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 provides 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 1 dB can be tolerated before the output signal is degraded significantly
|Translated title of the contribution||Improved EER Transmitters for WLAN|
|Title of host publication||RAWCON 2006 San Diego|
|Place of Publication||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||239 - 242|
|Publication status||Published - Jan 2006|
|Event||IEEE Radio and Wireless Symposium (RAWCON) - San Diego, United States|
Duration: 1 Jan 2006 → …
|Conference||IEEE Radio and Wireless Symposium (RAWCON)|
|Period||1/01/06 → …|
Bibliographical noteConference Organiser: IEEE
Rose publication type: Conference contribution
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- non linear distortion
- power amplifiers