High efficiency LTE transmitter considering a polar PWM architecture and RF front-end blocks

This paper presents validation of a high efficiency multi-radio transmitter applied to the LTE transmission features. Our design takes into account the influence of RF components, such as frequency synthesizer, switched-mode power amplifier and RF band-pass filter. Architecture of the transmitter is based on the Envelope Elimination and Restoration (EER) principle and uses a Pulse Width Modulator (PWM) to code the envelope of the modulated signal. It is demonstrated, that this architecture can offer power added efficiency of up to 72%, when considering the E-UTRA band number 1 operations with a 10 MHz channel and QPSK modulated signal. The obtained Error Vector Magnitude (EVM) is less than 8.5% and the output signal respects the power mask given by the standard.