Abstract
A bidirectional neural interface analog front-end IC with both stimulation and recording functions is implemented using 0.18-µm standard CMOS process. The proposed IC is comprised of a bipolar biphasic neural stimulator using a transistor-stacked current-mirror driver to achieve good current matching performance in stimulation mode and low-voltage capacitive feedback neural amplifiers for recording mode. In order to save die area, high-voltage isolation switches are embedded within the stimulator core to protect the low-voltage recording circuits from damage. Despite using a low-voltage process, the stimulator is able to deliver up to 1mA current through 10kΩ load using 12.8V supply voltage and the recording amplifier uses 0.8V supply voltage while consuming 1µA of current. The complete IC occupies 0.29mm2 of die area and can be applied for various multi electrode array interface bidirectional neural SoCs in medical implant devices.
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