Abstract
This paper presents the design of an integrated current-controlled oscillator (CCO) based readout front-end for neurochemical sensing applications. The readout front-end chip is implemented in 65 nm CMOS technology and occupies an area of 0.059 mm2. The proposed design supports an input current range of 1.2 μA (±600 nA) and can also be configured to support wider current range. The CCO-based structure utilized in this design results in noise averaging of the detected neurochemical input signal due to its inherent ΔΣfirst-order noise shaping and anti-alias filtering characteristics. Thus, the prototype chip achieves a current resolution of 100 pA and can detect dopamine concentrations as small as 10 μMol based on measured data from novel diamond-like carbon electrodes. In addition, the digital codes obtained from the readout front-end attain a signal-to-noise (SNR) of 82 dB and linearity limited effective-number-of-bits (ENOB) of 8 at full current range input, without employing any calibration or linearization techniques. The proposed read-out front-end consumes 33.7 μW of power in continuous operation.
Original language | English |
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Title of host publication | ISCAS 2016 - IEEE International Symposium on Circuits and Systems |
Publisher | IEEE |
Pages | 514-517 |
Number of pages | 4 |
ISBN (Electronic) | 9781479953400, 978-1-4799-5341-7 |
ISBN (Print) | 978-1-4799-5342-4 |
DOIs | |
Publication status | Published - 11 Aug 2016 |
MoE publication type | A4 Article in a conference publication |
Event | IEEE International Symposium on Circuits and Systems - Montreal, Canada Duration: 22 May 2016 → 25 May 2016 http://iscas2016.org/ |
Publication series
Name | IEEE International Symposium on Circuits and Systems |
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Publisher | IEEE |
ISSN (Print) | 0271-4302 |
ISSN (Electronic) | 2158-1525 |
Conference
Conference | IEEE International Symposium on Circuits and Systems |
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Abbreviated title | ISCAS |
Country/Territory | Canada |
City | Montreal |
Period | 22/05/2016 → 25/05/2016 |
Internet address |
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