Bumman Kim

TL;DR: In this paper, a fully matched N-way Doherty amplifier with two-, three-, and four-way structures is presented. And the linearity performance of the Doherty amplifiers is optimized for better efficiency versus linearity by a bias adjustment of the peaking amplifiers.

TL;DR: In this paper, a Doherty amplifier with uneven input drive and individual matching for the carrier and peaking cells was proposed, where higher input power is delivered to the peaking cell rather than the carrier cell for optimized linear power operation, especially for appropriate load modulation.

TL;DR: In this paper, the authors presented analytic and experimental comparisons for high-efficiency class-F and inverse-class-F amplifiers, where the analytic formula of the efficiencies, output powers, dc power dissipations and fundamental load impedances of both amplifiers were derived from the ideal current and voltage waveforms.

TL;DR: In this article, a Doherty amplifier with full load matching circuits of the carrier and peaking amplifiers at both low and high power levels is demonstrated for the first time, and the circuit elements and bias points are designed and optimized using a large-signal harmonic balance simulation to offer simultaneous improvements in linearity and efficiency.

TL;DR: An extensive review of the most up-to-date papers on microwave Doherty power amplifiers is presented, where the main applications are discussed, together with the employed semiconductor technologies.