A new differential LNA topology for wireless applications

In this paper a new topology of differential low noise amplifier for wireless applications is presented. This solution allows a drastic area reduction, with respect to traditional emitter coupled topology, since it makes it possible to achieve integrated matching at the input by using only down-bond wiring. In this way no integrated inductors are needed. As shown by simulations, an increased linearity range can also be obtained, without impairing the noise figure. As an example of this new solution, a LNA has been designed for 2.44 GHz frequency operation. The main characteristics of this amplifier are: a noise figure of 1.56 dB, a voltage gain of 19.5 dB, an input impedance of 50 /spl Omega/, an input-referred 3/sup rd/ intercept point of -7.25 dBm and a dissipated power equal to 19 mW.