Abstract: The efficiency of Radio Frequency Identification (RFID) readers and tags largely depend on the performance of Low Noise Amplifier (LNA). This study presents different types of LNA used in RFID tags. LNAs are mainly separated into two groups. The 1st group is the inductive LNA and the 2nd group is inductor-less LNA. Each group is discussed in detail. In the LNA design, there are very important factors that play vital role in LNA performance such as voltage gain, Noise Figure (NF), power consumption, chip size and cost. This study covers all different designs and the advantages and disadvantages of each design. The study presents an idea about the effective area and suitable application for various designs with some solutions.