A 2 µW 45 nV/√Hz Readout Frontend With Multiple Chopping Active-High-Pass Ripple Reduction Loop and Pseudo-Feedback DC Servo Loop

UM > Institute of Chinese Medical Sciences

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	A 2 µW 45 nV/√Hz Readout Frontend With Multiple Chopping Active-High-Pass Ripple Reduction Loop and Pseudo-Feedback DC Servo Loop
	Wu, J.; Law, M. K.; Mak, P. I.; Martins, R. P.
	2016-03-01
Source Publication	IEEE Transactions on Circuits and Systems - II
ISSN	1549-7747
Pages	351-355
Abstract	This brief presents an ultra-low-power low-noise chopped capacitively coupled instrumentation amplifier (CCIA) that is suitable for neural recording applications. An active high-pass filter is embedded in the ripple reduction loop (RRL) to suppress the residual noise and relax the capacitor size. Multiple chopping is employed to further reduce the residual output ripple due to the RRL offsets. A dc servo loop (DSL) using a 14-nA pseudofeedback amplifier is proposed to achieve a subhertz high-pass corner while using only a 15-pF on-chip capacitor. The complete CCIA is implemented in a standard 0.18-μm CMOS process. It occupies an area of 0.23 mm^2 (including the DSL) and consumes 1.7 μA from a 1.25-V supply, achieving a noise efficiency factor of 2.9 that compares favorably with the state of the art.
Keyword	Capacitively coupled instrumentation amplifier (CCIA) dc servo loop (DSL) multiple chopping neural recording front end pseudofeedback amplifier ripple reduction loop (RRL)
URL	View the original
Language	英語English
The Source to Article	PB_Publication
PUB ID	19431
Document Type	Journal article
Collection	Institute of Chinese Medical Sciences
Corresponding Author	Law, M. K.
Recommended Citation GB/T 7714	Wu, J.,Law, M. K.,Mak, P. I.,et al. A 2 µW 45 nV/√Hz Readout Frontend With Multiple Chopping Active-High-Pass Ripple Reduction Loop and Pseudo-Feedback DC Servo Loop[J]. IEEE Transactions on Circuits and Systems - II, 2016, 351-355.
APA	Wu, J.., Law, M. K.., Mak, P. I.., & Martins, R. P. (2016). A 2 µW 45 nV/√Hz Readout Frontend With Multiple Chopping Active-High-Pass Ripple Reduction Loop and Pseudo-Feedback DC Servo Loop. IEEE Transactions on Circuits and Systems - II, 351-355.
MLA	Wu, J.,et al."A 2 µW 45 nV/√Hz Readout Frontend With Multiple Chopping Active-High-Pass Ripple Reduction Loop and Pseudo-Feedback DC Servo Loop".IEEE Transactions on Circuits and Systems - II (2016):351-355.

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