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Bio-potential detection is important for bio-medical diagnostics and research. Bio-potentials are generally weak (muV) with high offsets (100 mV level). Low noise processing is critical to extract the signal. In this paper, we report the design of a single-chip CMOS bio-potential detector. The design uses chopping to suppress the low-frequency noise in CMOS amplifiers. The strong offset is removed...
Imaging sensors are being used as data acquisition systems in new biomedical applications. These applications require wide dynamic range (WDR), high linearity and high signal-to-noise ratio (SNR), which cannot be met simultaneously by existing CMOS imaging sensors. This paper introduces a new activity-triggered WDR CMOS imaging sensor with very low distortion. The new WDR pixel includes self-resetting...
In this paper, a micropower current sample-and-hold front-end is designed for weak current bio-medical applications in a 0.35-mum standard CMOS process. The design reduces the distortion of the current-mode sample-and-hold stage by exploiting the exponential I-V relationship of weakly-inverted MOS transistors. The design and optimization process for the stage is introduced in the paper. With the optimized...
In this paper, a micropower current sample- and-hold front-end is designed for weak current bio-medical applications in a 0.35-mum standard CMOS process. The design reduces the distortion of the current-mode sample-and-hold stage by exploiting the exponential I-V relationship of weakly-inverted MOS transistors. The design and optimization process for the stage is introduced in the paper. With the...
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