Envelope-Tracking Supply Modulator with Trellis Search-Based Switching and 160MHz Capability

Envelope tracking (ET) is in wide use to raise the efficiencies of PAs. We report on the realization of a new envelope-tracking supply modulator (ETSM). A hybrid amplifier (HA) is commonly used, which, in effect, partitions the envelope bandwidth into a low and high subband. An efficient switching b...

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Bibliographic Details
Main Authors: Leng, Weiyu, Abidi, Asad, Mundlapudi, Sraavan, Darabi, Hooman, Chowdhury, Debopriyo, Afsahi, Ali, Li, Sida
Format: Conference Proceeding
Language:English
Subjects:
Application specific integrated circuits
Baseband
Buck converters
Conferences
Modulation
Operational amplifiers
Switches
Online Access:Request full text
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Summary:Envelope tracking (ET) is in wide use to raise the efficiencies of PAs. We report on the realization of a new envelope-tracking supply modulator (ETSM). A hybrid amplifier (HA) is commonly used, which, in effect, partitions the envelope bandwidth into a low and high subband. An efficient switching buck converter tracks the low band that contains most of the load current. In parallel, an op amp with a Class-AB output stage supplies the current in the high band. Feedback on the op amp servos the total current to the envelope waveform extracted from the baseband modulator (Fig. 1).
ISSN:2152-3630
DOI:10.1109/CICC51472.2021.9431477