Three-band high-efficiency modulator for envelope tracking power amplifier using class-B push-pull amplifiers

2012 ◽  
Author(s):  
Jiafeng Zhou ◽  
Kevin Morris ◽  
Gavin Watkins ◽  
Keiichi Yamaguchi
Keyword(s):  
Power Amplifier ◽  
High Efficiency ◽  
Envelope Tracking ◽  
Class B

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

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1312 ◽  
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.

High efficiency envelope tracking power amplifier with very low quiescent power for 20 MHz LTE

2011 ◽  
Author(s):  
Muhammad Hassan ◽  
Myoungbo Kwak ◽  
Vincent W. Leung ◽  
Chin Hsia ◽  
Jonmei J. Yan ◽  
...  
Keyword(s):  
Power Amplifier ◽  
High Efficiency ◽  
Envelope Tracking

High-efficiency inverse class-E power amplifier with envelope tracking technique

2013 ◽  
Vol 55 (4) ◽  
pp. 866-869 ◽  
Author(s):  
Sang-Ho Kam ◽  
Oh-Seung Kwon ◽  
Mun-Woo Lee ◽  
Yoon-Ha Jeong
Keyword(s):  
Power Amplifier ◽  
High Efficiency ◽  
Envelope Tracking ◽  
Tracking Technique ◽  
Class E
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