A new investigation on low noise amplifiers for W-CDMA applications

A new approach on LNA design is presented. It consists in using simultaneously a series feedback and common source series feedback (CSSF). This is done by using a series resistance in the drain and a series inductance in the source of a PHEMT. Band-pass filters realized with 50 /spl Omega/ microstrip lines in the /spl Pi/ topology form were used to match both the input and the output. To examine the performance, the numerical results obtained with the approach are discussed and compared with two LNA's configurations.