A Ku-Band 3.3-V LNA With Multicoupled Q-Enhancement Transformer and Current-Reuse Techniques in 65-nm CMOS
Ting Huang, Xiangyu Meng, C.H. Chen, Baoyong Chi
Abstract
This letter presents a Ku-band 3.3-V low-noise amplifier (LNA) with a multicoupled transformer using current-reuse techniques. The multicoupled transformer combines a shunt resonator and a series resonator forming multiple resonant frequencies. Furthermore, the topology enhances the equivalent <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula> factor of the inductors for input matching and reduces the noise factors. Wideband input matching and noise matching are realized simultaneously. Fabricated in a 65-nm CMOS process, the LNA achieves a 1.58–2.63-dB NF and a 29.6-dB power gain from 9.5 to 13.5 GHz with a 1.5-dB ripple. The LNA consumes 20 mW from a 3.3-V supply and occupies an area of 0.39 mm2.