Abstract
In recent years, devoted researches of implantable biomedical devices have been studied from modern medicine, such as Artificial Retina and Deep Brain Stimulation. Since the implanted devices operate underneath the skin for a long term, wireless power transmission systems are widely adopted. This thesis presents a wireless power transmission system with a full-wave rectifier, high power supply rejection (PSR) low dropout (LDO) regulator and a voltage feedback control system. The system can provide a stable DC source for implanted devices, and the system only need a small rectification capacitor. The proposed LDO achieves high PSR performance of -43.5 dB at 10 MHz without any external capacitor. Moreover, the power controller is also adopted in the system to feedback control the received power by adjusting resonant capacitance. It help prevent the device from being damaged by excessive power. The circuit is fabricated with the TSMC 0.18 um 1P6M CMOS process and occupies area of 0.383 mm^2. It can provide a stable output voltage of 3.3 V and load current of 5 mA at 10 MHz.