Abstract
A capacitive feedback circuit along with a pi-matching network is proposed to achieve the input matching condition without gain trade-off for the common-source low noise amplifier (CSLNA). The pi-matching network introduces an additional degree of design freedom and allows the LNA to achieve high gain. Designed for the 2.4 GHz ISM band, the proposed LNA achieves a measured gain of 21.5 dB with an S-11 of -12 dB while consuming only 0.6 mW. The NF is 4.9 dB and the IIP3 is -12 dBm.