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1.8 W, 19 MHz envelope amplifier for envelope tracking and envelope elimination and restoration | IEEE Conference Publication | IEEE Xplore

1.8 W, 19 MHz envelope amplifier for envelope tracking and envelope elimination and restoration


Abstract:

This paper presents an efficient envelope amplifier targeted to wideband Envelope Tracking (WBET) and wide-band Envelope Elimination and Restoration (EER). The design com...Show More

Abstract:

This paper presents an efficient envelope amplifier targeted to wideband Envelope Tracking (WBET) and wide-band Envelope Elimination and Restoration (EER). The design combines a Buck DC-DC converter with wideband operational amplifier. The goal is to achieve high operating frequency with good efficiency. The paper revisits some design features like the effect of slew rate limitation of switch current, comparator hysteresis on the operation of the envelope amplifier and the effect of propagation delay of the switch loop. The designed and implemented envelope amplifier achieved a measured 1.8 W of true output power with peak efficiency of 65%. The measured 1 dB frequency response reached up to 19 MHz and the measured spurious levels with sinusoidal signal were below 48 dBc.
Published in: 2013 NORCHIP
Date of Conference: 11-12 November 2013
Date Added to IEEE Xplore: 09 January 2014
Electronic ISBN:978-1-4799-1647-4
Conference Location: Vilnius, Lithuania

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