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In this paper the design of a fully integrated fast switchable cascode low noise amplifier (LNA) for application in wireless wake-up receivers is presented. The circuit contains an integrated balun and a transformer for 50 Ω-input-matching. The LNA exhibits a voltage gain of 20 dB while only consuming an overall current of 750 µA in its on-mode from a 2.5 V supply. The measured input return loss is -18 dB at 2.4 GHz with a corresponding noise figure of 3.3 dB. This amplifier exhibits a third order intermodulation input intercept point of -8 dBm.To enable the operation within an on-time of 200 ns the LNA is able to settle in less than 32 ns until the output obtains -1 dB of its steady state amplitude. The chip size is 0.21 mm 2 excluding the pads. All parameters are verified with measurements of the proposed LNA fabricated in IHP 130 nm-SiGe-BiCMOS process.

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