Improved EER transmitters for WLAN

Creative Commons License

NESİMOĞLU T., Morris K., Parker S., McGeehan J.

IEEE Radio and Wireless Symposium (RWS), California, Amerika Birleşik Devletleri, 17 - 19 Ocak 2006, ss.239-242, (Tam Metin Bildiri) identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1109/rws.2006.1615139
  • Basıldığı Şehir: California
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.239-242
  • Orta Doğu Teknik Üniversitesi Kuzey Kıbrıs Kampüsü Adresli: Hayır

Özet

The envelope elimination and restoration (EER) transmitter architecture is capable of providing high power efficiency without compromising linearity. This paper shows that for a wireless local area network (WLAN) application, the envelope reconstruction process modulates the supply voltage of the switching amplifier over a large dynamic range. This introduces sufficient nonlinearity to violate emission specifications. Fortunately, the EER architecture can be improved by applying envelope and phase feedback. The phase feedback architecture satisfies the emission specifications of IEEE 802.11a, while envelope feedback pro-Odes modest adjacent channel power ratio (ACPR) improvement. The impact of clipping on the ACPR and error vector magnitude (EVM) is also investigated. It is shown that for a WLAN application, a clipping of only 1dB can be tolerated before the output signal is degraded significantly.