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Limited By:	Subject = Power amplifier (PA);

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Displaying Results 1 - 4 of 4 on page 1 of 1

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1-b Observation for Direct-Learning-Based Digital Predistortion of RF Power Amplifiers (2017)

Wang, Haoyu; Li, Gang; Zhou, Chongbin; Zhu, Anding; et al.

1-b Observation for Direct-Learning-Based Digital Predistortion of RF Power Amplifiers (2017)

Wang, Haoyu; Li, Gang; Zhou, Chongbin; Zhu, Anding; et al.

Abstract:

In this paper, we propose a low-cost data acquisition approach for model extraction of digital predistortion (DPD) of RF power amplifiers. The proposed approach utilizes only 1-bit resolution analog-to-digital converters (ADCs) in the observation path to digitize the error signal between the input and output signals. The DPD coefficients are then estimated based on the direct learning architecture using the measured signs of the error signal. The proposed solution is proved to be feasible in theory and the experimental results show that the proposed algorithm achieves equivalent performance as that using the conventional method. Replacing high resolution ADCs with 1- bit comparators in the feedback path can dramatically reduce the power consumption and cost of the DPD system. The 1-bit solution also makes DPD become practically implementable in future broadband systems since it is relatively straightforward to achieve an ultra-high sampling speed in data conversion by using only sim...

http://hdl.handle.net/10197/8381

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A Single Envelope Modulator-Based Envelope-Tracking Structure for Multiple-Input and Multiple-Output Wireless Transmitters (2017)

Yu, Chao; Zhu, Anding

A Single Envelope Modulator-Based Envelope-Tracking Structure for Multiple-Input and Multiple-Output Wireless Transmitters (2017)

Yu, Chao; Zhu, Anding

Abstract:

A single envelope modulator-based envelope tracking (ET) power amplifier (PA) structure with a related digital predistortion (DPD) technique for multiple-input and multiple-output (MIMO) wireless transmitters is presented in this paper. By generating a common tracking envelope, only one envelope modulator is employed for controlling supply voltage of the RF PAs in all branches in the system, which dramatically reduces the system implementation cost. Due to the structurechange, additional distortion is introduced, and it is difficult to directly compensate by using the conventional DPD because the tracking envelope is no longer the same as the RF envelope and thus the MIMO ET PA becomes a two-input and one-output system. To resolve this problem, in this paper we propose a novel DPD technique in which the PA input and output data are reconstructed into multiple data subsets according to variations of the tracking envelope. It converts the 2-to-1 mapping into multiple 1-to-1 ones, wher...

http://hdl.handle.net/10197/8644

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Dual-loop Model Extraction for Digital Predistortion of Wideband RF Power Amplifiers (2017)

Guan, Lei; Zhu, Anding

Dual-loop Model Extraction for Digital Predistortion of Wideband RF Power Amplifiers (2017)

Guan, Lei; Zhu, Anding

Abstract:

A dual-loop parameter characterization structure is proposed in order to improve the accuracy of the model extraction in digital predistortion systems. In this concept, a model reference loop is used in conjunction with a model inverse structure for fine tuning the model parameters. This model extraction process does not increase much of the complexity of system implementation but experimental results show that linearization performance can be significantly improved by employing the proposed structure for wideband RF power amplifiers.
Science Foundation Ireland

http://hdl.handle.net/10197/8647

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Highly Efficient Broadband Continuous Inverse Class-F Power Amplifier Design Using Modified Elliptic Low-Pass Filtering Matching Network (2017)

Yang, Mengsu; Xia, Jing; Guo, Yan; Zhu, Anding

Highly Efficient Broadband Continuous Inverse Class-F Power Amplifier Design Using Modified Elliptic Low-Pass Filtering Matching Network (2017)

Yang, Mengsu; Xia, Jing; Guo, Yan; Zhu, Anding

Abstract:

This paper proposes a design approach for a broadband and high-efficiency continuous inverse Class-F (CCF−1) power amplifier (PA) based on a modified elliptic low-pass filtering (LPF) matching network (MN). From theoretical and practical perspectives, the importance of a swift impedance transition from the higher end of the fundamental frequency band to the lower end of the second harmonic band is discussed, when designing a broadband single-mode PA. After being compared with widely used Chebyshev LPF MNs, a modified elliptic LPF MN, which provides a sharp roll-off, is utilized to provide the required rapid transition. A step-by-step design procedure of the proposed modified elliptic LPF MN is presented. Experimental results show that a high-efficiency CCF−1 PA is realized from 1.35 to 2.5 GHz (fractional bandwidth = 60%) with measured drain efficiency of 68%–82% and output power of 41.1–42.5 dBm. When stimulated by a 20-MHz LTE signal with an average output power of approximately 3...

http://hdl.handle.net/10197/8388

Displaying Results 1 - 4 of 4 on page 1 of 1

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