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Design Considerations for a Direct Digitally Modulated WLAN Transmitter With Integrated Phase Path and Dynamic Impedance Modulation Lu Y e, Member , IEEE,J i a s h uC h e n, Member , IEEE
一款65纳米全集成WLAN 802.11g数字调制极性发射机，采用动态阻抗调制提升效率。
16.8 dBm平均功率，28-dB EVM，24.5%漏极效率，22% PAE，19.3%系统效率，247-mW功耗
WLAN数字调制极性发射机动态阻抗调制开环架构
▸动态阻抗调制技术：通过动态调整输出阻抗匹配网络，显著提高功率放大器在回退功率下的效率（PAE达22%），解决了传统WLAN发射机在低功率时效率骤降的问题。
▸开环架构实现高带宽相位调制：采用无反馈的开环结构直接调制相位，支持802.11g标准的高带宽需求（200MHz偏移时噪声底-125dBm/Hz），避免了闭环系统的稳定性限制。
▸全集成基带数字滤波：将数字滤波器完全集成在65nm CMOS芯片中，减少外部元件需求，系统总功耗仅247mW，同时实现28dB EVM的高线性度。
▸混合供电设计：创新性采用1.2V/1V双电压供电策略，优化不同模块的功耗分配（如数字电路1.2V，射频模块1V），提升整体系统效率至19.3%。
Abstract
A 65-nm digitally modulated polar TX for WLAN 802.11g is fully integrated along with baseband digital filtering. The TX employs dynamic impedance modulation to improve efficiency at back-off powers. High-bandwidth phase modulation is achieved ef ficiently with an open-loop architecture. Operating from 1.2-V/1-V supplies, the TX delivers 16.8 dBm average power at 28-dB EVM with 24.5% drain ef ficiency, 22% PAE, 19.3% system ef ficiency, and 247-mW power c onsumption including the entire on-chip TX chain; the noise floor is 125 dBm/Hz at 200-MHz offset without external filtering.