Abstract
This paper presents a new method to design a Doherty power amplifier (DPA) with a large, high-efficiency range for 5G communication. This is through analyzing the drain-to-source capacitance (CDS) of DPAs, and adopting appropriate impedance of the peak device. A closed design process is proposed, to design the extended efficiency range DPA based on derived theories. For validation, a DPA with large efficiency range was designed and fabricated by using two equal devices. The measured results showed that the saturated output power was between 43.4 dBm and 43.7 dBm in the target band. Around 70% saturated drain efficiency is obtained with a gain of greater than 11 dB. Moreover, the obtained drain efficiency is larger than 50% at the 10 dB power back-off, when operating at 3.5 GHz. These superior performances illustrate that the implemented DPA can be applied well in 5G communication.
Highlights
With the rapid development of communication technology, the amount of data transferred worldwide is increasing significantly [1]
In this work, we are not committed to eliminating the impact of CDS on Doherty power amplifier (DPA) performance, we have developed a method to use CDS to achieve a larger output power back-off (OBO) range
DPAacircuit, circuit, DPA was was based on the circuit schematic designed in the previous section
Summary
With the rapid development of communication technology, the amount of data transferred worldwide is increasing significantly [1]. Limited spectrum resources have become extremely precious. There are many methods to improve the efficiency of spectrum transmission. Modern wireless communication signals usually adopt complex modulation methods to improve the utilization efficiency of spectrum resources [2,3]. These signals are often large peak-to-average ratio signals, and traditional power amplifiers (PAs) are not suitable for amplifying these signals [4,5]. Higher performance is required from the power amplifiers
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