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A High-Resolution Low-Power Incremental \Sigma \Delta ADC With Extended Range for Biosensor Arrays

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6 Author(s)
Agah, A. ; Center for Integrated Syst., Stanford Univ., Stanford, CA, USA ; Vleugels, K. ; Griffin, Peter B. ; Ronaghi, M.
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A calibration-free, high-resolution analog-to-digital converter designed for a bioluminescence sensor array employs incremental sigma-delta (ΣΔ) modulation to combine the advantages of oversampling with an input multiplexing capability. The resolution of incremental ΣΔ modulators can be improved significantly by means of a technique similar to extended counting. In the approach proposed in this paper, analog-to-digital conversion is accomplished with a two-step process in which the residual error from a second-order incremental ΣΔ modulator is encoded using a successive approximation ADC. By this means it is possible to achieve enhanced resolution and improved static linearity while maintaining a one-to-one mapping between individual input and output samples. An experimental implementation of the proposed modulator has been integrated in a 0.18-μm CMOS technology. Operating from a 1.8-V supply, it achieves a dynamic range of 90.1 dB and a peak signal-to-noise and distortion ratio (SNDR) of 86.3 dB at a conversion rate of 1 MSample/s, with 38.1-mW power consumption.

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Solid-State Circuits, IEEE Journal of  (Volume:45 ,  Issue: 6 )