JSSC 2009第11期RF & Wireless0.18μm CMOSNeural Network Accelerator

High-Efﬁciency Differential-Drive CMOS Rectiﬁer for UHF RFIDs Koji Kotani Member

开发了一种用于UHF RFID的高效CMOS整流器电路，采用差分驱动结构，显著提高了功率转换效率。

67.5% PCE under 953 MHz, -12.5 dBm RF input and 10 KΩ output load

高效整流器UHF RFID差分驱动CMOS功率转换效率

▸差分驱动主动栅极偏置机制：通过交叉耦合桥式结构和差分射频输入驱动，实现了二极管连接MOS晶体管的同时低导通电阻和小反向泄漏，显著提升了功率转换效率（PCE），在953 MHz、-12.5 dBm输入和10 KΩ负载下达到67.5%的PCE，是现有技术的两倍。

▸低导通电阻和小反向泄漏：采用差分驱动机制优化了MOS晶体管的导通特性，减少了能量损耗，特别在小射频输入功率条件下表现优异，提升了整体能效。

▸多级配置以实现更高的输出电压：通过多级整流器配置，进一步提升了输出电压，适应不同应用场景的需求，扩展了RFID标签的工作范围和适用性。

▸晶体管尺寸优化：实验结果表明，根据输出负载条件存在最佳晶体管尺寸，通过优化晶体管尺寸进一步提升了功率转换效率，为设计高性能整流器提供了重要参考。

Abstract

enior Member , IEEE Abstract—A high-efﬁciency CMOS rectiﬁer circuit for UHF RFIDs was developed. The rectiﬁer has a cross-coupled bridge conﬁguration and is driven by a differential RF input. A differen- tial-drive active gate bias mechanism simultaneously enables both low ON-resistance and small reverse leakage of diode-connected MOS transistors, resulting in large power conversion efﬁciency (PCE), especially under small RF input power conditions. A test circuit of the proposed differential-dri