Abstract
This letter presents the design of a broadband power amplifier (PA) that achieves, over the 0.45-3.4-GHz frequency band, an output power between 41.5 and 44.3 dBm and a power added efficiency (PAE) higher than 54%. A four-section transformer has been adopted as the output-matching network in order to target the impedance region defined by a simplified prediction of the power and efficiency contours. The designed PA can find application in flexible hardware for 5G applications, as well as in broadband radar and countermeasure systems.
Highlights
T HE current trend for high-frequency systems in the sub6-GHz range is seeing an increased demand for flexible radios able to cover very wide ranges of frequencies
The power amplifier (PA) is one of the most affected components, since its performance has a significant impact on the overall system, and its design becomes more challenging when targeting very broad-frequency ranges
The class-J PA design shown in [1] focusses on producing low-pass and bandpass matching design rules for the output matching and the input matching, respectively, which lead to equations for determining the values of the several components
Summary
T HE current trend for high-frequency systems in the sub6-GHz range is seeing an increased demand for flexible radios able to cover very wide ranges of frequencies. A few examples of the broadband PAs with an output power higher than 10–15 W are available in the literature (see Table I). Based on the 10-W nominal packaged devices, but still able to exceed that power over the whole bandwidth, the PAs presented in [1]–[3] use different design approaches. The design in [2] is based on the observation of the optimum load trajectory versus frequency that leads to a simple matching strategy; a real-to-real impedance transformation, followed by the use of a short stub for allowing. In [5], the source-/load-pull simulations are used to identify the optimum impedance regions, followed by an optimization algorithm for the matching network design based on a figure of merit that automatically leads to the in-band equalization of performance. The measurements demonstrate an ultraoctave high-efficiency PA, with 153.2% of fractional bandwidth and power added efficiency (PAE) from 54% to 70.4%, for an output power between 14.1 and 26.9 W
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