A single-input dual-output 13.56 MHz CMOS AC–DC converter with comparator-driven rectifiers for implantable devices

• A highly efficient single-input, dual-output AC–DC converter is implemented for wireless power transfer in implantable devices using the 0.18-µm CMOS process.
• The proposed AC–DC converter consists of three rectifiers with cross-coupled NMOS transistors and comparator-driven PMOS transistors, providing 2.2 V and 1.1 V DC outputs current.
• The comparator block is comprised of two comparators connected in a latched configuration for faster response.
• The peak measured power conversion efficiency is 79.5% at 13.56 MHz operation.

A highly efficient single-input, dual-output AC–DC converter for wireless power transfer in implantable devices is implemented using the 0.18-µm CMOS process. The proposed AC–DC converter, consisting of three rectifiers with cross-coupled NMOS transistors and comparator-driven PMOS transistors, achieves up to 79.5% power conversion efficiency at 13.56 MHz operation frequency in order to provide dual outputs of 1.2 V and 2.2 V DC voltages along with 6.2 mA and 22.6 mA of current, respectively, to the implant device from a single RF input. The designed IC consumes a core die area of 0.18 mm2.

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