Goran N. Marnfeldt,Philip L. Weiss,Pujitha Weerakoon,David M. Wagenbach,Emanuel Feldman,Kiran K. Gururaj
申请号：
US15695984
公开号：
US20180071511A1
申请日:
2017.09.05
申请国别(地区):
US
年份:
2018
代理人:
摘要：
Digital-to-analog converter (DAC) circuitry for providing currents at electrodes of an Implantable Pulse Generator (IPG) is disclosed. The DAC circuitry includes at least one PDAC for sourcing current to the electrodes, and at least one NDAC for sinking current from the electrodes. The PDACs are powered with power supplies VH (the compliance voltage) and Vssh in a high power domain, and the NDACs are powered with power supplies Vcc and ground in a low power domain. VH may change during IPG operation, and Vssh preferably also changes with a fixed difference with respect to VH. Digital control signals to the PDACs are formed (and possibly converted into) the high power domain, and transistors used to build the PDACs are biased in the high power domain, and thus may also change with VH. This permits transistors in the PDACs and NDACs to be made from normal low-voltage logic transistors.
