Abstract
This paper is on the design and analysis of the five types of inductively-degenerated cascode LNA topologies. The topologies are Simultaneous Noise and Input Matching (SNIM), Power-constrained Simultaneous Noise and Input Matching (PCSNIM), Current-reuse (CR), Folded-cascode (FC) and PCSNIM with output buffer. For each topology, the functionality and design are discussed. Equations are given to enable better understanding on how the circuits perform. The characteristics that distinguish one topology from the others are highlighted. These LNAs were simulated using Silterra’s 0.18 μm CMOS technology and the designs were based on a common current consumption of 4 mA to enable comparative analysis. The results obtained conformed to the theories presented. The performances of the LNAs are within the desired range and in accordance to the W-CDMA requirement.
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