PROJECT TITLE :

Label-Free CMOS Bio Sensor With On-Chip Noise Reduction Scheme for Real-Time Quantitative Monitoring of Biomolecules

ABSTRACT:

We present a label-free CMOS field-effect transistor sensing array to detect the surface potential change affected by the negative charge in DNA molecules for real-time monitoring and quantification. The proposed CMOS bio sensor includes a new sensing pixel architecture implemented with correlated double sampling for reducing offset fixed pattern noise and $1/{rm f}$ noise of the sensing devices. We incorporated non-surface binding detection which allows real-time continuous monitoring of DNA concentrations without immobilizing them on the sensing surface. Various concentrations of 19-bp oligonucleotides solution can be discriminated using the prototype device fabricated in 1-$mu{rm m}$ double-poly double-metal standard CMOS process. The detection limit was measured as 1.1 ${rm ng}/mu {rm l}$ with a dynamic range of 40 dB and the transient response time was measured less than 20 seconds.


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