In this letter, a wideband watt-level digital power amplifier (DPA) with a balance-compensated matching network is proposed for polar transmitters. The balance response of the differential to the single-ended transformer is enhanced by a series-loaded compensation capacitor, which leads to the improvement of the DPA efficiency. To verify the mechanisms, a prototype DPA is fabricated in conventional 40-nm CMOS technology. The proposed DPA operates over 1.2–2.8 GHz and exhibits a peak output power of 32.4 dBm at 2 GHz and a peak drain efficiency of 53.8% at 1.8 GHz. It supports 50-MHz 64-quadratic-amplitude modulation (QAM) with average output power ( $P_{\text {avg}}$ ) of 25.37 dBm, error vector magnitude (EVM) of −26.97 dB, adjacent channel power ratio (ACPR) of −29.61 dBc, and 10-MHz 1024-QAM with $P_{\text {avg}}$ of 22.14 dBm, EVM of −35.75 dB, and ACPR of −35.37 dBc, respectively.

中文翻译：

---

具有平衡补偿匹配网络的 1.2-2.8-GHz 32.4-dBm 数字功率放大器

在这封信中，我们为极性发射器提出了一种带有平衡补偿匹配网络的宽带瓦特级数字功率放大器 (DPA)。串联负载的补偿电容器增强了差分对单端变压器的平衡响应，从而提高了 DPA 效率。为了验证这些机制，使用传统的 40 纳米 CMOS 技术制造了原型 DPA。建议的 DPA 在 1.2–2.8 GHz 范围内运行，在 2 GHz 时的峰值输出功率为 32.4 dBm，在 1.8 GHz 时的峰值漏极效率为 53.8%。它支持具有平均输出功率 ( $P_{\text {avg}}$ ) 为 25.37 dBm，误差矢量幅度 (EVM) 为 −26.97 dB，相邻信道功率比 (ACPR) 为 −29.61 dBc，以及 10-MHz 1024-QAM 和 $P_{\text {avg}}$ 分别为 22.14 dBm、-35.75 dB 的 EVM 和 -35.37 dBc 的 ACPR。