Real time compliance voltage generation for an implantable stimulator
First Claim
1. Circuitry configured to produce a compliance voltage in an implantable stimulator device, comprising:
- a biasing circuit configured to provide a current pulse between at least one first electrode and at least one second electrode, wherein the biasing circuit is connected in series with the at least one first electrode and the at least one second electrode between a time-varying compliance voltage and a reference voltage;
a first amplifier configured to measure a first voltage across the biasing circuit continuously during the current pulse; and
regulator circuitry configured to continuously vary the compliance voltage during the current pulse in accordance with the first voltage,wherein the regulator circuitry comprises a waveform generator for producing a waveform,wherein the waveform generator receives a first optimal voltage across the biasing circuit to set a maximum amplitude of the waveform to the first optimal voltage, andwherein the first voltage is compared to the waveform to provide a gating signal to a pulse width modulation transistor in the regulatory circuitry.
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Abstract
Circuitry for generating a compliance voltage (V+) for the current sources and/or sinks in an implantable stimulator device is disclosed. The improved compliance voltage generation circuitry adjusts V+ to an optimal value in real time, even during the provision of a stimulation current. The circuitry uses amplifiers to measure the voltage drop across an active PDACs (current sources) and/or NDAC (current sinks) The measured voltages are input to a V+ regulator, which compares the measured voltage drops across the DACs to optimal values, and which feeds an optimized value for V+ back to the DACs in real time to keep the voltage drop(s) at those optimal levels during the stimulation current for efficient DAC operation.
57 Citations
18 Claims
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1. Circuitry configured to produce a compliance voltage in an implantable stimulator device, comprising:
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a biasing circuit configured to provide a current pulse between at least one first electrode and at least one second electrode, wherein the biasing circuit is connected in series with the at least one first electrode and the at least one second electrode between a time-varying compliance voltage and a reference voltage; a first amplifier configured to measure a first voltage across the biasing circuit continuously during the current pulse; and regulator circuitry configured to continuously vary the compliance voltage during the current pulse in accordance with the first voltage, wherein the regulator circuitry comprises a waveform generator for producing a waveform, wherein the waveform generator receives a first optimal voltage across the biasing circuit to set a maximum amplitude of the waveform to the first optimal voltage, and wherein the first voltage is compared to the waveform to provide a gating signal to a pulse width modulation transistor in the regulatory circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification