A Variable Gain Multiband Shunt Feedback LNA for LTE

The future belongs to multiband bandwidth-on-demand mobile networks. Simply reconfigurable mobile devices will be the key to handle the increasing number of bands as well as the varying bandwidth requirements. The LNA constitutes the first block of the receiver chain and therefore has to implement the highest level of reconfigurability. A shunt feedback LNA has been designed that can be used for multiple frequency bands. The proposed LNA has two gain steps incorporating a wideband match of at least -10 dB. Below 2 GHz the minimum gain is above 26 dB and the noise figure is below 1.9 dB. Below 1 GHz the gain is above 30 dB and the noise figure is below 1.5 dB. The IIP3 in low gain mode is least 5.8 dBm. The results have been obtained using a current of 8.7mA from a 1.4V supply in a 90 nm CMOS technology.