A Wideband Differential Low-Noise-Amplifier With IM3 Harmonics and Noise Canceling

Abstract

This letter presents a wideband 2-stage differential LNA which utilizes the canceling techniques of IM3 harmonic distortion and noise. The 1st stage adopts a gm-boosted cross-coupled push-pull amplifier to achieve an input matching and reduce the NF. The 2nd stage simultaneously cancels the IM3 and thermal noise of the transistors in the 1st stage. The LNA has a gain of 16 similar to 18 dB in a wide bandwidth of 0.1 similar to 2.5 GHz, while consuming 13 mW from a 1.2 V power supply. The NF is 1.7 similar to 2.7 dB and IIP3/IIP2 are -3 similar to 0/18 similar to 21.5 dBm, respectively. The LNA is fabricated in 65 nm digital CMOS technology and the chip area is 0.008 mm(2).