Envelope tracking amplification with reduced slew-rate and bandwidth envelopes
2012
This paper presents an Envelope Tracking Pow-
er Amplifier whose architecture includes a Hybrid Envelope
Amplifier (HEA) and an algorithm to adapt the envelope’s
characteristics to the HEA’s limitations. The HEA attempts to
combine the high efficiency of a switched amplifier with the wide
band capabilities of a linear amplifier. A modified Slew Rate (SR)
reduction algorithm cope with the bandwidth and SR limitations
of the HEA. On the other hand, the non-linearities introduced
by this Envelope Amplifier (EA) and by the dynamic supply are
compensated using Digital Pre-Distortion. Results show that these
non-linearities are compensable and that the architecture offers
higher efficiency figures compared to the conventional linear EA
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