Current generation architecture for an implantable stimulator device including distributor circuitry for sending an amplitude-scaled current to digital-to-analog converters at the electrodes

A pulse generator, comprising:

• a plurality of electrode nodes, each electrode node configured to be coupled to an electrode configured to contact a patient's tissue;
• a first digital-to-analog converter (DAC) configured to receive first digital data specifying a magnitude of a total anodic current amplitude to be produced at the electrode nodes, and to produce a first current with a magnitude that is a function of the total anodic current amplitude;
• a first distributor circuit configured to receive the first current, and to produce a plurality of second currents each with a magnitude that is a function of the magnitude of the first current;
• and
• a plurality of first current sources each configured to receive a different one of the second currents, wherein each of the first current sources is configured when selected to produce an anodic stimulation current to only a corresponding different one of the electrode nodes, wherein each of the anodic stimulation currents has a magnitude that is a function of the magnitude of the received second current.