Analysis and Compensation of RF Path Imbalance in LINC System

Lim, Jonggyun; Kang, Wonshil; Ku, Hyunchul

doi:10.5515/kjkiees.2010.21.8.857

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Two signal paths that form the LINC systems have unavoidable path imbalance on their gain and phase difference. Gain and phase mismatches will cause the significant deterioration in linearity of the system [11, 12]. We analyze an error vector magnitude (EVM) of the multi-tone signals considering the effect of path imbalance (GR, gain ratio between two paths; PE, phase error between two paths).…”

Section: Verificationmentioning

confidence: 99%

Design of high efficient 3-level LINC transmitter using a 9-point finite difference method

Lim

2015

Int. J. Microw. Wireless Technol.

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Design of high efficient 3-level LINC transmitter using a 9-point finite difference method jonggyun lim and hyunchul ku An efficiency of linear amplification with nonlinear components (LINC) system is degraded due to the low efficiency of a power combiner for high peak-to-average power ratio signals such as long-term evolution signal. A multi-level LINC system can be used to improve the performance of the conventional LINC system. In this paper, a novel 9-point finite difference method to determine the optimal threshold values for 3-level LINC system is suggested. Instead of solving the complicated differential equation, the proposed method can extract optimal threshold values efficiently by numerical method. The 3-level LINC system adopting the proposed scheme and dynamic biasing significantly improves the power efficiency and linear performance simultaneously. The proposed system is verified by comparing the performance of the 3-level system with those of the conventional and 2-level LINC systems.

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Section: Verificationmentioning

confidence: 99%

Design of high efficient 3-level LINC transmitter using a 9-point finite difference method

Lim

2015

Int. J. Microw. Wireless Technol.

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“…With the increase in the communication rate [1], the demand for communication capacity at the base station increases; therefore, high spectrum efficiency and high data rate orthogonal frequency division multiplexing (OFDM) signals [2] are one of the main modulation signals used today. Since OFDM signals are composed of multiple independently modulated subcarrier signals superimposed on each other, when the phases are the same, the superimposed signals tend to generate large instantaneous power peaks, resulting in a high peak-to-average power ratio (PAPR).…”

Section: Introductionmentioning

confidence: 99%

Design of Efficient Concurrent Dual-Frequency Doherty Power Amplifier Based on Step Impedance Low-Pass Filter

Li,

Xu,

Nan

et al. 2023

Electronics

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In view of the peak-to-average power ratio (PAPR) of wireless communication base stations, a Doherty power amplifier with high efficiency maintained at output power back-off (OBO) can effectively solve the problem of low efficiency of the traditional power amplifier at the point of power back-off. In this paper, we propose a method to implement a dual-frequency Doherty power amplifier (DPA) using a step-impedance low-pass filter to improve the bandwidth and efficiency of the DPA at output power back-off (OBO). Step impedance low-pass filters are used to solve the bandwidth limitations in traditional impedance converters and improve the efficiency of Doherty power amplifiers to a certain extent. In order to verify the proposed scheme, an efficient concurrent dual-band Doherty power amplifier operating at 2.0/3.5 GHz is designed and fabricated for the first range 1 (FR1) of 5G applications. In the measured results, the concurrent dual-band DPA achieves a saturated output power of 44 dBm and drain efficiency of 62% with a 6 dB back-off efficiency of 53% at 2.0 GHz and a saturated output power of 43.5 dBm and drain efficiency of 68% with a 6 dB back-off efficiency of 58% at 3.5 GHz.

show abstract

Analysis and Compensation of RF Path Imbalance in LINC System

Cited by 2 publications

References 9 publications

Design of high efficient 3-level LINC transmitter using a 9-point finite difference method

Design of high efficient 3-level LINC transmitter using a 9-point finite difference method

Design of Efficient Concurrent Dual-Frequency Doherty Power Amplifier Based on Step Impedance Low-Pass Filter

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