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
This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to firstname.lastname@example.org.
By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
- non linear distortion
- power amplifiers