A novel EER transmitter using two-point delta-sigma modulation scheme for WLAN and 3G applications

A novel transmitter architecture is proposed for wireless local area networks (WLAN) and 3/sup rd/ generation (3G) mobile applications. The transmitter is based on the envelope elimination and restoration (EER) architecture applied with two-point delta-sigma modulator (TPDSM). It can integrate digital modulators and power amplifiers without mixers effectively. In addition, the power amplifier can deal with non-constant envelope modulations like QPSK highly efficiently.