A bidirectional neural interface CMOS analog front-end IC with embedded isolation switch for implantable devices. (December 2016)

• Record Type: Journal Article
• Authors: Abdi, Alfian; Cha, Hyouk-Kyu
• Is Part Of: Microelectronics journal. Volume 58(2016)
• Page Start: 70
• Page End: 75
• Publication Date: 2016-12
• Subjects: CMOS Analog front-end -- Neural stimulator -- Neural recording amplifier -- Isolation switch -- Implantable device -- High voltage; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2016.10.013
• Languages: English
• ISSNs: 0959-8324

Abstract

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 1 mA current through 10 kΩ load using 12.8 V supply voltage and the recording amplifier uses 0.8 V supply voltage while consuming 1 µA of current. The complete IC occupies 0.29 mm 2 of die area and can be applied for various multi electrode array interface bidirectional neural SoCs in medical implant devices.