This paper presents a new method of reactive-combiner structure to be used as part of a multiphase digital pulsewidth modulated polar transmitter (DPWMPT). It overcomes the limitations of previous implementations of the multiphase pulse-modulated polar transmitter related to terminating pulsewidth modulation (PWM) harmonics located outside the passband, thereby improving both PWM harmonic suppression by using multiphase aliasing-free digital PWM technique and increasing overall efficiency by using reactive combining. For validation, a prototype transmitter was implemented and tested with a 64-QAM 20-MHz bandwidth long-term evolution (LTE) downlink signal with a 7.5-dB peak-to-average power ratio at 2140 MHz. The prototype dual-phase DPWMPT architecture achieved an output power level of 37 dBm and power-added efficiency of 33.5% while passing the stringent spectral requirements of the LTE standard for small-cell base stations using only simply memoryless predistortion correction.

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reactivecombiner structure 75db peaktoaverage power ratio 64qam 20mhz bandwidth longterm evolution lte downlink signal reactive combining terminating pulsewidth modulation pwm harmonics aliasingfree digital pwm technique memoryless predistortion correction pwm harmonic suppression passband poweradded efficiency multiphase digital pulsewidth modulated polar transmitter base stations dualphase dpwmpt architecture output power level

Chun-Wei ChangJau-Horng ChenJoseph Staudinger,.A Multiphase Digital Pulsewidth Modulated Polar Transmitter Architecture With Reactive Combiner for Improved Efficiency. 67 (3),1107-1114.

Chun-Wei ChangJau-Horng ChenJoseph Staudinger,"A Multiphase Digital Pulsewidth Modulated Polar Transmitter Architecture With Reactive Combiner for Improved Efficiency" 67

Chun-Wei ChangJau-Horng ChenJoseph Staudinger,"A Multiphase Digital Pulsewidth Modulated Polar Transmitter Architecture With Reactive Combiner for Improved Efficiency"