Abstract
A post-linearization technique for the differrential CMOS LNA is presented. The proposed method uses an additional cross-coupled common-source FET pair to cancel out the third-order intermodulation (IM₃) current of the main differential amplifier. This technique is applied to enhance the linearity of CMOS LNA using 0.18-㎛ technology. The LNA achieved +10.2 ㏈m IIP3 with 13.7 ㏈ gain and 1.68 ㏈ NF at 2 ㎓ consuming 11.8 ㎃ from a 1.8-V supply. It shows IIP3 improvement by 6.6 ㏈ over the conventional cascode LNA without the linearizing circuit.
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