Abstract
In this paper, we proposed a new load modulation method to improve bandwidth and efficiency at output power back-off (OBO) of the Doherty Power Amplifier (DPA). The quarter wavelength transmission line behind the combination point of the impedance inverter was replaced with a dual-frequency matching circuit to matche the impedance value of the combination point to the load impedance in this method. The dual-frequency matching was used to compensate for the frequency dispersion effect that occurs in the traditional impedance inverter network and to a certain extent solves the bandwidth limitation of the Doherty power amplifier. To verify the proposed theory, a broadband high-efficiency power amplifier was designed and manufactured for 5G mobile communications. Measurement results show that the designed DPA is in the range of 2.4-3.7GHz, the saturated output power is above 42dBm, the saturated drain efficiency is 61.2%-68.4%, and the 6dB back-off efficiency is 49.7%-61.4%.
Highlights
In past decades, with the increasing demand for data traffic and the emergence of new radio frequency front-ends, the popularization of 5G communications has become faster and faster
MEASUREMENT RESULTS The photograph of the fabricated Doherty power amplifier (DPA) is shown in Fig.(10)
By improving the traditional load modulation network (LMN), the λ/4 transmission line after the combination point is replaced with a dualfrequency transmission line to achieve bandwidth expansion
Summary
With the increasing demand for data traffic and the emergence of new radio frequency front-ends, the popularization of 5G communications has become faster and faster In this period of a gradual transition to 5G communications, to fully tap the potential of 4G networks and protect the existing large-scale communications assets, new communications standards and models have emerged in the mobile communications system. This requires the development of new frequency bands, as well as reducing the space occupied by the RF front-end and reducing costs as much as possible [1], [2]. How to enhance the bandwidth of DPA so that DPA can continue to play an important role in 5G communication systems
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