Abstract
Envelope modulators for wideband and high- power envelope tracking or envelope elimination and restoration amplifiers are usually realized by combing a switching stage and a linear stage. The efficiency and bandwidth of the modulator is mainly limited by the linear stage. This paper proposes a method to improve the performance of the linear stage by adding another stage. The third stage is a push-pull amplifier biased in class-B mode. The push-pull amplifier can achieve a peak efficiency of 76%, and well above 60% over the envelope frequencies from 1MHz to 20MHz. By adding this push-pull amplifier, the three-band modulator can achieve a peak efficiency of 81% and an effective efficiency of 73% for 10MHz and 20MHz LTE signals with 30W output power. The linearity of the push-pull amplifier and the three-band modulator has been evaluated. The three-band modulator has also been tested by driving a class-E amplifier at 2.06GHz to validate the design
| Original language | English |
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| Title of host publication | European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 42nd European Microwave Conference, EuMC 2012 |
| Pages | 124-127 |
| Number of pages | 4 |
| Publication status | Published - 2012 |
| Event | 2012 42nd European Microwave Conference, EuMC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012 - Amsterdam, Netherlands Duration: 29 Oct 2012 → 1 Nov 2012 |
Conference
| Conference | 2012 42nd European Microwave Conference, EuMC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012 |
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| Country/Territory | Netherlands |
| City | Amsterdam |
| Period | 29/10/12 → 1/11/12 |
Keywords
- class-B
- class-E
- envelope elimination and restoration
- envelope modulator
- Envelope tracking
- PAE
- power amplifiers
- push-pull
- SMPS