Generalized Hybrid Continuous Mode for Designing Broadband Power Amplifiers

2020 ◽  
Vol 29 (15) ◽  
pp. 2050236
Author(s):  
Decheng Gan ◽  
Weimin Shi ◽  
Muhammad Furqan Haider
Keyword(s):  
Power Amplifier ◽  
Power Amplifiers ◽  
Drain Current ◽  
Experimental Results ◽  
Continuous Mode ◽  
Current Waveform ◽  
Class Ab ◽  
Saturation Power ◽  
Class B ◽  
Continuous Working

It has been widely validated that continuous working modes are powerful theories for designing broadband power amplifier (BPA). Theoretically, the conduction angle of all continuous-mode power amplifiers (PAs) is 180∘ (class-B-biased). However, in practice, these PAs are always biased in class-AB condition. Thus, continuous-mode PAs biased in class-AB condition should be researched. This paper generalizes the theory of hybrid continuous mode (HCM) for implementing broadband power amplifiers. The intrinsic drain current waveform of HCM biased above the pinch-off point (conduction angle is larger than 180∘) is first derived. Then, the impedance space of the generalized HCM (class-AB-biased) is explored and analyzed. The conclusion is that the generalized HCM possesses a shifted fundamental impedance space along with the enlargement of conduction angle. For validating the proposed theory, a broadband PA working over 1.6–3.0[Formula: see text]GHz is implemented. Experimental results indicate that the designed BPA achieves a saturation power of 40.3–42.7[Formula: see text]dBm and a drain efficiency of 64.3–74.4%.

Extended Inverse Class-F Continuum for Designing Broadband Power Amplifier

2020 ◽  
pp. 2150015
Author(s):  
Decheng Gan ◽  
Weimin Shi
Keyword(s):  
Power Amplifier ◽  
Experimental Results ◽  
Current Waveform ◽  
Saturation Power ◽  
Continuous Inverse ◽  
Class F

The impedance space of the continuous inverse class-F power amplifier (PA) is extended in this paper. Traditionally, for extending impedance space, a reactive term is introduced into the current waveform of the continuous inverse class-F PA. In this paper, two reactive terms are introduced into the current and voltage waveforms simultaneously. The proposed method results in an expansive impedance space for designing broadband continuous inverse class-F PAs. For validating the proposed theory, a broadband PA working over 1.2–4.0[Formula: see text]GHz is designed and fabricated. Experimental results indicate that the fabricated broadband PA delivers a saturation power of 40.2–42.8[Formula: see text]dBm and a drain efficiency of 50.7–69%.

scholarly journals Prelinearized Class-B Power Amplifier for Piezoelectric Transducers and Portable Ultrasound Systems

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 287 ◽  
Author(s):  
Hojong Choi
Keyword(s):  
Power Amplifier ◽  
Power Amplifiers ◽  
Heat Dissipation ◽  
Piezoelectric Transducers ◽  
Battery Life ◽  
Portable Ultrasound ◽  
Class A ◽  
Class B ◽  
Cooling Fans ◽  
Pulse Echo

Portable ultrasound systems typically suffer from unwanted heat and limited battery life, resulting in reduced system performance or the applicable number of piezoelectric transducer elements. This can be a bottleneck in widely used portable ultrasound systems. Class-A power amplifiers are typically used in portable ultrasound systems. However, unwanted heat dissipation needs to be reduced by using large cooling fans and heat pipe structures. To reduce unwanted heat, class-B power amplifiers may be a possible solution. However, the non-linearity of class-B power amplifiers could limit their integration with piezoelectric transducers because non-linearity in the high-voltage output of the power amplifiers deteriorates the sensitivity of portable ultrasound systems. To improve the linearity of the power amplifier, we developed prelinearized class-B power amplifiers for piezoelectric transducers and portable ultrasound systems. To verify our proposed method, we compared the performances of class-B and prelinearized class-B power amplifiers in their pulse-echo responses. Therefore, prelinearized class-B power amplifiers are a possible solution to produce better echo signal performance in piezoelectric transducers and portable ultrasound systems.

scholarly journals The Nonlinear Drain–Source Capacitance Effect on Continuous-Mode Class-B/J Power Amplifiers

2019 ◽  
Vol 67 (7) ◽  
pp. 2741-2747 ◽  
Author(s):  
Zulhazmi A. Mokhti ◽  
Jonathan Lees ◽  
Cedric Cassan ◽  
Alexander Alt ◽  
Paul J. Tasker
Keyword(s):  
Power Amplifiers ◽  
Continuous Mode ◽  
Capacitance Effect ◽  
Class B

A 5.8 GHz class-AB power amplifier with 25.4 dBm saturation power and 29.7% PAE

2017 ◽  
Vol 60 (4) ◽  
Author(s):  
Chuan Qin ◽  
Lei Zhang ◽  
Li Zhang ◽  
Yan Wang ◽  
Zhiping Yu
Keyword(s):  
Power Amplifier ◽  
Class Ab ◽  
Saturation Power

Research on the Performance of 3-State Power Amplifiers for Magnetic Bearings

2013 ◽  
Vol 389 ◽  
pp. 245-250
Author(s):  
Zhi Li Li ◽  
Kai Zhang ◽  
Xing Jian Dai
Keyword(s):  
Power Amplifier ◽  
Power Amplifiers ◽  
Current Control ◽  
Experimental Results ◽  
Control Mode ◽  
Current Sensor ◽  
Performance Difference ◽  
Actual Use ◽  
Current Sensors ◽  
Current Ripples

The performance of the power amplifier is closely related to their hardware components and current control modes. The work was focused on comparison of the experimental results based on different current sensors and the application of two different current control modes for 3-state amplifiers. When the same control mode was used, three kind of current sensors were tested and the corresponding amplifier current ripples were measured. Experimental results shown that when using a faster current sensor, the amplifier achieved smaller current ripples. Then a 3-state PWM current control mode and a Sample-Hold current control mode were compared based on the power amplifier circuit with the same hardware components. The performance difference in the experiments were studied and explained. The 3-state PWM power amplifier could achieve a better performance in actual use.

A High Efficiency CMOS Power Amplfieir with a Diode Linearizer and Voltage Combining Transformers

2011 ◽  
Vol 110-116 ◽  
pp. 5500-5504
Author(s):  
Ki Jin Kim ◽  
Tae Ho Lim ◽  
S.H. Park ◽  
K. H. Ahn
Keyword(s):  
Power Amplifier ◽  
Insertion Loss ◽  
High Efficiency ◽  
Cmos Technology ◽  
High Current ◽  
Class Ab ◽  
Power Added Efficiency ◽  
Supply Condition ◽  
Saturation Power ◽  
Low Insertion Loss

This paper proposes a high efficiency power amplifier with a diode linearizer and voltage combining transformers in a standard 0.13-μm TSMC CMOS technology. The 3-D simulated transformer adopts multi-finger architecture which provides low insertion loss and allows high current capacity on the transformer. With the 4 differentially cascaded connected multi-finger transformers, the amplifier delivers more than 1W output power under 1.8 V supply condition. To enhance linearity of the power amplifier, the diode configuration bias circuit is used in this paper. With all integration of transformers, balun, diode bias circuits and same 4 diff-amps, the prototype Class AB Power Amplifier shows 32dBm saturation power at 2.4 GHz. Due to the diode linearizer the output P1dB is 30.8 dBm with 28 % Power Added Efficiency.

High efficiency continuous mode RF power amplifier based on second and third harmonic manipulation

2020 ◽  
pp. 1-11
Author(s):  
Firas M. Ali ◽  
Mahmuod H. Al-Muifraje ◽  
Thamir R. Saeed
Keyword(s):  
Power Amplifier ◽  
Mobile Communications ◽  
Maximum Efficiency ◽  
Harmonic Load ◽  
High Electron ◽  
Continuous Mode ◽  
Rf Power ◽  
Third Harmonic ◽  
Rf Power Amplifier ◽  
Class B

Abstract Continuous mode class-J radio-frequency (RF) power amplifier is a promising technique that extends the operating bandwidth of the conventional class-B power amplifier. However, the maximum theoretical efficiency is limited to that of the class-B power amplifier. In this paper, an enhanced mode of operation for the class-J power amplifier is proposed by incorporating a third harmonic voltage component to produce an optimum waveform for maximizing the fundamental voltage component and thereby to increase the drain efficiency and introduce a new design space. A detailed derivation for the necessary relations of output power, drain efficiency, and the required harmonic load impedances is provided, showing a significant improvement in theoretical maximum efficiency from 78.5 to 89.8%. In order to confirm the developed analytic approach, a 10 W prototype amplifier model was designed and fabricated to operate within the global system for mobile communications (GSM) frequency band 850–950 MHz using a commercial GaN power high electron mobility transistor (HEMT). The experimental results have indicated that the drain efficiency of the circuit varies from 68 to 80% within the desired band.

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