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Stimulation signal generator for an implantable device

  • US 6,690,974 B2
  • Filed: 09/11/2001
  • Issued: 02/10/2004
  • Est. Priority Date: 04/05/2000
  • Status: Expired due to Term
First Claim
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1. A neurostimulation system for treating a disorder in a brain of a patient, comprising:

  • a stimulation subsystem adapted to apply an electrical stimulation signal to neural tissue of the patient; and

    a plurality of electrodes including a first electrode and a second electrode, each in electrical communication with the stimulation subsystem;

    wherein the stimulation subsystem includes a stimulation signal generator adapted to deliver a controlled electrical current from a stimulation signal input through a stimulation load between the first electrode and the second electrode; and

    wherein the stimulation signal generator includes a programmable current digital-to-analog converter in series with the stimulation load; and

    wherein the programmable current digital-to-analog converter comprises a programmable resistor in series with the stimulation load, a reference voltage source providing a reference voltage, and a current controller adapted to match a voltage at an upstream end of the programmable resistor to the reference voltage.

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