In this paper, a CMOS active rectifier having high power conversion efficiency (PCE) for a wide output load range has been designed for wirelessly powered biomedical applications. Mathematical analysis is presented to evaluate optimum design conditions to achieve high PCE. Adaptively biased fast and slow comparators are used in addition to the main comparator to eliminate the ON and OFF delays associated with the comparator and buffer chain. The proposed comparator design uses both halves of ac input in tandem for obtaining a precise output. A voltage-mode switching is used to reduce static power consumption of the control circuit. The design performs reliably over process, voltage, and temperature (PVT) variations. Simulation results show that the proposed rectifier can deliver a maximum power of 69.8 mW, while the comparator and the digital blocks consume only 1.5 % of total power. A peak PCE of 93.5 % with 240 Ω loading and a peak voltage conversion ratio (VCR) of 96.7 % at 10 kΩ loading have been obtained.

在本文中，针对无线生物医学应用设计了具有高功率转换效率（PCE），适用于宽输出负载范围的CMOS有源整流器。进行了数学分析，以评估实现高PCE的最佳设计条件。除主比较器外，还使用自适应偏置的快速和慢速比较器，以消除与比较器和缓冲区链相关的ON和OFF延迟。拟议的比较器设计将交流输入的两半串联使用以获得精确的输出。电压模式切换用于减少控制电路的静态功耗。该设计可在整个过程，电压和温度（PVT）变化中可靠地执行。仿真结果表明，所提出的整流器可以提供69.8 mW的最大功率，占总功率的百分比。在240Ω负载下的峰值PCE为93.5 ％，在10kΩ负载下的峰值电压转换率（VCR）为96.7 ％。