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An improved reconfigurable Doherty power amplifier (DPA) structure with extended bandwidth is presented. A traditional DPA structure is often used to expand the output power back-off (OBO) range by using three transistors, and the peaking amplifiers work in the same frequency band. In this modified structure, the carrier amplifier works in the whole frequency band off₁–f₃, and two peaking amplifiers work inf₁–f₂andf₂–f₃, respectively (f₁ < f₂ < f₃). In addition, switches are applied in power divider and power combining networks in order to switch peaking amplifier between frequency bands. A 1.8–3.4-GHz DPA has been demonstrated utilizing such a modified structure, and the frequency band is divided into two parts, which are 1.8–2.7 GHz and 2.7–3.4 GHz. The measured results show that 7.2–11.2 dB of saturated gain, 42.2–43.9 dBm of peaking output power, 45%–62.3% and 36.7%–48.5% of drain efficiency at peaking power levels and 6-dB OBO are delivered.
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Jia et al. (2019) studied this question.
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