This letter presents a modified Doherty power amplifier (DPA) combining network with wide bandwidth (BW) and high power utilization factor (PUF). For the first time, the impact of the excessive phase dispersion of matching networks on the performance of conventional broadband DPA is analytically revealed. For dispersion compensation, an optimized adaptive combining load is introduced to enhance the achievable DPA BW and PUF. For verification, a 42-dBm equal-cell DPA is prototyped to cover 1.4–2.55 GHz. Measurement results indicate that, over the prescribed frequency range, a PUF of over 0.95, back-off efficiency (6 dB) of 48%–58%, and saturation efficiency of 62%–74% can be achieved. Moreover, under WCDMA excitation, the adjacent channel leakage ratio (ACLR) was found to be better than −32 dBc with average efficiency of over 45% without applying digital predistortion techniques.

中文翻译：

---

频散多赫蒂功率放大器的带宽增强

这封信介绍了一种改进的 Doherty 功率放大器 (DPA)，将网络与宽带宽 (BW) 和高功率利用率 (PUF) 结合起来。首次分析揭示了匹配网络的过度相位色散对传统宽带 DPA 性能的影响。对于色散补偿，引入了优化的自适应合并负载以增强可实现的 DPA BW 和 PUF。为了验证，42-dBm 等单元 DPA 被原型化以覆盖 1.4–2.55 GHz。测量结果表明，在规定的频率范围内，PUF 可以达到 0.95 以上，回退效率（6 dB）为 48%–58%，饱和效率为 62%–74%。此外，在 WCDMA 激励下，