Machine-Learning Assisted Optimisation of Free-Parameters of a Dual-Input Power Amplifier for Wideband Applications

This paper presents an auto-tuning approach for dual-input power amplifiers using a combination of global optimisation search algorithms and adaptive linearisation in the optimisation of a multiple-input power amplifier. The objective is to exploit the extra degrees of freedom provided by dual-input topologies to enhance the power efficiency figures along wide signal bandwidths and high peak-to-average power ratio values, while being compliant with the linearity requirements. By using heuristic search global optimisation algorithms, such as the simulated annealing or the adaptive Lipschitz Optimisation, it is possible to find the best parameter configuration for PA biasing, signal calibration, and digital predistortion linearisation to help mitigating the inherent trade-off between linearity and power efficiency. Experimental results using a load-modulated balanced amplifier as device-under-test showed that after properly tuning the selected free-parameters it was possible to maximise the power efficiency when considering long-term evolution signals with different bandwidths. For example, a carrier aggregated a long-term evolution signal with up to 200 MHz instantaneous bandwidth and a peak-to-average power ratio greater than 10 dB, and was amplified with a mean output power around 33 dBm and 22.2% of mean power efficiency while meeting the in-band (error vector magnitude lower than 1%) and out-of-band (adjacent channel leakage ratio lower than −45 dBc) linearity requirements.

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The Advanced Peak Cancellation Implement Method for OFDM Signals in CMMB

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.380-384.3538 ◽

2013 ◽

Vol 380-384 ◽

pp. 3538-3541

Author(s):

Qian Hui Liu ◽

Jian Wang

Keyword(s):

Low Power ◽

Power Amplifier ◽

Power Efficiency ◽

Average Power ◽

Reduction Technique ◽

High Peak ◽

Papr Reduction ◽

Power Ratio ◽

Comparative Performance ◽

Ofdm Signals

High peak-to-average power ratio (PAPR) is one of the main disadvantages for OFDM signals, which will always result in low power efficiency of power amplifier. The peak cancellation method is a powerful PAPR reduction technique. In this paper, the advanced peak cancellation implement method (APC) is proposed for OFDM signals. Extensive simulations demonstrate that in comparison with the conversational peak cancellation implement method, the APC is more suitable for OFDM signals due to less iteration and comparative performance.

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A Wide-Band High-Gain Doherty Power Amplifier With Class-AB HEMT Amplifiers

10.21203/rs.3.rs-1120058/v1 ◽

2021 ◽

Author(s):

Pouya Jahanian ◽

Azadeh Norouzi Kangarshahi

Keyword(s):

Power Amplifier ◽

Transmission Lines ◽

Average Power ◽

Wide Band ◽

High Gain ◽

Input Power ◽

Power Ratio ◽

Class Ab ◽

Power Added Efficiency ◽

Doherty Power Amplifier

Abstract In this paper, an attempt has been made to design a Doherty power amplifier (DPA) with high-gain and wide-band. For this purpose, two peak amplifiers are used to improve the performance of the main amplifier. Main and auxiliary amplifiers with the same structure to the class-AB type and by using micro-strip lines in place of input/output and load matching networks, transmission lines and inductors of drain and gate, that minimize the losses in the DPA. The current DPA is implemented with GaN_HEMT_CLF1G0530_100v transistor and Rogers4003 substrate, which for 1GHz frequency in 0.5-1.5GHz bandwidth will be able to be at P-1dB point (this point, input power as 30dBm and output power as 47.98dBm) increase Drain efficiency and Power added efficiency (PAE) to 81.95% and 80.73%, respectively. The DPA helps to expand the back-off region and extend the linearity region, so the Peak to average power ratio (PAPR) will be 5.21dB and the Adjacent channel power ratio (ACPR) as 58.7dBc. A gain of 17.06-17.92dB was also obtained, which is significant compared to the results of similar samples.

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Design of Broadband Linear and Efficient Power Amplifier for Long-Term Evolution Applications

IEEE Microwave and Wireless Components Letters ◽

10.1109/lmwc.2013.2283877 ◽

2013 ◽

Vol 23 (12) ◽

pp. 653-655 ◽

Cited By ~ 16

Author(s):

Chaoyi Huang ◽

Songbai He ◽

Fei You ◽

Zhebin Hu

Keyword(s):

Power Amplifier ◽

Long Term Evolution ◽

Term Evolution ◽

Efficient Power

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An envelope tracking RF power amplifier with capacitive charge pump modulator

International Journal of Microwave and Wireless Technologies ◽

10.1017/s175907871600043x ◽

2016 ◽

Vol 8 (4-5) ◽

pp. 683-690 ◽

Cited By ~ 2

Author(s):

Gavin Tomas Watkins ◽

Konstantinos Mimis

Keyword(s):

Power Amplifier ◽

Supply Voltage ◽

Average Power ◽

Charge Pump ◽

Power Ratio ◽

Rf Power ◽

Envelope Tracking ◽

Rf Power Amplifier ◽

3Gpp Long Term Evolution

An envelope tracking (ET) radio frequency (RF) power amplifier (PA) is described intended for handsets and applications where a large number of PAs are needed. Instead of the usual split frequency architecture, a linear tracking charge pump structure is proposed. This allows the supply voltage of an RF PA to increase during the peaks of a high peak-to-average power ratio signal. When combined with an LDMOS RF PA, 42.9% efficiency was achieved at 31.3 dBm output power (POUT) when amplifying a 5 MHz bandwidth 8 dB PAPR 3rd Generation Partnership Project (3GPP) long term evolution signal. The first channel adjacent power ratio (ACPR) without digital pre-distortion was −30.4 dBc, meeting the 3GPP handset emission mask. The ACPR could be improved to −32.5 dBc by adopting a curved envelope shaping function at a reduced efficiency of 38.9%.

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Simulation on PAPR Suppression Algorithm for Multicarrier System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.596.794 ◽

2014 ◽

Vol 596 ◽

pp. 794-798

Author(s):

Rui Zhang ◽

Zhi Bin Zeng

Keyword(s):

Power Amplifier ◽

Power Efficiency ◽

Average Power ◽

Power Ratio ◽

Error Vector Magnitude ◽

Crest Factor ◽

Multicarrier System ◽

Crest Factor Reduction ◽

Small Distortion ◽

Vector Magnitude

The main disadvantage of multicarrier system is the high peak-to-average power ratio which can easily result in significant cut-the-top distortion of power amplifier. However, the power efficiency of power amplifier will be reduced by power back-off technology. Therefore, crest factor reduction is important in reducing the peak-to-average power ratio of multicarrier system and improving the efficiency of power amplifier. The peak-to-average power ratio can be effectively reduced with small distortion by the algorithm of crest factor reduction based on peak cancellation. And the performance of peak-to-average power ratio is better with the same error vector magnitude.

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