Abstract
An ultra-low-power common-gate low noise amplifier (CG-LNA) for 2.4 GHz wireless sensor network (WSN) applications is proposed in this letter. The current-reuse and active <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$g_{\rm m}$</tex></formula> -boosting techniques are utilized. The analysis, design method and measurement results are shown. An implemented prototype using 0.18 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\mu$</tex></formula> m CMOS technology is evaluated using on-wafer probing. Measurements also show a gain of 14.7 dB and an <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\rm IIP}_{3}$</tex> </formula> of 2 dBm at 2.44 GHz. The measured noise figure is 4.8 dB at 2.44 GHz. <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\rm S}_{11}$</tex></formula> is below <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${-}18$</tex></formula> dB from 2–3 GHz. The proposed LNA consumes 0.58 mW from 1.8 V dc supply.
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