51% Efficient 50W Envelope Tracking Broadband RF Power Amplifier for 6MHz Bandwidth OFDM
51% Efficient 50W Envelope Tracking Broadband RF Power Amplifier for 6MHz Bandwidth OFDM
- Author(s): G.T. Watkins ; J. Zhou ; K. Morris ; K. Yamaguchi
- DOI: 10.1049/ic.2013.0236
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- Author(s): G.T. Watkins ; J. Zhou ; K. Morris ; K. Yamaguchi Source: 1st Annual Active and Passive RF Devices Seminar, 2013 p. 15 – 18
- Conference: 1st Annual Active and Passive RF Devices Seminar
- DOI: 10.1049/ic.2013.0236
- ISBN: 978-1-84919-793-9
- Location: Glasgow, UK
- Conference date: 29 Oct. 2013
- Format: PDF
A high efficiency envelope tracking RF power amplifier is described capable of reproducing a 6MHz bandwidth OFDM signal at 50W output power. The modulator uses the split frequency architecture with a switched mode power supply for the low frequency envelope content and a class 1.5G amplifier for the high frequency. Whereas conventional class G amplifiers switch both the positive and negative supply voltages, class 1.5G only switches the positive supply, resulting in 69% envelope modulator efficiency at 71.4W output power. When combined with a broadband class E RF amplifier, up to 51.3% efficiency could be achieved and 52.5% when envelope elimination and restoration was used. Both results are at 50W output power. Up to 8dB PAPR is reproduced under these conditions.
Inspec keywords: OFDM modulation; radiofrequency power amplifiers; switched mode power supplies; wideband amplifiers
Subjects: Modulation and coding methods; Amplifiers; Microwave circuits and devices; Power electronics, supply and supervisory circuits
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