A combination, voltage converter circuit for use within an implantable device, such as a microstimulator, uses a coil, instead of capacitors, to provide a voltage step up and step down conversion functions. The output voltage is controlled, or adjusted, through duty-cycle modulation. In accordance with...http://www.google.com.au/patents/US6856838?utm_source=gb-gplus-sharePatent US6856838 - Voltage converter for implantable microstimulator using RF-powering coil
