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A wideband GaN Doherty power amplifier (DPA) for 4G/LTE-Advanced base stations is presented. To break the inherent narrow band limitation of conventional DPA, a frequency dependency compensating circuit and a modified λ/4 inverter incorporating package parasitic elements are proposed. Measured DPA achieves 45.9–50.2 % drain efficiency with −50 dBc ACLR at 3.0–3.6 GHz under 20 MHz LTE signal after...
In this paper, we report a fully analog three-way sequential power amplifiers (SPA) using 10W GaN HEMTs. The proposed three-way SPA delivers Psat of 39∼40 dBm over 2.45–2.8 GHz covering a 15.4% fractional bandwidth. The three-way SPA includes a 2:1:1 multi-way splitter, a carrier amplifier, two peaking amplifiers, and a 7:1.5:1.5 combiner for power combining. The measured three-way SPA shows 41% to...
Green and flexible digital transmitter is envisioned as the evolving trend for future cellular base station, which is required to operate with multi-standard and multi-band radio signals. To energy efficiently amplify the spectrum-efficient modulated signals with high peak-to-average power ratio (PAPR>10 dB) is challenging. Compared with traditional analog solutions using Doherty Power Amplifier...
In this paper, we report a two-way sequential power amplifier (SPA) using GaN HEMTs. The proposed fully analog SPA delivers Psat of approximately 40dBm over 2–3 GHz covering 40% fractional bandwidth. The design consists of a 3dB input coupler, a main amplifier, a peak amplifier, and a 10dB output coupler for power combining. After proper designing and optimizing these critical wideband couplers in...
This work presents a new efficient multi-level intermediate frequency pulse width modulation (ML-IFPWM) power coding algorithm for switch-mode power amplifier. The merits of high power coding efficiency with distortion correction function are demonstrated by a FPGA implemented digital front end. Measurement results have shown power coding efficiency greater than 45%. To our knowledge, this is the...
In this work, for the first time we propose a multi-level intermediate frequency pulse width modulation (ML-IFPWM) power coding approach to generate a high speed pulse train as input of GHz class-S switch-mode PA in the digital-RF transmitter. The key feature of a high power coding efficiency of 68.5% from a 5-level digitally implemented discrete-time (DT)-PWM quantizer encoding 20-MHz LTE signal...
In this paper, a novel supply modulator for envelope tracking power amplifier was presented, which boosts operation bandwidth capability to tracking up to LTE 60MHz by utilizing GaN MOSFET and compatible with feed forward loop to linearize the modulator for wideband, realizing high efficiency trading off linearity as well.
In this paper, a novel supply modulator for envelope tracking power amplifier was presented, which boosts operation bandwidth capability to tracking up to LTE 60MHz by utilizing GaN MOSFET and compatible with feed forward loop to linearize the modulator for wideband, realizing high efficiency trading off linearity as well.
In this paper, a novel supply modulator for envelope tracking power amplifier was presented, which boosts operation bandwidth capability to tracking up to LTE 60MHz by utilizing GaN MOSFET and compatible with feed forward loop to linearize the modulator for wideband, realizing high efficiency trading off linearity as well.
In this paper, a novel RF circuit design concept, namely, Partitioning Design Approach (PDA) is proposed. In comparison with the conventional RF circuit design approach, it is aimed to accomplish the complex RF circuit design tasks in a straightforward way. As a demonstrator, one class-AB RF power amplifier (PA) was designed at the centre frequency of 2.14 GHz using AlGaAs/GaAs HEMT technology. Finally,...
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