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Radio frequency power amplifiers operate most efficiently in the compression region and become less efficient as signal peak-to-average power ratio increases. This is due to the amplifier spending more time operating below peak power and, thus operating below its maximum efficiency. However, the use of the envelope tracking technique can dramatically increase the efficiency of RF transmitters. In...
Performance of Crest Factor Reduction (CFR) technique based on peak windowing scheme along with Digital Predistortion (DPD) technique using Generalized Memory Polynomial (GMPDPD) is studied, and its effect on the performance of power amplifier (PA) is reported. Experimental results show that at system level the CFR techniques can reasonably reduce the peak to average power ratio (PAPR) of the input...
This paper reports a dual band predistortion linearization technique for an envelope modulator based transmitter operated in concurrent multi-band, multi-standard mode driven by 20 MHz bandwidth LTE and 4 carrier 20 MHz bandwidth WCDMA signals. To reduce the speed of the composite envelope path, a bandwidth reduced combined envelope signal is used for the dynamic supply of the dual-band PA. Measurement...
In this paper, an experimental approach is proposed to accurately identify, under a modulated signal drive, the memoryless nonlinearity of power amplifiers exhibiting memory effects. It is experimentally demonstrated that, when they are present, memory effects bias the extracted static nonlinearity. Accordingly, the sampling rate of the WCDMA test signal waveform is varied to reduce the signal’s bandwidth...
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