Current output architecture for an implantable stimulator device
First Claim
1. An implantable stimulator device, comprising:
- a plurality of N electrode nodes each configured to be electrically coupled to tissue to be stimulated; and
a plurality of L first stages, each first stage comprising;
a first current source configured to provide a first current of a pre-set non-adjustable magnitude, anda plurality of N first switches, wherein each one of the first switches is controllable to source the first current to a different one of the plurality of N electrode nodes.
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Abstract
Disclosed herein are current output architectures for implantable stimulator devices. Current source and sink circuitry is divided into a plurality of stages, each of which is capable via an associated switch bank of sourcing or sinking an amount of current to or from any one of the electrodes of the device. The current source circuitry is distinct from the current sink circuitry, and the two share no common circuit nodes prior to connection to the electrodes. In other words, the current source circuitry and the current sink circuitry do not share a common node other than the electrodes. Each stage is preferably formed of a current mirror for receiving a reference current and outputting a scaled version of current to that stage'"'"'s switch bank. The scalar at each stage can be set by wiring a desired number of output transistors in parallel.
30 Citations
25 Claims
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1. An implantable stimulator device, comprising:
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a plurality of N electrode nodes each configured to be electrically coupled to tissue to be stimulated; and a plurality of L first stages, each first stage comprising; a first current source configured to provide a first current of a pre-set non-adjustable magnitude, and a plurality of N first switches, wherein each one of the first switches is controllable to source the first current to a different one of the plurality of N electrode nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification