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    Nyquist-rate A/D Converters

      Pietro Andreani
     Jan 31, 2014

    This electronics presentation is about Nyquist-rate A/D Converters - The maximum frequency of operation of high-speed ADCs depends on the unity gain frequency ftech of the used process, whose value determines the maximum obtainable f Tof an op-amp (assuming we are using op-amps, which is very often the case). fT is lower than ftech by a factor α, which is at least 2-4: tech Tffα=Furthermore, it is necessary to provide enough time for the analog signals to settle, thus requiring a suitable margin between the op-amp’s fTand the clock frequency: The “time constant” of the line is roughly, and it is easy to see that it does not depend on the width of the interconnection (if larger, Cu increases and Ru decreases by the same amount). Typically, Ru Cu is in the order of a few tens of, leading to of 1ps in presence of a few hundreds of microns of interconnection. A noise pulse of 10 mV FS (e.g. caused by digital switching noise) at the crossing threshold (normalized amplitude of 0.5) results in a jitter of 10.2 fs and 35.7 fs, respectively Less steep slope, higher sensitivity to noise. If the signal V in at the input of a comparat or is not large enough, the comparator output may be undefined at the end of the latch phase error in the output code Input signal, pre-amplified during Φamp , and positive-feedback regenerated during latch even a small input results in a ”digital” outpu.

    Important Tags: Nyquist-rate A/D Converters, Free, Publish, Presentations, Electronics, Technology
    Views: 3151
    Domain: Electronics
    Category: Semiconductors

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