Abstract
In this paper, a new CMOS variable gain low noise amplifier (VG LNA) with continuous gain variation for 2–11 GHz employing a resistance feedback current reuse stage and a cascode stage is presented. By controlling the transimpedance feedback resistor of the first stage and the bias current of the second stage, a continuous gain tuning range of 26 dB is achieved without influencing the input match and output match. The VG LNA is simulated based on the TSMC 0.18 μm CMOS process and shows the following performance at the highest gain mode: S11 is less than -10 dB from 3 to 10.2 GHz, and S22 is less than -18 dB from 2 to 11 GHz. In the total 2–11 GHz frequency range, the gain is more than 17 dB, and the noise figure is less than 3.8 dB, while drawing 7.57 mA from 1.4 V supply voltage.
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