Yin Ming, Ghovanloo M
Department of Electrical and Computer Engineering, NCSU, Raleigh, NC, USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2008;2008:2024-7. doi: 10.1109/IEMBS.2008.4649588.
We present a high performance wideband receiver for multichannel wireless implantable neural recording systems (WINeR) utilizing pulse width modulation of time division multiplexed (PWM-TDM) samples. The receiver consists of a 50 MHz approximately 1 GHz tunable down-converter with 75 MHz bandwidth, frequency shift keying and PWM demodulators, and a high throughput USB interface. Several IF gain stages, passive LC filters, and an FPGA-based time-to-digital converter (TDC) with time interval resolution of 428 ps have significantly enhanced the receiver performance and extended its receiving range. A 2 MB SDRAM is used as a buffer between the TDC and USB to ensure continuous throughput for the digitized raw data at data rates up to 10 Mb/s. The receiver performance is evaluated with a 6-channel WINeR transmitter, showing that the entire system input referred noise with this receiver is 9.8 and 12.7 microV(rms) at 0.5 and 3.5 m distances, respectively, which are equivalent to 8.2 and 7.9 bits of resolution at 640 ksample/s.
我们展示了一种用于多通道无线植入式神经记录系统（WINeR）的高性能宽带接收器，该接收器利用时分复用（PWM - TDM）样本的脉宽调制。该接收器由一个带宽为75 MHz、可调谐至1 GHz的50 MHz下变频器、频移键控和PWM解调器以及一个高吞吐量USB接口组成。多个中频增益级、无源LC滤波器以及基于FPGA的时间数字转换器（TDC）（时间间隔分辨率为428 ps）显著提高了接收器性能并扩展了其接收范围。一个2 MB的SDRAM用作TDC和USB之间的缓冲区，以确保在高达10 Mb/s的数据速率下，数字化原始数据能实现连续吞吐量。使用一个6通道WINeR发射器对接收器性能进行评估，结果表明，使用该接收器时，整个系统在0.5 m和3.5 m距离处的输入参考噪声分别为9.8和12.7 μV（rms），这相当于在640 ksample/s时分辨率为8.2和7.9位。
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