An impedance modulated class-E polar amplifier in 90 nm CMOS

@article{Ingels2011AnIM,
  title={An impedance modulated class-E polar amplifier in 90 nm CMOS},
  author={Mark Ingels and Vincenzo Chironi and Bj{\"o}rn Debaillie and Andrea Baschirotto and Jan Craninckx},
  journal={IEEE Asian Solid-State Circuits Conference 2011},
  year={2011},
  pages={285-288}
}
This paper presents a digital amplitude modulator for a polar transmitter. The instantaneous output power is modulated by adjusting the amplifier's load through a digitally controlled impedance transformation network. The modulator is suited for modulation schemes with moderate peak-to-average power ratio (PAPR), such as π/4 DQPSK The modulator may also be used for fine gain control in constant envelope modulation schemes. A class E amplifier with digital impedance amplitude modulation is… CONTINUE READING

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