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CORDIC-Less Digital Polar Transmitter Architecture Based on Delta-Sigma Modulator
提出一种基于Delta-Sigma调制器的无CORDIC数字极坐标发射机架构，提升功率效率和线性度。
65nm CMOS, 33.5%峰值功率附加效率, 24.2-dBm输出功率, 50-MSymbol/s 256-QAM
数字极坐标发射机Delta-Sigma调制器功率放大器线性度功率效率
▸采用Delta-Sigma调制器减少信号位数
▸使用九状态查找表直接生成AM和PM信号
▸采用1比特功率放大器提高线性度
Abstract
Conventional digital polar transmitters (TXs) su ffer
from limited power e fficiency and linearity due to the multi-
bit nature of intermediate signals. This work proposes a digital
polar TX architecture that avoids such drawbacks by reducing
the bit count of TX signals. The proposed TX oversamples and
quantizes multi-bit I/Q inputs into three-level signals using simple
delta-sigma modulators (DSMs), followed by a nine-state lookup
table (LUT) to directly generate amplitude modulation (AM) and
phas