Load-Modulated Balanced Amplifiers

Technology #11637

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Overview of the Load‐Modulated Balanced Amplifiers: (1) PD LMBA and (2) Reconfigurable Asymmetrical LMBA.
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Researchers
Kenle Chen, Ph.D.
Yuchen Cao
Haifeng Lyu
Patent Protection

US Patent Pending

Key Points

  • Load-modulation power amplifier platforms provide maximized efficiency over the extended power back-off range
  • Ability to achieve unlimited operational bandwidth
  • Architectures exhibit ideal solutions for current and future energy-efficiency, multi-band, and multi-mode radio transmitters

Abstract

The University of Central Florida has invented two kinds of load-modulated balanced amplifiers:

  • Pseudo‐Doherty Load-Modulated Balanced Amplifier—This invention is a load-modulation power amplifier platform, named pseudo‐Doherty load modulated balanced amplifier (PD-LMBA). The power amplifier (PA) is the most power-consuming module in any wireless platform, and it predominantly influences the system features, including power consumption, energy efficiency, temperature and bandwidth. Based on a special combination of control amplifier (carrier) and balanced amplifier (peaking) together with proper phase and amplitude controls, an optimal load‐modulation behavior can be achieved for PD‐LMBA, leading to maximized efficiency overextended power back‐off range. Meanwhile, with the phase control method, unlimited bandwidth of this load modulation PA is achieved. This architecture exhibits an ideal solution for the current and future energy‐efficiency, multi‐band, and multi‐mode radio transmitters.
  • Reconfigurable Asymmetrical Load Modulation Balanced Amplifier—This invention is an extension of the Pseudo‐Doherty Load Modulated Balanced Amplifier invention. It discloses a new active load‐modulation platform for high‐efficiency power amplification, named asymmetrical load modulated balanced amplifier (ALMBA). Two asymmetrical amplifiers coupled quadratically are load- modulated by a control amplifier (CA). With the proper setting of phase, amplitude, and turn‐on sequence of three sub‐amplifiers, a hybrid load modulation of the overall power amplifier (PA) is achievable, leading to maximally enhanced efficiency over extended dynamic power range. Moreover, with the phase control method and reconfigurable biasing scheme, the unlimited bandwidth of this load modulation amplifier can be maintained from regular LMBA. This architecture exhibits an ideal solution for the current and future energy‐efficiency, multi‐band, and multi‐mode radio transmitters.

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