Battery monitoring means and method for an implantable tissue stimulator

摘要: A battery monitoring means for an implantable tissue stimulator in which a signal related to the internal impedance of implanted is telemetered external receiving means. More specifically, loaded by varible load until current flowing through lowers its output voltage it has predetermined relationship with respect reference voltage. The achieve directly battery. value this then In specific embodiment, variable field effect transistor (FET) connected as source follower. FET controlled operational amplifier having inputs and operates closed-loop servo system manner two input voltages are equal. other terminal shunting resistor. Thus drop across resistor drawn from, of, This