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首页> 外文期刊>IEEE transactions on biomedical circuits and systems >A Low-Power Blocking-Capacitor-Free Charge-Balanced Electrode-Stimulator Chip With Less Than 6 nA DC Error for 1-mA Full-Scale Stimulation
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A Low-Power Blocking-Capacitor-Free Charge-Balanced Electrode-Stimulator Chip With Less Than 6 nA DC Error for 1-mA Full-Scale Stimulation

机译：低功耗，无阻塞电容，无电荷平衡的电极激励器芯片，DC误差小于6nA，可进行1mA满量程激励

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摘要

Large dc blocking capacitors are a bottleneck in reducing the size and cost of neural implants. We describe an electrode-stimulator chip that removes the need for large dc blocking capacitors in neural implants by achieving precise charge-balanced stimulation with <6 nA of dc error. For cochlear implant patients, this is well below the industry''s safety limit of 25 nA. Charge balance is achieved by dynamic current balancing to reduce the mismatch between the positive and negative phases of current to 0.4%, followed by a shorting phase of at least 1 ms between current pulses to further reduce the charge error. On +6 and -9 V rails in a 0.7-mum AMI high voltage process, the power consumption of a single channel of this chip is 47 muW when biasing power is shared by 16 channels.
机译：大型隔直电容器是减小神经植入物尺寸和成本的瓶颈。我们描述了一种电极刺激器芯片，该芯片通过实现精确的电荷平衡刺激（小于6 nA dc误差）而消除了神经植入物中对大型dc阻断电容器的需求。对于人工耳蜗患者，这远低于行业的25 nA安全极限。通过动态电流平衡将电流的正负相位之间的失配降低到0.4％，然后在电流脉冲之间至少短路1 ms，以进一步减小充电误差，从而实现电荷平衡。在0.7微米AMI高电压工艺中，在+6和-9 V电压轨上，当偏置电源由16个通道共享时，该芯片单个通道的功耗为47μW。

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