Title :
Analysis and Design of a CMOS UWB LNA With Dual-
-Branch Wideband Input Matching Network
Author :
Lin, Yo-Sheng ; Chen, Chang-Zhi ; Yang, Hong-Yu ; Chen, Chi-Chen ; Lee, Jen-How ; Huang, Guo-Wei ; Lu, Shey-Shi
Author_Institution :
Dept. of Electr. Eng., Nat. Chi Nan Univ., Puli, Taiwan
Abstract :
A wideband low-noise amplifier (LNA) based on the current-reused cascade configuration is proposed. The wideband input-impedance matching was achieved by taking advantage of the resistive shunt-shunt feedback in conjunction with a parallel LC load to make the input network equivalent to two parallel RLC-branches, i.e., a second-order wideband bandpass filter. Besides, both the inductive series- and shunt-peaking techniques are used for bandwidth extension. Theoretical analysis shows that both the frequency response of input matching and noise figure (NF) can be described by second-order functions with quality factors as parameters. The CMOS ultra-wideband LNA dissipates 10.34-mW power and achieves S 11 below -8.6 dB, S 22 below -10 dB, S 12 below -26 dB, flat S 21 of 12.26 ?? 0.63 dB, and flat NF of 4.24 ?? 0.5 dB over the 3.1-10.6-GHz band of interest. Besides, good phase linearity property (group-delay variation is only ??22 ps across the whole band) is also achieved. The analytical, simulated, and measured results agree well with one another.
Keywords :
CMOS integrated circuits; RLC circuits; circuit feedback; frequency response; impedance matching; low noise amplifiers; ultra wideband communication; CMOS UWB LNA; bandwidth extension; current-reused cascade configuration; dual-RLC-branch wideband input matching network; frequency 3.1 GHz to 10.6 GHz; frequency response; inductive series; noise figure; parallel LC load; phase linearity; power 10.34 mW; resistive shunt-shunt feedback; second-order functions; shunt peaking; wideband input-impedance matching; wideband low-noise amplifier; LC load; CMOS; inductive peaking; low-noise amplifier (LNA); quality factor ($Q$ factor); resistive feedback; ultra-wideband (UWB);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2009.2037863