tailieunhanh - Biomedical Engineering Trends in Electronics Communications and Software Part 6

Tham khảo tài liệu 'biomedical engineering trends in electronics communications and software part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 190 Biomedical Engineering Trends in Electronics Communications and Software sinusoidal inputs frequencies sampled at 20kS s and 90kS s respectively. Simulation results show a SNDR of which gives an ENOB of . npu Frequrny - 105kHz nzij Frejiu e. - 305Hz 6000 IFrequeny Hz b Fig. 20. FFT-response of the SC-based ADC for small and Nyquist frequency sinusoidal inputs sampled at a 20kS s b 90kS s. 5. Conclusions This chapter have introduced the main concepts concerning to the design of ADC for biomedical interfaces where two main architectures have been studied concluding with the presentation and results of some real implementations. The chapter has studied the most important design concerns of the Successive Approximation Architecture with capacitive DACs one of the most popular ones. This architecture is very useful in a biomedical contest due to its low area and low power consumption. However the implementation of this structures can derivate some problems related to their high sensitivity to parasitic capacitances and their high area and switching energy demand especially when the resolution became higher than 8-bits. The presented example includes a 10-bit SAR ADC with a capacitive-based DAC using a Binary Weighted Array with an attenuation capacitor to reduce the size of the matrix. The importance of the parasitic capacitances effect over other non-idealities was shown by means of two different implementations one using a capacitive array with dummies an another one without them. As the first one presented more parasitic capacitances experimental results showed that its performance was more degraded than in the case of the second one implementation without dummies unless the mismatch of this latter was worse. Due to some of the drawbacks of the of the SAR architecture we have introduced in this chapter another proposal based on the Binary Search Algorithm too but using an implementation based on SC-techniques. This architecture results highly .

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