Saturated Power Amplifier Optimized for Efficiency Using Self-Generated Harmonic Current and Voltage
SCIE
SCOPUS
- Title
- Saturated Power Amplifier Optimized for Efficiency Using Self-Generated Harmonic Current and Voltage
- Authors
- Jungjoon Kim; Kim, J; Junghwan Moon; Jungwhan Son; Ildu Kim; Seunghoon Jee; Kim, B
- Date Issued
- 2011-08
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Abstract
- A saturated power amplifier (PA) optimized for efficiency is described. As a PA is driven into saturated operation, the current source of the device generates a large third harmonic current, which creates a quasi-rectangular current waveform. The large nonlinear output capacitor of the transistor generates a second harmonic voltage with a very small third harmonic component. The second harmonic voltage is in-phase with the fundamental voltage, making a half-sine wave voltage waveform with voltage peaking. These waveforms are similar to those of a class F. The fundamental load at the intrinsic device is resistive with the output capacitance tuned out, which is identical to the class F case. However, the required harmonic impedances are just larger than the impedance levels of the output capacitance for both the second and third harmonics. Therefore, the circuit topology is similar to that of a class E amplifier, which is very simple. The PA implemented using a GaN HEMT delivers the expected good performance using the simple circuit topology.
- Keywords
- Efficiency; load-pull simulation; nonlinear capacitance; power amplifier (PA); saturation; CDMA BASE-STATION; CLASS-F; PREDISTORTION TECHNIQUE; DOHERTY AMPLIFIER; DESIGN; MICROWAVE; RF
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17146
- DOI
- 10.1109/TMTT.2011.2155665
- ISSN
- 0018-9480
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 59, no. 8, page. 2049 - 2058, 2011-08
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