A C-less ASK demodulator for implantable neural interfacing chips

Various implantable micro-stimulators have been proposed for clinical applications in recent years. Most of the no-battery implanted devices can be powered by a transcutaneous magnetic coupling, which basically utilizes an external transmitter coil to power and communicate with the implanted device. Reducing the chip area of the implanted device is the key to any field application. We propose a C-less (no capacitor) area-saving ASK demodulator. The power regulator design is another task to conquer because of the low-efficient RF induced power. Therefore, a complete power regulator supplying a stable 3.3V VDD is also presented.