Bumman Kim

TL;DR: This paper represents an analog predistortion linearizer for the high power amplifier with low memory effect, which comprises the fundamental path and the cuber and quintic generating circuits, whose amplitudes and phases can be controlled independently.

TL;DR: In this article, a dielectric resonator is coupled with a microstrip line, which is arranged in the fluid substrate membrane so that it can be coupled with the resonator to reduce the conductivity loss by lengthening the distance between the supporting substrate in the higher layer and the microstrip lines in the lower layer.

TL;DR: In this paper, an equivalent high impedance transmission-line section is suggested, which consists mainly of a pair of coupled-line sections with two shorts and two identical open stubs are added and conventional design equations of even and odd-mode impedances are modified based on the fact that the modified design equations have the linear combinations of conventional ones.

TL;DR: In this paper, an envelope-tracking power amplifier (ET PA) was proposed to reduce the far-out spurious emission domain of a 10-MHz bandwidth and 6.5-dB peak-to-average power ratio long term evolution signal.

TL;DR: In this paper, the existence of resistance fluctuation 1/f noise was verified by a simple comparison of collector current noise spectra with different base terminations, and it was found that, at a high emitter-base forward bias, the resistance fluctuations became dominant for shorted base-emitter termination, but the internal 1 /f noise dominant for open base.