A Broadband High-Efficiency Hybrid Continuous Inverse Power Amplifier Based on Extended Admittance Space

A novel hybrid continuous inverse power amplifier (PA) that is constituted by a continuum of PA modes from the continuous inverse class-F to the continuous inverse class-B/J is proposed, and a detailed mathematical analysis is presented. The fundamental and second harmonic admittance spaces of the hybrid PA proposed in this article are analyzed mathematically. By introducing the phase shift parameter into the current waveform formula of the hybrid continuous inverse PA, the design space of the fundamental and second harmonic admittance is expanded, further increasing the operating bandwidth. The efficiency of the amplifier under different parameter conditions is calculated. In order to verify this method, a broadband high-efficiency PA is designed and fabricated. The drain voltage and current waveforms of the amplifier are extracted for analysis. The experimental measured results show a 60.7–71.5% drain efficiency across the frequency band of 0.5–2.5 GHz (133% bandwidth), and the designed PA can obtain an 11.8–13.9 dB gain in the interesting frequency range. The measured results are confirmed to be in good agreement with theory and simulations.

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X-Band High-Efficiency Continuous Class B Power Amplifier GaN MMIC Assisted by Input Second-Harmonic Tuning

Electronics ◽

10.3390/electronics8111312 ◽

2019 ◽

Vol 8 (11) ◽

pp. 1312 ◽

Cited By ~ 1

Author(s):

Chen Jin ◽

Yuan Gao ◽

Wei Chen ◽

Jianhua Huang ◽

Zhiyu Wang ◽

...

Keyword(s):

Power Amplifier ◽

Integrated Circuit ◽

High Efficiency ◽

Second Harmonic ◽

Power Added Efficiency ◽

Optimum Load ◽

Measurement Results ◽

Class B ◽

Point To Point ◽

Output Capacitance

This paper presents a high-efficiency continuous class B power amplifier MMIC (Monolithic Microwave Integrated Circuit) from 8 GHz to 10.5 GHz, fabricated with 0.25 μm GaN-on-SiC technology. The Pedro load-line method was performed to calculate the optimum load of the GaN field-effect transistor (FET) for efficiency enhancement. Optimized by an output second-harmonic tuned network, fundamental to second-harmonic impedance, mapping was established point-to-point within a broad frequency band, which approached the classic continuous class B mode with an expanded high-efficiency bandwidth. Moreover, the contribution to the output capacitance of the FET was introduced into the output second-harmonic tuned network, which simplified the structure of the output matching network. Assisted by the second-harmonic source-pull technique, the input second-harmonic tuned network was optimized to improve the efficiency of the power amplifier over the operation band. The measurement results showed 51–59% PAE (Power Added Efficiency) and 19.8–21.2 dB power gain with a saturated power of 40.8–42.2 dBm from 8 GHz to 10.5 GHz. The size of the chip was 3.2 × 2.4 mm2.

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Design of wideband high‐efficiency power amplifier based on continuous inverse modes

International Journal of RF and Microwave Computer-Aided Engineering ◽

10.1002/mmce.22703 ◽

2021 ◽

Author(s):

Ziming Zhao ◽

Xiao‐Wei Zhu ◽

Lei Zhang

Keyword(s):

Power Amplifier ◽

High Efficiency ◽

Continuous Inverse

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A Class-J Power Amplifier Implementation for Ultrasound Device Applications

Sensors ◽

10.3390/s20082273 ◽

2020 ◽

Vol 20 (8) ◽

pp. 2273 ◽

Cited By ~ 5

Author(s):

Kiheum You ◽

Seung-Hwan Kim ◽

Hojong Choi

Keyword(s):

Power Amplifier ◽

High Efficiency ◽

Second Harmonic ◽

Signal Spectrum ◽

Electronic Components ◽

Echo Signal ◽

Ultrasonic Device ◽

Device Applications ◽

Ultrasonic Devices ◽

High Output

In ultrasonic systems, power amplifiers are one of the most important electronic components used to supply output voltages to ultrasonic devices. If ultrasonic devices have low sensitivity and limited maximum allowable voltages, it can be quite challenging to detect the echo signal in the ultrasonic system itself. Therefore, the class-J power amplifier, which can generate high output power with high efficiency, is proposed for such ultrasonic device applications. The class-J power amplifier developed has a power efficiency of 63.91% and a gain of 28.16 dB at 25 MHz and 13.52 dBm input. The pulse-echo measurement method was used to verify the performance of the electronic components used in the ultrasonic system. The echo signal appearing with the discharged high voltage signal was measured. The amplitude of the first echo signal in the measured echo signal spectrum was 4.4 V and the total-harmonic-distortion (THD), including the fundamental signal and the second harmonic, was 22.35%. The amplitude of the second echo signal was 1.08 V, and the THD, including the fundamental signal and the second harmonic, was 12.45%. These results confirm that a class-J power amplifier can supply a very high output echo signal to an ultrasonic device.

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