JSSC 2023第2期RF & Wireless40nmDAC

A Fully-Integrated Wideband Digital Polar Transmitter With 11-bit Digital-to-Pha

一款全集成宽带数字极化发射器，采用C-DAC数字相位转换器和宽带开关变压器数字功率放大器。

40nm CMOS, 1.1V, 1.5GHz, 20.1dBm峰值输出功率, 23.7%系统效率

数字极化发射器数字相位转换器CORDIC算法谐波抑制宽带功率放大器

▸归一化CORDIC算法解决PM带宽扩展问题

▸八相单元复用技术降低功耗并提高相位幅度

▸谐波抑制技术保持相位线性度

Abstract

This work presents a wideband digital polar trans- mitter (DPTX) with an integrated capacitor-digital-to-analog converter (C-DAC)-based digital-to-phase converter (DPC). A normalized CORDIC algorithm is introduced to convert the I/ Q baseband signals to a constant envelope to overcome the PM bandwidth expansion issue and avoid the amplitude modulation (AM)–phase modulation (PM) nonlinearity. In the DPC, the switched-capacitor DAC topology is employed for good linear- ity, and the eight-phase cel