Doherty power amplifier (DPA) with high efficiency at the output back off is highly demanded for modern wireless communication systems to achieve data rates and reduce consumption operation costs. This paper presents a new design strategy enhancing DPA’s back-off efficiency. New called asymmetrical matching network used asymmetric operation, which helps compensate low delivered by peaking stage...

A trade-off between linearity and efficiency exists in conventional power amplifiers. The outphase amplifying concept overcomes this trade-off by enabling the use of high efficiency, non-linear power amplifiers for linear amplification. An amplitude modulated signal is first decomposed into two constant amplitude, phase modulated signals that can be amplified using two high efficiency switching...

In this paper a high efficiency PWM CMOS audio power amplifier is proposed. The original idea is based on the difference close-loop feedback technique and the difference pre-amp. Thus, we conceive a rail to rail comparator with a constant gm. This rail-to-rail PWM comparator with hysteresis architecture has been embedded in the audio power amplifier. The simulation results based on the TSMC 0.1...

The paper describes the design, realization and characterization of a set of hybrid medium-power RF power amplifiers, based on a commercial packaged GaN HEMT and developed through a low-cost microstrip process. Two different design solutions suitable for wireless applications are presented: the first, intended for a constant-envelope modulation (with reference to the GSM standard), is a Class F...

A power amplifier (PA) is a key part of the RF front-end in transmitters for a local broadband network. Today, commercial PAs are made of III-V HEMT and HBT technology with excellent results. An integrated system-on-chip power amplifier circuit using CMOS technology for cost-effective and spectrum-efficient high-speed wireless communication presents major challenges because power amplifiers hav...