DocumentCode :
3017759
Title :
A front-end circuit with active spike and LFP separation via a switched capacitor filter structure for neural recording applications
Author :
Bihr, Ulrich ; Ortmanns, Maurits
Author_Institution :
Inst. of Microelectron., Univ. of Ulm, Ulm, Germany
fYear :
2012
fDate :
20-23 May 2012
Firstpage :
2231
Lastpage :
2234
Abstract :
A fully differential front-end circuit for a neural recording system with spike and Local Field Potential (LFP) separation by means of switched capacitor (SC) filters is reported in this paper. In many neural recording chips the transmitter is the most power hungry element and defines the number of channels on a chip. With a separation of the neural signal, it is possible to reduce the data rate and so the power consumption of the transmitter without any reduction of resolution in the quantized signal. The system consists of a low-noise-amplifier (LNA), an anti-aliasing-filter with tunable gain and a corner frequency at 50kHz to enable SC circuits with a clock frequency of 100kHz. Two SC biquad filters with tunable gain and tunable corner frequency are implemented to split the spikes and the LFP from each other and to amplify the sub signals to the full swing. Both channels provide an input referred noise of 3.8μVrms in the passband and the whole front-end circuit has a power dissipation of 52μW. A prototype is fabricated in a standard 0.18μm CMOS process and tested successfully.
Keywords :
CMOS integrated circuits; biquadratic filters; data recording; neural chips; switched capacitor filters; transmitters; CMOS process; LFP separation; LNA; SC biquad filter structure; active spike; antialiasing-filter; corner frequency; data rate reduction; frequency 100 kHz; frequency 50 kHz; fully differential front-end circuit; input referred noise; local field potential separation; low-noise-amplifier; neural recording chip application; neural signal; power 52 muW; power consumption; power dissipation; power hungry element; quantized signal resolution reduction; size 0.18 mum; switched capacitor biquad filter structure; transmitter; tunable corner frequency; tunable gain; Band pass filters; Capacitors; Frequency measurement; Noise; Power demand; Transmitters; Wireless communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems (ISCAS), 2012 IEEE International Symposium on
Conference_Location :
Seoul
ISSN :
0271-4302
Print_ISBN :
978-1-4673-0218-0
Type :
conf
DOI :
10.1109/ISCAS.2012.6271735
Filename :
6271735
Link To Document :
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