... Melbourne, Australia, May 2006 [3] A Diet, C Berland, M Villegas, and G Baudoin, “EER architecture specifications for OFDM transmitter using a class E amplifier,” IEEE Microwave and Wireless Components ... digital generation of the amplifier’s RF drive signal is now possible Figure 1(top) shows the traditional wireless base station architecture and a proposed architecture (Figure 1(bottom)) for a future ... Cartesian ΣΔ clearly outperforms the polar ΣΔ, leading to a lower n requirement for the same ACP The results shown here for n = are reasonable for the WLAN standard (ACP < −40 dB) However a higher...