Continuous time input pipeline ADCs Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cr56n450j

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  • Analog-to-digital converters (ADCs) convert analog continuous time signals into discrete time, digital format. One precondition that must be met for conventional nyquist rate ADCs is that the input signal must be suitably band-limited to an input bandwidth less than the nyquist frequency. This mandates expensive anti-alias filters which contribute to system noise and distortion degradation. By choosing an OSR of 2 and adopting simple linear phase filtering techniques, significant inherent anti-alias filtering is achieved, avoiding the need for an explicit anti-alias filter in many applications. Additionally the proposed continuous time input pipeline ADC eases a number of other challenges present in conventional switched capacitor ADCs:- sampled opamp noise folding, sampling distortion, reduced ADC area, switched-capacitor pipeline ADC input loading. Chapter 2 introduces the first continuous time input pipeline ADC in the literature. This ADC, while providing significant benefits, does not provide the inherent filtering. Chapter 3 presents the first continuous time input pipeline ADC with inherent anti-alias filtering.
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