Design and analysis of rectifying and regulating rectifier with PWM and PFM modes

Neural stimulators are a key component of neural SoC designed for treating neurological disorders and closing the feedback loop in brain computer interfaces. In this work introduce a wireless power system customized to power a monolithic implantable neural (ECoG) stimulation platform which has unique power profile. For majority of time period, the stimulator is inactive and the SoC consumes minimal power (∼100 μW). During an active stimulation period, a series of 100–200 μs long pulses of high current spaced apart by 2–3 ms are transmitted. This train of pulses is repeated every 200–400 ms. During the conduction of stimulation current, the peak power requirement can vary from 25 mW (1mA@ 12 V for 50% efficient stimulator) to 1 mW (200μA@12A for 50% efficient stimulator). So, in summary the wireless power system needs to power a load which can varies from 25 mW to 100 μW within 100 μs. These necessities a system which high dynamic range with high efficiencies and fast transient response.