RF receiver front-end (RFE) working at 900 MHz. Fabricated in a 0.18 mum CMOS process and operated at 1.5 V supply with a total current of 13.1 mA, the RFE delivers 22 dB gain with 5.3 dB noise figure (NF). The linearization technique achieves around 20 dB IM3 suppression and improves the RFE's IIP3 from -10.4 dBm to 0.2 dBm without gain reduction and noise penalty while requiring only an extra current of 0.1 mA.
Date of Publication: Nov. 2008