Design of a low noise amplifier for CDMA transceivers at 900 MHz in CMOS 0.35 μm

The demand for portable wireless communications systems was pushed by the expansion of personal and business wireless services. As a result, portable devices tend to become cheaper, smaller and lighter with long lasting batteries. Those tendencies increased the focus on the implementation of RF integrated circuits using CMOS technology, which is continuously under the speed evolution pressure of digital circuits. The high speed of CMOS circuits allows integrated solutions to RF implementations. The implementation of an RF IC is very important since it meets the needs of portable communication systems. This article describes the design of a low noise amplifier (LNA) that is used in RF transceivers, in a 0.35 μm CMOS process. The LNA is intended to be used in the receiver of a mobile CDMA station, working in the 824-894 MHz range, evaluated by the TIA/EIA/IS-98-A interim standard.