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 µ 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 0.04-4.6GHz. It consumes only 8.5 mW from 1.2 V supply voltage, which makes it a low power LNA.