spectrum is a finite resource) necessitates highly spectrally efficient communications
standards that combine both amplitude-modulation (AM) and phase-modulation (PM). The
resulting complex modulation schemes require that the RF power amplifier (PA) be highly
linear to preserve the modulation and, hence, the transmitted data (in-band linearity) and
simultaneously avoid interfering with users of the rest of the spectrum (out-of-band linearity) …