A Differential Rectifier With V Compensation for High-Frequency RF Inputs.

A CMOS differential-drive bootstrap (BS) rectifier achieving an efficient dynamic threshold voltage ( V)-drop compensation at high-frequency RF inputs is proposed for small biomedical implants with wireless power transmission. A bootstrapping circuit with a dynamically controlled NMOS transistor and two capacitors is proposed to implement a dynamic V-drop compensation (DVC). The proposed bootstrapping circuit dynamically compensates the V drop of the main rectifying transistors by generating a compensation voltage only when the compensation is required, improving the power conversion efficiency (PCE) of the proposed BS rectifier.