Real-time high-sensitivity impedance measurement interface for tethered BLM biosensor arrays

This paper presents a switched-capacitor (SC) current integrator circuit for impedance measurement of tethered bilayer lipid membrane (tBLM) biosensors. The circuit comprises a small number of high performance components enabling enhanced experimental flexibility and reliability. The sensitivity is improved significantly by suppressing the output offset through pseudo-differential operation, using R-C components for the reference impedance. The sensing and reference electrodes are excited with low-amplitude differential voltage pulses and the current response to membrane resistance (RM) change of the tBLM biosensor is converted to voltage by a precision, low-noise SC integrator available as a single-package IC. Tests with both electrical models and actual biosensors demonstrated that the proposed circuit operates with high sensitivity and can be used in single chip versions for low-cost and high-sensitive tBLM biosensor arrays, featuring multiple electrode sites.


Published in:
Proceedings of the 7th IEEE Sensors Conference, 650-653
Presented at:
7th IEEE Sensors Conference, Lecce, Italy, October 26-29, 2008
Year:
2008
ISBN:
978-1-4244-2580-8
Keywords:
Laboratories:




 Record created 2012-09-20, last modified 2018-03-18

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