TITLE:
An Analytical Approach for Fast Automatic Sizing of Narrow-Band RF CMOS LNAs
AUTHORS:
Jin Young Choi
KEYWORDS:
Automatic Synthesis; Analytical Approach; CMOS LNA; Narrow Band; Cascode
JOURNAL NAME:
Circuits and Systems,
Vol.3 No.2,
April
19,
2012
ABSTRACT: We introduce a fast automatic sizing algorithm for a single-ended narrow-band CMOS cascode LNA adopting an inductive source degeneration based on an analytical approach without any optimization procedure. Analytical expressions for principle parameters are derived based on an ac equivalent circuit. Based on the analytical expressions and the power-constrained noise optimization criteria, the automatic sizing algorithm is developed. The algorithm is coded using Matlab, which is shown capable of providing a set of design variable values within seconds. One-time Spectre simulations assuming usage of a commercial 90 nm CMOS process are performed to confirm that the algorithm can provide the aimed first-cut design with a reasonable accuracy for the frequency ranging up to 5 GHz. This work shows one way how accurate automatic synthesis can be done in an analytical approach.