Second Harmonic Tuning for a Broadband High Effici
Post# of 17650
Posted On: 12/29/2014 12:54:37 PM
Second Harmonic Tuning for a Broadband High Efficiency GaN Power Amplifier
Qiao Ke, Tang Zongxi, University of Electronic Science and Technology of China, Chengdu, China
November 15, 2014
In modern cellular base stations, output power, efficiency and linearity are the key requirements in the design of the PA. But with the growing number of wireless services, there is an increasing demand for wideband communication systems. The narrow frequency band power amplifier cannot meet future demands for massive data transmission; so bandwidth is another important design specification.
Although very high efficiencies have been recently reported for Class-F and Class-F-1PAs,1-3 the use of harmonic traps in the load network makes the bandwidth of these amplifiers rather narrow. Some wideband switched power amplifiers have been designed, including wideband Class E PAs,4-6 but are limited by load conditions. Harmonic tuning is good for high efficiency,7-10 but is not suitable for broadband operation. If the operating band is segmented, however, we show that harmonic tuning can provide broadband performance.
An output power of at least 40 dBm and efficiency of greater than 60 percent are achieved across the operating band. The efficiency between 2.0 to 2.2 GHz and 2.55 to 2.7 GHz is better than at 2.4 GHz due to benefits of second harmonic tuning in the low and high bands. The gain is better than 12 dB in the 2.1 GHz and 2.7 GHz range, with the gain flatness less than 1.5 dB. Good agreement is achieved between the simulations and experimental results.
http://www.microwavejournal.com/articles/2338...-amplifier
Qiao Ke, Tang Zongxi, University of Electronic Science and Technology of China, Chengdu, China
November 15, 2014
In modern cellular base stations, output power, efficiency and linearity are the key requirements in the design of the PA. But with the growing number of wireless services, there is an increasing demand for wideband communication systems. The narrow frequency band power amplifier cannot meet future demands for massive data transmission; so bandwidth is another important design specification.
Although very high efficiencies have been recently reported for Class-F and Class-F-1PAs,1-3 the use of harmonic traps in the load network makes the bandwidth of these amplifiers rather narrow. Some wideband switched power amplifiers have been designed, including wideband Class E PAs,4-6 but are limited by load conditions. Harmonic tuning is good for high efficiency,7-10 but is not suitable for broadband operation. If the operating band is segmented, however, we show that harmonic tuning can provide broadband performance.
An output power of at least 40 dBm and efficiency of greater than 60 percent are achieved across the operating band. The efficiency between 2.0 to 2.2 GHz and 2.55 to 2.7 GHz is better than at 2.4 GHz due to benefits of second harmonic tuning in the low and high bands. The gain is better than 12 dB in the 2.1 GHz and 2.7 GHz range, with the gain flatness less than 1.5 dB. Good agreement is achieved between the simulations and experimental results.
http://www.microwavejournal.com/articles/2338...-amplifier
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