Method and system with current regulator biased by floating power supply

An implantable pulse generator (IPG), comprising:

• a power supply having positive and negative terminals, the negative terminal defining a reference ground;
• first and second active electrodes for delivering therapy configured to be located proximate to tissue that is associated with a target region;
• a control circuit configured to control delivery of current for a therapy between the first and second electrodes;
• a current regulator (CR) circuit connected to, and configured to control the current through, at least the first electrode during delivery of the therapy under direction of the control circuit;
• and
• a floating power supply connected across power supply terminals of the CR circuit, the CR circuit and floating power supply coupled to a floating ground node that is electrically separate from the reference ground,
• the control circuitry configured to electrically separate the floating ground node from the negative terminal of the power supply, during a discharge operation, in order that a voltage potential at the floating ground node and a voltage potential across the voltage supply terminals of the CR circuit maintain an actively emulated passive discharge (AEPD) profile during the discharge operation.