An inductorless wideband LNA with a new noise canceling technique


Abstract: An inductorless wideband low-noise amplifier (LNA) employing a new noise canceling technique for multistandard applications is presented. The main amplifier has a cascode common gate structure, which provides good input impedance matching and isolation. The proposed noise canceling technique not only improves the noise figure and power gain but also embeds a g$_{m}$-boosting technique in itself, which reduces the power consumption of the main amplifier. Using current-steering and current-reuse techniques in the noise canceling branch makes the design realizable and low power. The proposed LNA is simulated and optimized in 0.13 $\mu $m CMOS technology. The LNA achieves a noise figure of 2.8-3.4 dB, power gain of 19.2 dB, and input impedance matching better than -10.5 dB over bandwidth of 0.04-4.6 GHz. It consumes only 8.5 mW from 1.2 V supply voltage, which makes it a low power LNA.

Keywords: Current reuse technique, G$_{m}$-boosting technique, low power LNA, noise canceling technique

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