Browsing by Author "Kuo, Liang-Ting"

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A CMOS Power-Efficient Low-Noise Current-Mode Front-End Amplifier for Neural Signal Recording
(2013-04-01)
Wu, Chung-Yu
;
Chen, Wei-Ming
;
Kuo, Liang-Ting
;
電子工程學系及電子研究所
;
生醫電子轉譯研究中心
In this paper, a new current-mode front-end amplifier (CMFEA) for neural signal recording systems is proposed. In the proposed CMFEA, a current-mode preamplifier with an active feedback loop operated at very low frequency is designed as the first gain stage to bypass any dc offset current generated by the electrode-tissue interface and to achieve a low high-pass cutoff frequency below 0.5 Hz. No reset signal or ultra-large pseudo resistor is required. The current-mode preamplifier has low dc operation current to enhance low-noise performance and decrease power consumption. A programmable current gain stage is adopted to provide adjustable gain for adaptive signal scaling. A following current-mode filter is designed to adjust the low-pass cutoff frequency for different neural signals. The proposed CMFEA is designed and fabricated in 0.18-mu m CMOS technology and the area of the core circuit is 0.076 mm(2). The measured high-pass cutoff frequency is as low as 0.3 Hz and the low-pass cutoff frequency is adjustable from 1 kHz to 10 kHz. The measured maximum current gain is 55.9 dB. The measured input-referred current noise density is 153fA/root Hz, and the power consumption is 13 mu W at 1-V power supply. The fabricated CMFEA has been successfully applied to the animal test for recording the seizure ECoG of Long-Evan rats.
A Low-Power Current-Mode Front-End Acquisition System for Biopotential Signal Recording
(2012)
Chen, Wei-Ming
;
Kuo, Liang-Ting
;
Wu, Chung-Yu
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, a new current-mode front-end amplifier for biopotential signal recording system is proposed. A current-mode preamplifier incorporates with an active feedback loop to bypass any dc current generated by tissues is designed as the first stage. A programmable gain stage and a current-mode filter are designed to adjust both gain and the low-pass cutoff frequency, respectively. The current-mode front-end amplifier is designed and fabricated in 0.18-mu m CMOS technology. The measured maximum current gain is 55.9 dB. The high-pass cutoff frequency can achieve as low as 0.3Hz and the low-pass cutoff frequency can be adjusted from 1 KHz to 10 KHz. The measured input-referred noise is 153 fA/ root Hz, and the power consumption is 13 mu W at 1-V power supply.