Abstract
Power back-off performances of the modified power-combining Class-E amplifier under different amplitudemodulation schemes such as envelope elimination and restoration (EER) and envelope tracking (ET) are experimentally assessed in this paper. The modified output load network adopting three-harmonic terminations technique eliminates the need for additional lossy filtering section in the transmitter chain. Small dc-feed inductances rather than massive RF chokes as in the classic Class-E amplifier are used so as to increase the modulation bandwidth and therefore improve the linearity of the EER transmitter. High efficiency over a wide dynamic range using amplitude modulation through drain-voltage control (EER) was achieved and this agrees well with the Class-E theoretical prediction. When the PA was used within the ET scheme, an increase of average drain efficiency of as high as 40% with respect to the CW excitation was obtained for a multi-carrier input signal with 12dB peak-to-average power ratio.
| Original language | English |
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| Pages | 1-4 |
| Number of pages | 4 |
| Publication status | Published - Mar 2011 |
| Event | GEMIC - Darmstadt, Germany Duration: 01 Mar 2011 → 01 Mar 2011 |
Conference
| Conference | GEMIC |
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| Country | Germany |
| City | Darmstadt |
| Period | 01/03/2011 → 01/03/2011 |