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This paper presents a low noise amplifier (LNA) with high-Q inductors in a wafer-level chip-scale package (WL-CSP) process. Q-factor of inductors has big impacts on characteristics of LNAs, thus we investigate availability of WL-CSP high-Q inductors. A common-source LNA with inductive degeneration is used for discussion. The 5.2 GHz LNA with WL-CSP inductors provides a noise figure of 1.7 dB which is 1.5 dB smaller than that with on-chip inductors.
Date of Conference: 9-11 Dec. 2007