Efficiency enhancement of burst mode transmitters by RF energy recovery

Seebacher, David; Bösch, Wolfgang; Singerl, Peter; Schuberth, Christian

doi:10.1109/prime.2013.6603147

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2014

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“…This problem can be solved by removing the isolator as depicted in Figure 1b and integrating the filter into the matching network [4][5][6][7][8]. The reflections of the filter are now used to achieve efficiency enhancement [4][5][6][7][9][10][11][12][13]. All these methods have in common that they use BB PWM to drive the PA and the following BPF.…”

Section: Introductionmentioning

confidence: 99%

Equivalent load impedance of pulse width modulation excited band pass filters

Seebacher

Singerl

Schuberth

et al. 2014

Int J RF and Microwave Comp Aid Eng

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Many efficiency enhancement concepts for power amplifiers (PAs) rely on pulse width modulation in combination with direct filter connection. Direct connection of bandpass filters results in load modulation for the PA. Therefore, the resulting equivalent impedances, respectively, load trajectories, are important for efficient operation. This article presents analytical equations to calculate these equivalent load impedances. The equations are parameterized with two impedance values making them independent of the filter structure. Based on the presented equations a PA design properly taking the load modulation into account can be done. This is shown based on a design example of a biphase energy recovery transmitter, verifying the general validity of the equations. V C 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:164-172, 2015.

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