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A 3.15-mW +16.0-dBm IIP3 22-dB CG Inductively Source Degenerated Balun-LNA Mixer With Integrated Transformer-Based Gate Inductor and IM2 Injection Technique


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Abstract


This article proposes two linearization techniques in improving the third-order input intercept point (IIP3) of a balun-low-noise amplifier (LNA) mixer. First, the intrinsic third-order intermodulation (IM3) product of the inductively source degenerated (ISD) transconductor from the second-order derivative transconductance component (g m) is reduced by tailoring toward the optimum biasing point at the moderateinversion region. Second, the generated IM3 current by the firstorder derivative transconductance (g m ) due to the interaction with the feedback component in the ISD transconductor is attenuated by second-harmonic injection via the bulk of the ISD transconductor. Furthermore, a transformer-based gate inductor and a transformer-based balun are applied to improve the input impedance matching and produce a balanced differential input signal. Measured results in 0.13-μm CMOS show a high IIP3 of +16 dBm and a conversion gain (CG) of 22 dB at 2.4 GHz. The double-sideband (DSB) noise figure (NF) is 7.2 dB, and the power consumption is 3.15 mW at 1.2 V.

KeyWords
Balun-low-noise amplifier (LNA) mixer, CMOS, high linearity, inductively source degeneration transconductor, low-power, second-order intermodulation (IM2) injection, thirdorder input intercept point (IIP3), Volterra series



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