A novel mode switching power management system IC design for implantable biomedical instrumentations

A novel power management system with mode switching that widely applies to implantable biomedical devices is presented. Controlling the power transceiver output, monitor and simultaneously have special applications in the power path, are some of its major functions. Furthermore, a new temperature sensor and a temperature feedback regulated charger were designed for long term monitoring and small temperature variations. It also includes a system-on-enable (SOE) circuit and power feedback to increase system stability and accuracy. Moreover, constant power on the novel multi-level comparator was developed to reduce power and area consumption at the same time. The system also boasts a novel drug driver circuitry for implantable glucose biosensing applications. The whole system was fabricated in a TSMC 0.35μm 2P4M 3.3/5V CMOS technology it occupies a small area of 2.382 × 2.374 mm (core size = 2.200 × 1.086 mm) and only dissipated 36.3mW of power. The transistors were designed in moderate inversion region to arrive at high performance and low power consumption. An in-depth analysis of the proposed system has been undertaken, and experimental results match the circuit simulations.