期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 48, 期 10, 页码 2478-2493出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2013.2272849
关键词
Extracellular recording; implantable wireless SoC; mixed-signal FIR filters; multi-channel neural recording; neural recording SoC
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
A system-on-chip (SoC) neural recording interface with 64 channels, 64 16-tap programmable mixed-signal FIR filters and a fully integrated 915 MHz OOK/FSK PLL-based wireless transmitter is presented. Each recording channel has a fully differential amplifier with 54 dB gain and utilizes a tunable low-distortion subthreshold MOS-resistor to reject DC offsets with an input-referred noise of 6.5 mu V and a CMRR of 75 dB. Each channel contains a modified 8-bit SAR ADC with an ENOB of 7.8-bits and can provide analog-digital multiplication by modifying the the sampling phase of the ADC. It is used in conjunction with 12-bit digital adders and registers to implement 64 programmable transposed FIR filters. The 915 MHz FSK/OOK transmitter offers data rates up to 1.5 Mbps and a maximum output power of 0 dBm. The 4x3 mm(2) chip fabricated in a 0.13 mu m CMOS process dissipates 5.03 mW from a 1.2 V supply. Experimental measurements characterize the electrical performance of the wireless SoC. In vivo measurement results from freely moving rats are also presented.
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